{"id":978,"date":"2025-04-25T22:15:06","date_gmt":"2025-04-25T14:15:06","guid":{"rendered":"https:\/\/eve2333.top\/?p=978"},"modified":"2025-04-25T22:15:06","modified_gmt":"2025-04-25T14:15:06","slug":"%e5%ad%a6%e4%b9%a0%ef%bc%9a%e5%bd%bb%e5%ba%95%e7%90%86%e8%a7%a3%e9%9b%b6%e6%8b%b7%e8%b4%9d%e6%8a%80%e6%9c%afzero-copy","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=978","title":{"rendered":"\u5b66\u4e60\uff1a\u5f7b\u5e95\u7406\u89e3\u96f6\u62f7\u8d1d\u6280\u672fzero-copy"},"content":{"rendered":"\n<p>\u5b66\u4e60\u300a<strong>\u8ba1\u7b97\u673a\u5e95\u5c42\u7684\u79d8\u5bc6<\/strong>\u300b\uff0c<strong>\u611f\u8c22\u7801\u519c\u7684\u8352\u5c9b\u6c42\u751f<\/strong><\/p>\n\n\n\n<p>\u8ba1\u7b97\u673a\u5904\u7406\u7684\u4efb\u52a1\u5927\u4f53\u53ef\u4ee5\u5206\u4e3a\u4e24\u7c7b\uff1aCPU\u5bc6\u96c6\u578b\u4e0eIO\u5bc6\u96c6\u578b\u3002<\/p>\n\n\n\n<p>\u5f53\u524d\u6d41\u884c\u7684\u4e92\u8054\u7f51\u5e94\u7528\u66f4\u591a\u7684\u5c5e\u4e8eIO\u5bc6\u96c6\u578b\uff0c\u4f20\u7edf\u7684IO\u6807\u51c6\u63a5\u53e3\u90fd\u662f\u57fa\u4e8e\u6570\u636e\u62f7\u8d1d\u7684\uff0c\u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u4e3b\u8981\u5173\u6ce8\u8be5\u600e\u6837\u4ece\u6570\u636e\u62f7\u8d1d\u7684\u89d2\u5ea6\u6765\u4f18\u5316IO\u6027\u80fd\uff0c\u8ba9\u4f60\u7684\u7a0b\u5e8f\u5728IO\u6027\u80fd\u65b9\u9762\u8d76\u8d85P8\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u4e3a\u4ec0\u4e48IO\u63a5\u53e3\u8981\u57fa\u4e8e\u6570\u636e\u62f7\u8d1d\uff1f<\/strong><\/h4>\n\n\n\n<p>\u64cd\u4f5c\u7cfb\u7edf\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u7ba1\u5bb6\uff0c<strong>\u76ee\u7684\u5c31\u662f\u66f4\u52a0\u516c\u5e73\u5408\u7406\u7684\u7ed9\u5404\u4e2a\u8fdb\u7a0b\u5206\u914d\u786c\u4ef6\u8d44\u6e90<\/strong>\uff0c\u5728\u64cd\u4f5c\u7cfb\u7edf\u51fa\u73b0\u4e4b\u524d\uff0c\u7a0b\u5e8f\u5458\u9700\u8981\u76f4\u9762\u5404\u7c7b\u786c\u4ef6\uff0c\u5c31\u50cf\u8fd9\u6837\uff1aApplication&lt;--------------->Hardware<\/p>\n\n\n\n<p>\u5728\u8fd9\u4e00\u65f6\u671f\u7a0b\u5e8f\u5458\u771f\u53ef\u8c13\u638c\u63a7\u5168\u5c40\uff0c\u638c\u63a7\u5168\u5c40\u5e26\u6765\u7684\u540e\u679c\u5c31\u662f\u4f60\u9700\u8981\u638c\u63a7\u6240\u6709\u7ec6\u8282\uff0c\u8fd9\u663e\u7136\u4e0d\u5229\u4e8e\u751f\u4ea7\u529b\u7684\u91ca\u653e\u3002\u4f60\u5199c\u90fd\u7ecf\u5e38\u5fd8\u4e86delete\uff0c\u4f55\u51b5\u8fd9\u4e2a\u5462<\/p>\n\n\n\n<p>\u64cd\u4f5c\u7cfb\u7edf\u5e94\u7528\u800c\u751f\u3002\u8ba1\u7b97\u673a\u7cfb\u7edf\u5c31\u53d8\u6210\u8fd9\u6837\u4e86\uff1aApplication&lt;--->Operating