{"id":210319,"date":"2025-10-24T11:11:26","date_gmt":"2025-10-24T03:11:26","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210319\/"},"modified":"2025-10-24T11:11:27","modified_gmt":"2025-10-24T03:11:27","slug":"cdn-362","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210319\/","title":{"rendered":"CDN\u667a\u80fd\u5316\uff1a\u4e91\u6e38\u620f\u52a0\u901f\u8fc8\u5165\u8d85\u4f4e\u5ef6\u8fdf\u65f6\u4ee3"},"content":{"rendered":"<p>\u968f\u7740\u4e91\u6e38\u620f\u5e02\u573a\u7684\u7206\u53d1\u5f0f\u589e\u957f\uff0c\u5bf9\u201c\u8d85\u4f4e\u5ef6\u8fdf\u201d\u7684\u8981\u6c42\u5df2\u6210\u4e3a\u8861\u91cf\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u6307\u6807\u3002\u4f20\u7edf CDN \u66f4\u591a\u5173\u6ce8\u9759\u6001\u8d44\u6e90\u5206\u53d1\u548c\u7f13\u5b58\u4f18\u5316\uff0c\u4f46\u9762\u5bf9\u5b9e\u65f6\u4ea4\u4e92\u6027\u6781\u5f3a\u7684\u4e91\u6e38\u620f\uff0cCDN 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\u7684\u8981\u6c42\u4e0d\u540c\uff1f<\/h2>\n<p>\u4e91\u6e38\u620f\u628a\u6e38\u620f\u6e32\u67d3\u4e0e\u903b\u8f91\u5728\u4e91\u7aef\u5b8c\u6210\uff0c\u5ba2\u6237\u7aef\u4ec5\u8d1f\u8d23\u63a5\u6536\u89c6\u9891\u6d41\u4e0e\u56de\u4f20\u64cd\u4f5c\u6307\u4ee4\u3002\u8fd9\u79cd\u6a21\u5f0f\u4e0b\uff0c\u5ef6\u8fdf\uff08Latency\uff09\u3001\u6296\u52a8\uff08Jitter\uff09\u4e0e\u4e22\u5305\uff08Packet Loss\uff09\u76f4\u63a5\u51b3\u5b9a\u4e86\u7528\u6237\u4f53\u9a8c\u3002\u4f20\u7edf CDN \u6ce8\u91cd\u9ad8\u5e76\u53d1\u4e0e\u7f13\u5b58\u547d\u4e2d\u7387\uff0c\u800c\u4e91\u6e38\u620f\u9700\u8981\u66f4\u7cbe\u7ec6\u7684\u7f51\u7edc\u63a7\u5236\u3001\u5b9e\u65f6\u4f20\u8f93\u4f18\u5316\u548c\u8fb9\u7f18\u8ba1\u7b97\u80fd\u529b\uff0c\u624d\u80fd\u8fbe\u5230 <strong>\u4e9a 50ms \u751a\u81f3 20ms \u7ea7\u522b\u7684\u7aef\u5230\u7aef\u5ef6\u8fdf<\/strong>\u3002<\/p>\n<h2>\u539f\u7406\uff1aCDN \u667a\u80fd\u5316\u5982\u4f55\u5b9e\u73b0\u8d85\u4f4e\u5ef6\u8fdf<\/h2>\n<p>\u8981\u5b9e\u73b0\u4e91\u6e38\u620f\u7684\u8d85\u4f4e\u5ef6\u8fdf\uff0cCDN \u667a\u80fd\u5316\u6d89\u53ca\u591a\u5c42\u9762\u7684\u6280\u672f\u4f18\u5316\uff0c\u4e0b\u9762\u5206\u5c42\u8bf4\u660e\u3002<\/p>\n<h3>1. \u8fb9\u7f18\u8ba1\u7b97\u4e0e\u6e32\u67d3\u4e0b\u6c89<\/h3>\n<p>\u5c06\u6e38\u620f\u670d\u52a1\u5668\u6216\u6e32\u67d3\u8282\u70b9\u4e0b\u6c89\u5230\u8fb9\u7f18\uff08Edge