System&lt;---->Hardware<\/p>\n\n\n\n<p>\u73b0\u5728\u5e94\u7528\u7a0b\u5e8f\u4e0d\u9700\u8981\u548c\u786c\u4ef6\u76f4\u63a5\u4ea4\u4e92\u4e86\uff0c\u4ec5\u4eceIO\u7684\u89d2\u5ea6\u4e0a\u770b\uff0c\u64cd\u4f5c\u7cfb\u7edf\u53d8\u6210\u4e86\u4e00\u4e2a\u7c7b\u4f3c\u8def\u7531\u5668\u7684\u89d2\u8272\uff0c\u628a\u5e94\u7528\u7a0b\u5e8f\u9012\u4ea4\u8fc7\u6765\u7684\u6570\u636e\u5206\u53d1\u5230\u5177\u4f53\u7684\u786c\u4ef6\u4e0a\u53bb\uff0c\u6216\u8005\u4ece\u786c\u4ef6\u63a5\u6536\u6570\u636e\u5e76\u5206\u53d1\u7ed9\u76f8\u5e94\u7684\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1019\" height=\"653\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590039-image.png\" alt=\"\" class=\"wp-image-980\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590039-image.png 1019w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590039-image-300x192.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590039-image-768x492.png 768w\" sizes=\"auto, (max-width: 1019px) 100vw, 1019px\" \/><\/figure>\n\n\n\n<p>\u6570\u636e\u4f20\u9012\u662f\u901a\u8fc7\u4ec0\u4e48\u5462\uff1f\u5c31\u662f\u6211\u4eec\u5e38\u8bf4\u7684buffer\uff0c\u6240\u8c13buffer\u5c31\u662f\u4e00\u5757\u53ef\u7528\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u7528\u6765\u6682\u5b58\u6570\u636e\u3002\u64cd\u4f5c\u7cfb\u7edf\u8fd9\u4e00\u4e2d\u95f4\u5546\u5bfc\u81f4\u7684\u95ee\u9898\u5c31\u662f\uff1a<strong>\u4f60\u9700\u8981\u9996\u5148\u628a\u4e1c\u897f\u4ea4\u7ed9\u64cd\u4f5c\u7cfb\u7edf\uff0c\u64cd\u4f5c\u7cfb\u7edf\u518d\u8f6c\u624b\u4ea4\u7ed9\u786c\u4ef6<\/strong>\uff0c\u8fd9\u5c31\u5fc5\u7136\u6d89\u53ca\u5230\u6570\u636e\u62f7\u8d1d\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4f20\u7edf\u7684IO\u64cd\u4f5c\u5fc5\u7136\u9700\u8981\u8fdb\u884c\u6570\u636e\u62f7\u8d1d\u7684\u539f\u56e0\u6240\u5728\uff0c\u4f60\u5728\u5927\u5b66\u8bfe\u7a0b-\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5e94\u8be5\u6709\u6240\u5370\u8c61\uff1a\u7136\u800c\u6570\u636e\u62f7\u8d1d\u662f\u6709\u6027\u80fd\u635f\u8017\u7684\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u7528\u4e00\u4e2a\u5b9e\u4f8b\u6765\u8ba9\u5927\u5bb6\u5bf9\u8be5\u95ee\u9898\u6709\u4e00\u4e2a\u66f4\u76f4\u89c2\u7684\u8ba4\u77e5\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7f51\u7edc\u670d\u52a1\u5668<\/strong><\/h4>\n\n\n\n<p>\u6d4f\u89c8\u5668\u6253\u5f00\u4e00\u4e2a\u7f51\u9875\u9700\u8981\u5f88\u591a\u6570\u636e\uff0c\u5305\u62ec\u770b\u5230\u7684\u56fe\u7247\u3001html\u6587\u4ef6\u3001css\u6587\u4ef6\u3001js\u6587\u4ef6\u7b49\u7b49\uff0c\u5f53\u6d4f\u89c8\u5668\u8bf7\u6c42\u8fd9\u7c7b\u6587\u4ef6\u65f6\u670d\u52a1\u5668\u7aef\u7684\u5de5\u4f5c\u5176\u5b9e\u662f\u975e\u5e38\u7b80\u5355\u7684\uff1a\u670d\u52a1\u5668\u53ea\u9700\u8981\u4ece\u78c1\u76d8\u4e2d\u6293\u51fa\u8be5\u6587\u4ef6\u7136\u540e\u4e22\u7ed9\u7f51\u7edc\u53d1\u9001\u51fa\u53bb\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"390\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590044-image-1024x390.png\" alt=\"\" class=\"wp-image-981\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590044-image-1024x390.png 1024w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590044-image-300x114.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590044-image-768x292.png 768w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590044-image.png 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4ee3\u7801\u57fa\u672c\u4e0a\u7c7b\u4f3c\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>read(fileDesc,&nbsp;buf,&nbsp;len);<br>write(socket,&nbsp;buf,&nbsp;len);<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e24\u6bb5\u4ee3\u7801\u975e\u5e38\u7b80\u5355\uff0c\u7b2c\u4e00\u884c\u4ee3\u7801\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\u5b58\u653e\u5728buf\u4e2d\uff0c\u7136\u540e\u5c06buf\u4e2d\u7684\u6570\u636e\u901a\u8fc7\u7f51\u7edc\u53d1\u9001\u51fa\u53bb\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\u89c2\u5bdfbuf\uff0c\u670d\u52a1\u5668\u5168\u7a0b\u6ca1\u6709\u5bf9buf\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u4efb\u4f55\u4fee\u6539\uff0cbuf\u91cc\u7684\u6570\u636e\u5728\u7528\u6237\u6001\u901b\u4e86\u4e00\u5708\u540e\u6325\u4e00\u6325\u8863\u8896\u6ca1\u6709\u5e26\u8d70\u534a\u70b9\u4e91\u5f69\u5c31\u56de\u5230\u4e86\u5185\u6838\u6001\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e24\u884c\u770b\u4f3c\u7b80\u5355\u7684\u4ee3\u7801\u5b9e\u9645\u4e0a\u5728\u5e95\u5c42\u53d1\u751f\u4e86\u4ec0\u4e48\u5462\uff1f<\/p>\n\n\n\n<p>\u7b54\u6848\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"991\" height=\"649\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590049-image.png\" alt=\"\" class=\"wp-image-982\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590049-image.png 991w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590049-image-300x196.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590049-image-768x503.png 768w\" sizes=\"auto, (max-width: 991px) 100vw, 991px\" \/><\/figure>\n\n\n\n<p>\u5728\u7a0b\u5e8f\u770b\u6765\u7b80\u5355\u7684\u4e24\u884c\u4ee3\u7801\u5728\u5e95\u5c42\u662f\u6bd4\u8f83\u590d\u6742\u7684\uff0c\u770b\u5230\u8fd9\u5f20\u56fe\u4f60\u5e94\u8be5\u771f\u5fc3\u611f\u6fc0\u64cd\u4f5c\u7cfb\u7edf\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5c31\u50cf\u4e00\u4e2a\u65e0\u6bd4\u79f0\u804c\u7684\u7ba1\u5bb6\uff0c\u66ff\u4f60\u628a\u6240\u6709\u810f\u6d3b\u7d2f\u6d3b\u90fd\u627f\u62c5\u4e0b\u6765\uff0c\u597d\u8ba9\u4f60\u60a0\u95f2\u7684\u5728\u7528\u6237\u6001\u6307\u70b9\u6c5f\u5c71\u3002<\/p>\n\n\n\n<p>\u8fd9\u7b80\u5355\u7684\u4e24\u884c\u4ee3\u7801\u6d89\u53ca\uff1a<strong>\u56db\u6b21\u6570\u636e\u62f7\u8d1d<\/strong>\u4ee5\u53ca<strong>\u56db\u6b21\u4e0a\u4e0b\u6587\u5207\u6362\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"968\" height=\"642\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590052-image.png\" alt=\"\" class=\"wp-image-983\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590052-image.png 968w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590052-image-300x199.