PoP\uff09\u662f\u964d\u4f4e\u7269\u7406 RTT \u7684\u7b2c\u4e00\u6b65\u3002\u8fb9\u7f18\u8282\u70b9\u914d\u5907 GPU\/TPU \u6216\u652f\u6301\u865a\u62df GPU \u7684\u4e3b\u673a\uff0c\u7ed3\u5408\u5bb9\u5668\u5316 GPU \u8c03\u5ea6\uff0c\u53ef\u5728\u5730\u7406\u4e0a\u63a5\u8fd1\u73a9\u5bb6\uff0c\u5e38\u89c1\u90e8\u7f72\u5305\u62ec\u9999\u6e2f\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65e5\u672c\u670d\u52a1\u5668\u548c\u65b0\u52a0\u5761\u670d\u52a1\u5668\u3002<\/p>\n<ul>\n<li>\u8fb9\u7f18\u6e32\u67d3\u53ef\u4ee5\u628a\u7f51\u7edc\u5f80\u8fd4\u51cf\u5c11\u5230\u6570\u5341\u516c\u91cc\uff0c\u5178\u578b RTT \u4e0b\u964d 30%~70%\u3002<\/li>\n<li>\u9700\u8981\u652f\u6301 GPU \u76f4\u901a\u6216 SR-IOV\uff0c\u4ee5\u4fdd\u8bc1\u6e32\u67d3\u5e27\u7387\u4e0e\u7f16\u7801\u5ef6\u8fdf\u53ef\u63a7\u3002<\/li>\n<\/ul>\n<h3>2. \u4f20\u8f93\u5c42\u4f18\u5316\uff1aUDP\u3001QUIC \u4e0e SRT<\/h3>\n<p>\u4f20\u7edf TCP \u5bf9\u5b9e\u65f6\u573a\u666f\u5e76\u4e0d\u53cb\u597d\uff0c\u56e0\u5176\u91cd\u4f20\u3001\u63e1\u624b\u673a\u5236\u4f1a\u5f15\u5165\u989d\u5916\u5ef6\u8fdf\u3002\u73b0\u4ee3\u4e91\u6e38\u620f\u52a0\u901f\u5e38\u7528\uff1a<\/p>\n<ul>\n<li>\u57fa\u4e8e UDP \u7684\u4f20\u8f93\uff0c\u914d\u5408\u81ea\u5b9a\u4e49\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u548c\u5feb\u901f\u91cd\u4f20\u7b56\u7565\u3002<\/li>\n<li>QUIC\uff08\u57fa\u4e8e UDP \u7684\u591a\u8def\u590d\u7528\u4e0e 0-RTT\uff09\u53ef\u964d\u4f4e\u8fde\u63a5\u5efa\u7acb\u65f6\u95f4\u5e76\u51cf\u5c11 HOL\uff08Head-of-Line\uff09\u963b\u585e\u3002<\/li>\n<li>SRT\uff08Secure Reliable Transport\uff09\u5728\u4e22\u5305\u4e0e\u6296\u52a8\u73af\u5883\u91cc\u8868\u73b0\u4f18\u5f02\uff0c\u652f\u6301 FEC \u4e0e\u81ea\u9002\u5e94\u91cd\u4f20\u3002<\/li>\n<\/ul>\n<h3>3. \u524d\u5411\u7ea0\u9519\uff08FEC\uff09\u3001ARQ \u4e0e\u6df7\u5408\u7b56\u7565<\/h3>\n<p>\u5728\u5b9e\u65f6\u89c6\u9891\u6d41\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u7ea0\u9519\u7b56\u7565\u53ef\u4ee5\u5728\u4e0d\u663e\u8457\u589e\u52a0\u5ef6\u8fdf\u7684\u524d\u63d0\u4e0b\u964d\u4f4e\u611f\u77e5\u4e22\u5305\u3002<\/p>\n<ul>\n<li><strong>FEC<\/strong>\uff1a\u53d1\u9001\u5197\u4f59\u5e27\uff0c\u5e38\u7528\u53c2\u6570\u4e3a (k, n) \u65b9\u6848\uff0c\u4f8b\u5982 k=10, n=12\uff0c\u53ef\u5bb9\u5fcd 2 \u5305\u4e22\u5931\u800c\u65e0\u9700\u91cd\u4f20\u3002<\/li>\n<li>ARQ\uff08\u91cd\u4f20\uff09\u5bf9\u5b9e\u65f6\u573a\u666f\u8981\u8c28\u614e\u4f7f\u7528\uff0c\u9002\u5408\u8f83\u77ed\u7684 RTT \u573a\u666f\u6216\u5173\u952e\u63a7\u5236\u6d88\u606f\u3002<\/li>\n<li>\u6df7\u5408 FEC+ARQ\uff1a\u5bf9\u5173\u952e\u5e27\u4f7f\u7528 FEC\uff0c\u5bf9\u6b21\u8981\u5e27\u4f7f\u7528\u5ef6\u8fdf\u53ef\u63a7\u7684 ARQ \u7b56\u7565\u3002<\/li>\n<\/ul>\n<h3>4. \u7f16\u7801\u5668\u4e0e\u5ef6\u8fdf\u4f18\u5316<\/h3>\n<p>\u89c6\u9891\u7f16\u7801\u5668\u7684\u9009\u62e9\u4e0e\u53c2\u6570\u8c03\u4f18\u5bf9\u7aef\u5230\u7aef\u5ef6\u8fdf\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<ul>\n<li>\u4f4e\u5ef6\u8fdf\u7f16\u7801\uff08Low-Latency H.265 \/ AV1\uff09\u548c\u786c\u4ef6\u7f16\u7801\u5668\uff08NVENC\u3001VCE\uff09\u53ef\u5c06\u7f16\u7801\u5ef6\u8fdf\u538b\u5230 5-10ms\u3002<\/li>\n<li>\u8c03\u4f4e GOP\uff08Group of Pictures\uff09\u957f\u5ea6\u4e0e\u4f7f\u7528\u4f4e\u5ef6\u8fdf\u9884\u8bbe\u6709\u52a9\u4e8e\u51cf\u5c11\u5173\u952e\u5e27\u6062\u590d\u65f6\u95f4\u3002<\/li>\n<li>\u52a8\u6001\u7801\u7387\uff08ABR\uff09\u4e0e\u5206\u5c42\u7f16\u7801\uff08SVC\uff09\u53ef\u5728\u7f51\u7edc\u6ce2\u52a8\u65f6\u7ef4\u6301\u4ea4\u4e92\u6027\u4e0e\u753b\u8d28\u5e73\u8861\u3002<\/li>\n<\/ul>\n<h3>5. \u667a\u80fd\u8def\u7531\u4e0e\u673a\u5668\u5b66\u4e60\u8c03\u5ea6<\/h3>\n<p>\u667a\u80fd CDN \u901a\u8fc7 SDN\/NFV \u548c\u673a\u5668\u5b66\u4e60\u5b9e\u65f6\u4f18\u5316\u8def\u7531\u4e0e\u8d44\u6e90\u8c03\u5ea6\uff1a<\/p>\n<ul>\n<li>\u5229\u7528 ML \u6a21\u578b\u9884\u6d4b\u94fe\u8def\u4e22\u5305\u4e0e\u5ef6\u8fdf\u8d8b\u52bf\uff0c\u9884\u5148\u5207\u6362\u8def\u5f84\u6216\u8c03\u6574 FEC \u53c2\u6570\u3002<\/li>\n<li>Anycast \u4e0e\u667a\u80fd BGP \u8def\u7531\u7ed3\u5408\uff0c\u5feb\u901f\u9009\u62e9\u6700\u4f18 PoP\uff1b\u5728\u5168\u7403\u573a\u666f\u4e0b\u9700\u8003\u8651\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u6b27\u6d32\/\u65e5\u672c\/\u97e9\u56fd\u8282\u70b9\u7684\u534f\u540c\u3002<\/li>\n<li>\u7f51\u7edc\u5207\u7247\u4e0e QoS \u7b56\u7565\u5728 ISP \u4fa7\u7684\u652f\u6301\u80fd\u4e3a\u4e91\u6e38\u620f\u6d41\u91cf\u63d0\u4f9b\u5e26\u5bbd\u4fdd\u8bc1\u4e0e\u6296\u52a8\u63a7\u5236\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\uff1a\u8c01\u6700\u9700\u8981 CDN \u667a\u80fd\u5316\u52a0\u901f\uff1f<\/h2>\n<p>\u4e91\u6e38\u620f\u5e76\u975e\u5355\u4e00\u573a\u666f\uff0c\u5176\u52a0\u901f\u8bc9\u6c42\u968f\u4e1a\u52a1\u7c7b\u578b\u53d8\u5316\uff1a<\/p>\n<h3>1. \u4e3b\u673a\/PC \u4e91\u6e38\u620f<\/h3>\n<p>\u5bf9\u753b\u8d28\u4e0e\u6d41\u7545\u5ea6\u8981\u6c42\u9ad8\uff0c\u9700\u652f\u6301 60fps\/120fps\u30014K \u8f93\u51fa\u7684\u573a\u666f\uff0c\u66f4\u4f9d\u8d56\u8fb9\u7f18 GPU \u4e0e\u4f4e\u5ef6\u8fdf\u7f16\u7801\u3002<\/p>\n<h3>2. \u8f7b\u91cf\u79fb\u52a8\u4e91\u6e38\u620f<\/h3>\n<p>\u79fb\u52a8\u7aef\u66f4\u591a\u5173\u6ce8\u8fde\u63a5\u7a33\u5b9a\u6027\u4e0e\u5e26\u5bbd\u81ea\u9002\u5e94\uff0c\u7ed3\u5408 ABR \u4e0e\u4f4e\u529f\u8017\u7f16\u7801\u80fd\u63d0\u5347\u79fb\u52a8\u4f53\u9a8c\u3002\u5206\u5e03\u5728\u9999\u6e2f\u3001\u65b0\u52a0\u5761\u6216\u97e9\u56fd\u7684\u8282\u70b9\u5bf9\u4e9a\u592a\u7528\u6237\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<h3>3. \u7ade\u6280\u7c7b\u5b9e\u65f6\u5bf9\u6218<\/h3>\n<p>\u6781\u7aef\u4f4e\u5ef6\u8fdf\u9700\u6c42\uff08\u76ee\u6807\u7aef\u5230\u7aef\u5ef6\u8fdf &lt;30ms\uff09\uff0c\u9700\u8981\u5c31\u8fd1\u90e8\u7f72\u3001\u4e13\u6709\u94fe\u8def\u6216 ISP \u4e92\u8054\u4ee5\u4fdd\u8bc1\u65f6\u5ef6\u53ef\u9884\u6d4b\u3002<\/p>\n<h3>4. 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\u8c03\u5ea6\u3001\u5bb9\u5668\u5316\u5b9e\u4f8b\u5feb\u901f\u5f39\u6027\u4f38\u7f29\uff0c\u9002\u5e94\u5cf0\u503c\u9700\u6c42\uff1b\u4f20\u7edf CDN \u4fa7\u91cd HTTP \u7f13\u5b58\u548c\u5e26\u5bbd\u6269\u5bb9\u3002<\/li>\n<li><strong>\u7f51\u7edc\u9002\u5e94\u6027<\/strong>\uff1a\u667a\u80fd CDN \u80fd\u57fa\u4e8e\u5b9e\u65f6\u76d1\u63a7\u8c03\u6574\u8def\u7531\u548c\u7801\u7387\u7b56\u7565\uff1b\u4f20\u7edf CDN \u5728\u7f51\u7edc\u7a81\u53d1\u4e8b\u4ef6\u65f6\u6062\u590d\u901f\u5ea6\u8f83\u6162\u3002<\/li>\n<li><strong>\u6210\u672c\u7ed3\u6784<\/strong>\uff1a\u667a\u80fd\u5316\u65b9\u6848\u5728\u8fb9\u7f18\u8d44\u6e90\u4e0e\u4e13\u7528\u94fe\u8def\u4e0a\u6210\u672c\u8f83\u9ad8\uff0c\u4f46\u5728\u7528\u6237\u7559\u5b58\u4e0e\u4ed8\u8d39\u8f6c\u5316\u4e0a\u7684 ROI 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