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590052-image-768x509.png 768w\" sizes=\"auto, (max-width: 968px) 100vw, 968px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li>read\u51fd\u6570\u4f1a\u6d89\u53ca\u4e00\u6b21\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5411\u78c1\u76d8\u53d1\u8d77\u4e00\u6b21IO\u8bf7\u6c42\uff0c\u5f53\u6570\u636e\u51c6\u5907\u597d\u540e\u901a\u8fc7DMA\u6280\u672f\u628a\u6570\u636e\u62f7\u8d1d\u5230\u5185\u6838\u7684buffer\u4e2d\uff0c\u6ce8\u610f\u672c\u6b21\u6570\u636e\u62f7\u8d1d\u65e0\u9700CPU\u53c2\u4e0e\u3002<\/li>\n\n\n\n<li>\u6b64\u540e\u64cd\u4f5c\u7cfb\u7edf\u5f00\u59cb\u628a\u8fd9\u5757\u6570\u636e\u4ece\u5185\u6838\u62f7\u8d1d\u5230\u7528\u6237\u6001\u7684buffer\u4e2d\uff0c\u6b64\u65f6read()\u51fd\u6570\u8fd4\u56de\uff0c\u5e76\u4ece\u5185\u6838\u6001\u5207\u6362\u56de\u7528\u6237\u6001\uff0c\u5230\u8fd9\u65f6read(fileDesc, buf, len);\u8fd9\u884c\u4ee3\u7801\u5c31\u8fd4\u56de\u4e86\uff0cbuf\u4e2d\u88c5\u597d\u4e86\u65b0\u9c9c\u51fa\u7089\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u63a5\u4e0b\u6765send\u51fd\u6570\u518d\u6b21\u5bfc\u81f4\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u6b64\u65f6\u6570\u636e\u9700\u8981\u4ece\u7528\u6237\u6001buf\u62f7\u8d1d\u5230\u7f51\u7edc\u534f\u8bae\u5b50\u7cfb\u7edf\u7684buf\u4e2d\uff0c\u5177\u4f53\u70b9\u8be5buf\u5c5e\u4e8e\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528\u7684\u8fd9\u4e2asocket\u3002<\/li>\n\n\n\n<li>\u6b64\u540esend\u51fd\u6570\u8fd4\u56de\uff0c\u518d\u6b21\u7531\u5185\u6838\u6001\u8fd4\u56de\u5230\u7528\u6237\u6001\uff1b\u6b64\u65f6\u5728\u7a0b\u5e8f\u5458\u770b\u6765\u6570\u636e\u5df2\u7ecf\u6210\u529f\u53d1\u51fa\u53bb\u4e86\uff0c\u4f46\u5b9e\u9645\u4e0a\u6570\u636e\u53ef\u80fd\u4f9d\u7136\u505c\u7559\u5728\u5185\u6838\u4e2d\uff0c\u6b64\u540e\u7b2c\u56db\u6b21\u6570\u636ecopy\u5f00\u59cb\uff0c\u5229\u7528DMA\u6280\u672f\u628a\u6570\u636e\u4ecesocket buf\u62f7\u8d1d\u7ed9\u7f51\u5361\uff0c\u7136\u540e\u771f\u6b63\u7684\u53d1\u9001\u51fa\u53bb\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u5c31\u662f\u770b\u4f3c\u7b80\u5355\u7684\u8fd9\u4e24\u884c\u4ee3\u7801\u5728\u5e95\u5c42\u7684\u5b8c\u6574\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u8fc7\u7a0b\u6709\u4ec0\u4e48\u95ee\u9898\u5417\uff1f<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u53d1\u73b0\u95ee\u9898<\/strong><\/h4>\n\n\n\n<p>\u6709\u7684\u540c\u5b66\u80af\u5b9a\u5df2\u7ecf\u6ce8\u610f\u5230\u4e86\uff0c\u65e2\u7136\u5728\u7528\u6237\u6001\u6ca1\u6709\u5bf9\u6570\u636e\u8fdb\u884c\u4efb\u4f55\u4fee\u6539\uff0c\u90a3\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u9ebb\u70e6\u7684\u8ba9\u6570\u636e\u5728\u7528\u6237\u6001\u6765\u4e2a\u4e00\u65e5\u6e38\u5462\uff1f\u76f4\u63a5\u5728\u5185\u6838\u6001\u4ece\u78c1\u76d8\u7ed9\u5230\u7f51\u5361\u4e0d\u5c31\u53ef\u4ee5\u4e86\u5417\uff1f<\/p>\n\n\n\n<p>\u7b54\u5bf9\u4e86\uff01\u8fd9\u79cd\u4f18\u5316\u601d\u8def\u5c31\u662f\u6240\u8c13\u7684\u96f6\u62f7\u8d1d\u6280\u672f\uff0cZero Copy\u3002<\/p>\n\n\n\n<p>\u603b\u4f53\u4e0a\u6765\u770b\uff0c\u4f18\u5316\u6570\u636e\u62f7\u8d1d\u4f1a\u6709\u4ee5\u4e0b\u4e09\u4e2a\u65b9\u5411\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7528\u6237\u6001\u4e0d\u9700\u8981\u771f\u6b63\u7684\u53bb\u8bbf\u95ee\u6570\u636e\uff0c\u5c31\u50cf\u4e0a\u9762\u8fd9\u4e2a\u793a\u4f8b\uff0c\u7528\u6237\u6001\u6839\u672c\u4e0d\u9700\u8981\u77e5\u9053buf\u91cc\u9762\u88c5\u7684\u662f\u4ec0\u4e48\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u65e0\u9700\u628a\u6570\u636e\u4ece\u5185\u6838\u6001\u62f7\u8d1d\u5230\u7528\u6237\u6001\u7136\u540e\u518d\u628a\u6570\u636e\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u56de\u5185\u6838\u6001\u3002\u6570\u636e\u65e0\u9700\u7528\u6237\u6001\u611f\u77e5\uff0c\u6570\u636e\u62f7\u8d1d\u5b8c\u5168\u53d1\u751f\u5728\u5185\u6838\u6001\u3002<\/li>\n\n\n\n<li>\u5185\u6838\u6001\u4e0d\u8981\u771f\u6b63\u7684\u53bb\u8bbf\u95ee\u6570\u636e\uff0c\u7528\u6237\u6001\u7a0b\u5e8f\u53ef\u4ee5\u7ed5\u8fc7\u5185\u6838\u76f4\u63a5\u548c\u786c\u4ef6\u4ea4\u4e92\uff0c\u8fd9\u6837\u5c31\u907f\u514d\u4e86\u5185\u6838\u7684\u53c2\u4e0e\uff0c\u4ece\u800c\u51cf\u5c11\u6570\u636e\u62f7\u8d1d\u7684\u53ef\u80fd\u3002\u5185\u6838\u65e0\u9700\u611f\u77e5\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u4e0d\u5f97\u4e0d\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\uff0c\u5219\u4f18\u5316\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u6570\u636e\u7684\u4ea4\u4e92\u65b9\u5f0f\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u77e5\u9053\u4e86\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\uff0c\u6211\u4eec\u6765\u770b\u4e0b\u4e3a\u4e86\u5b9e\u73b0\u96f6\u62f7\u8d1d\uff0c\u8ba1\u7b97\u673a\u7cfb\u7edf\u4e2d\u90fd\u6709\u54ea\u4e9b\u5de7\u5999\u7684\u8bbe\u8ba1\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>mmap<\/strong><\/h4>\n\n\n\n<p>\u662f\u7684\uff0c\u5c31\u662fmmap\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u672c\u6587\u63d0\u5230\u7684\u7f51\u7edc\u670d\u52a1\u5668\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u4fee\u6539\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>buf&nbsp;=&nbsp;mmap(file,&nbsp;len);<br>write(socket,&nbsp;buf,&nbsp;len);<\/code><\/pre>\n\n\n\n<p>\u4f60\u53ef\u80fd\u4f1a\u60f3\u4ec5\u4ec5\u5c06read\u66ff\u6362\u4e3ammap\u4f1a\u6709\u4ec0\u4e48\u4f18\u5316\u5417\uff1f<\/p>\n\n\n\n<p>\u5982\u679c\u4f60\u771f\u7684\u7406\u89e3\u4e86mmap\u5c31\u4f1a\u77e5\u9053\uff0cmmap\u4ec5\u4ec5\u5c06\u6587\u4ef6\u5185\u5bb9\u6620\u5c04\u5230\u4e86\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u5e76\u6ca1\u6709\u771f\u6b63\u7684\u62f7\u8d1d\u5230\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\uff0c\u8fd9\u8282\u7701\u4e86\u4e00\u6b21\u4ece\u5185\u6838\u6001\u5230\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u3002<\/p>\n\n\n\n<p>\u540c\u6837\u7684\uff0c\u5f53\u8c03\u7528write\u65f6\u6570\u636e\u76f4\u63a5\u4ece\u5185\u6838buf\u62f7\u8d1d\u7ed9\u4e86socket buf\uff0c\u800c\u4e0d\u662f\u50cfread\/write\u65b9\u6cd5\u4e2d\u628a\u7528\u6237\u6001\u6570\u636e\u62f7\u8d1d\u7ed9socket buf\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"639\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590059-image.png\" alt=\"\" class=\"wp-image-984\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590059-image.png 989w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590059-image-300x194.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590059-image-768x496.png 768w\" sizes=\"auto, (max-width: 989px) 100vw, 989px\" \/><\/figure>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5229\u7528mmap\u6211\u4eec\u8282\u7701\u4e86\u4e00\u6b21\u6570\u636e\u62f7\u8d1d\uff0c\u4e0a\u4e0b\u6587\u5207\u6362\u4f9d\u7136\u662f\u56db\u6b21\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"981\" height=\"647\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590064-image.png\" alt=\"\" class=\"wp-image-985\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590064-image.png 981w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590064-image-300x198.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590064-image-768x507.png 768w\" sizes=\"auto, (max-width: 981px) 100vw, 981px\" \/><\/figure>\n\n\n\n<p>\u5c3d\u7ba1mmap\u53ef\u4ee5\u8282\u7701\u6570\u636e\u62f7\u8d1d\uff0c\u4f46\u7ef4\u62a4\u6587\u4ef6\u4e0e\u5730\u5740\u7a7a\u95f4\u7684\u6620\u5c04\u5173\u7cfb\u4e5f\u662f\u6709\u4ee3\u4ef7\u7684\uff0c\u9664\u975eCPU\u62f7\u8d1d\u6570\u636e\u7684\u65f6\u95f4\u8d85\u8fc7\u7ef4\u7cfb\u6620\u5c04\u5173\u7cfb\u7684\u4ee3\u4ef7\uff0c\u5426\u5219\u57fa\u4e8emmap\u7684\u7a0b\u5e8f\u6027\u80fd\u53ef\u80fd\u4e0d\u53ca\u4f20\u7edf\u7684read\/write\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u5982\u679c\u6620\u5c04\u7684\u6587\u4ef6\u88ab\u5176\u5b83\u8fdb\u7a0b\u622a\u65ad\uff0c\u5728Linux\u7cfb\u7edf\u4e0b\u4f60\u7684\u8fdb\u7a0b\u5c06\u7acb\u5373\u63a5\u6536\u5230SIGBUS\u4fe1\u53f7\uff0c\u56e0\u6b64\u8fd9\u79cd\u5f02\u5e38\u60c5\u51b5\u4e5f\u9700\u8981\u6b63\u786e\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u9664\u4e86mmap\u4e4b\u5916\uff0c\u8fd8\u6709\u5176\u5b83\u529e\u6cd5\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u96f6\u62f7\u8d1d\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>sendfile<\/strong><\/h4>\n\n\n\n<p>\u4f60\u6ca1\u6709\u770b\u9519\uff0c\u5728Linux\u7cfb\u7edf\u4e0b\u4e3a\u4e86\u89e3\u51b3\u6570\u636e\u62f7\u8d1d\u95ee\u9898\u4e13\u95e8\u8bbe\u8ba1\u4e86\u8fd9\u4e00\u7cfb\u7edf\u8c03\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><em>#include&nbsp;&lt;sys\/sendfile.h&gt;<\/em><br>ssize_t&nbsp;sendfile(int&nbsp;out_fd,&nbsp;int&nbsp;in_fd,&nbsp;off_t&nbsp;*offset,&nbsp;size_t&nbsp;count);<\/code><\/pre>\n\n\n\n<p>Windows\u4e0b\u4e5f\u6709\u4e00\u4e2a\u4f5c\u7528\u7c7b\u4f3c\u7684API\uff1aTransmitFile\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e00\u7cfb\u7edf\u8c03\u7528\u7684\u76ee\u7684\u662f\u5728\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u4e4b\u95f4\u62f7\u8d1d\u6570\u636e\uff0c\u4f46\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u6570\u636e\u62f7\u8d1d\u7684\u8fc7\u7a0b\u5b8c\u5168\u662f\u5728\u5185\u6838\u6001\u5b8c\u6210\uff0c\u56e0\u6b64\u5728\u7f51\u7edc\u670d\u52a1\u5668\u7684\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6211\u4eec\u5c06\u628a\u90a3\u4e24\u884c\u4ee3\u7801\u7b80\u5316\u4e3a\u4e00\u884c\uff0c\u4e5f\u5c31\u662f\u8c03\u7528\u8fd9\u91cc\u7684sendfile\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528sendfile\u5c06\u8282\u7701\u4e24\u6b21\u6570\u636e\u62f7\u8d1d\uff0c\u56e0\u4e3a\u6570\u636e\u65e0\u9700\u4f20\u8f93\u5230\u7528\u6237\u6001\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1017\" height=\"660\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590191-image.png\" alt=\"\" class=\"wp-image-986\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590191-image.png 1017w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590191-image-300x195.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590191-image-768x498.png 768w\" sizes=\"auto, (max-width: 1017px) 100vw, 1017px\" \/><\/figure>\n\n\n\n<p>\u8c03\u7528sendfile\u540e\uff0c\u9996\u5148DMA\u673a\u5236\u4f1a\u628a\u6570\u636e\u4ece\u78c1\u76d8\u62f7\u8d1d\u5230\u5185\u6838buf\u4e2d\uff0c\u63a5\u4e0b\u6765\u628a\u6570\u636e\u4ece\u5185\u6838buf\u62f7\u8d1d\u5230\u76f8\u5e94\u7684socket buf\u4e2d\uff0c\u6700\u540e\u5229\u7528DMA\u673a\u5236\u5c06\u6570\u636e\u4ecesocket buf\u62f7\u8d1d\u5230\u7f51\u5361\u4e2d\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u540c\u4f7f\u7528\u4f20\u7edf\u7684read\/write\u76f8\u6bd4\u5c11\u4e86\u4e00\u6b21\u6570\u636e\u62f7\u8d1d\uff0c\u800c\u4e14\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u7684\u5207\u6362\u53ea\u6709\u4e24\u6b21\u3002<\/p>\n\n\n\n<p>\u6709\u7684\u540c\u5b66\u53ef\u80fd\u5df2\u7ecf\u770b\u51fa\u4e86\uff0c\u8fd9\u597d\u50cf\u4e0d\u662f<strong>\u96f6<\/strong>\u62f7\u8d1d\u5427\uff0c\u5728\u5185\u6838\u4e2d\u8fd9\u4e0d\u662f\u8fd8\u6709\u4e00\u6b21\u4ece\u5185\u6838\u6001buf\u5230socket buf\u7684\u6570\u636e\u62f7\u8d1d\u5417\uff1f\u8fd9\u6b21\u62f7\u8d1d\u770b\u4e0a\u53bb\u4e5f\u662f\u6ca1\u6709\u5fc5\u8981\u7684\u3002<\/p>\n\n\n\n<p>\u7684\u786e\u5982\u6b64\uff0c\u4e3a\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c\u5355\u7eaf\u7684\u8f6f\u4ef6\u673a\u5236\u5df2\u7ecf\u4e0d\u591f\u7528\u4e86\uff0c\u6211\u4eec\u9700\u8981\u786c\u4ef6\u6765\u5e2e\u4e00\u70b9\u5fd9\uff0c\u8fd9\u5c31\u662fDMA Gather Copy\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>sendfile \u4e0eDMA Gather Copy<\/strong><\/h4>\n\n\n\n<p>\u4f20\u7edf\u7684DMA\u673a\u5236\u5fc5\u987b\u4ece\u4e00\u6bb5\u8fde\u7eed\u7684\u7a7a\u95f4\u4e2d\u4f20\u8f93\u6570\u636e\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"992\" height=\"318\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590196-image.png\" alt=\"\" class=\"wp-image-987\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590196-image.png 992w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590196-image-300x96.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590196-image-768x246.png 768w\" sizes=\"auto, (max-width: 992px) 100vw, 992px\" \/><\/figure>\n\n\n\n<p>\u5f88\u663e\u7136\uff0c\u4f60\u9700\u8981\u5728\u6e90\u5934\u4e0a\u628a\u6240\u6709\u9700\u8981\u7684\u6570\u636e\u90fd\u62f7\u8d1d\u5230\u4e00\u6bb5\u8fde\u7eed\u7684\u7a7a\u95f4\u4e2d\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"921\" height=\"496\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590200-image.png\" alt=\"\" class=\"wp-image-988\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590200-image.png 921w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590200-image-300x162.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590200-image-768x414.png 768w\" sizes=\"auto, (max-width: 921px) 100vw, 921px\" \/><\/figure>\n\n\n\n<p>\u73b0\u5728\u80af\u5b9a\u6709\u540c\u5b66\u4f1a\u95ee\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u8ba9DMA\u53ef\u4ee5\u4ece\u591a\u4e2a\u6e90\u5934\u6536\u96c6\u6570\u636e\u5462\uff1f<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"924\" height=\"417\" src=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590202-image.png\" alt=\"\" class=\"wp-image-989\" srcset=\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590202-image.png 924w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590202-image-300x135.png 300w, https:\/\/eve2333.top\/wp-content\/uploads\/2025\/04\/1745590202-image-768x347.png 768w\" sizes=\"auto, (max-width: 924px) 100vw, 924px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u5c31\u662f\u6240\u8c13\u7684DMA Gather 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