{"id":1450,"date":"2026-10-26T12:00:00","date_gmt":"2026-10-26T03:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1450"},"modified":"2026-10-23T12:14:53","modified_gmt":"2026-10-23T03:14:53","slug":"qs-tcp-rto-rtt-variation-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1450","title":{"rendered":"TCP\u306eRTO\u3001\u5f80\u5fa9\u6642\u9593\u3068\u518d\u9001\u307e\u3067\u306e\u5f85\u3061\u6642\u9593\u304c\u9055\u3046\u7406\u7531"},"content":{"rendered":"<p>\u901a\u4fe1\u306e\u5f80\u5fa9\u306b100\u30df\u30ea\u79d2\u304b\u304b\u308b\u306a\u3089\u3001100\u30df\u30ea\u79d2\u5f85\u3063\u3066\u8fd4\u4e8b\u304c\u306a\u3051\u308c\u3070\u9001\u308a\u76f4\u3059\u3002\u305d\u308c\u3060\u3051\u3067\u306f\u3001\u5c11\u3057\u9045\u308c\u3066\u5c4a\u304f\u5fdc\u7b54\u307e\u3067\u53d6\u308a\u3053\u307c\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002TCP\u306e\u518d\u9001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3001RTO\uff08Retransmission Timeout\uff09\u306f\u3001\u6e2c\u3063\u305f\u5f80\u5fa9\u6642\u9593\u305d\u306e\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u5fdc\u7b54\u3092\u5f85\u3064\u305f\u3081\u306b\u6c7a\u3081\u308b\u6642\u9593\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306fRFC 6298\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u3001\u5c0f\u3055\u306a\u6570\u5024\u4f8b\u3067\u8ffd\u3044\u307e\u3059\u3002\u5e73\u5747\u306b\u76f8\u5f53\u3059\u308b\u5024\u3001\u6642\u9593\u306e\u63fa\u308c\u3001\u5f85\u3061\u6642\u9593\u306e\u4e0b\u9650\u3092\u5206\u3051\u308b\u3068\u3001\u300cRTT\u304c\u5909\u308f\u3063\u305f\u306e\u306bRTO\u304c\u540c\u3058\u300d\u3068\u3044\u3046\u7d50\u679c\u3082\u8aad\u307f\u89e3\u3051\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>RTT\u306f\u5f80\u5fa9\u6642\u9593\u306e\u89b3\u6e2c\u5024\u3001RTO\u306f\u518d\u9001\u30bf\u30a4\u30de\u30fc\u306e\u5f85\u3061\u6642\u9593\u3002\u5e73\u6ed1\u5316\u3057\u305fRTT\u306b\u3001\u6642\u9593\u306e\u63fa\u308c\u3092\u8003\u616e\u3057\u305f\u4f59\u88d5\u3092\u52a0\u3048\u307e\u3059\u3002<\/li>\n<li>\u63fa\u308c\u3092\u66f4\u65b0\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u66f4\u65b0\u524d\u306e\u5e73\u6ed1\u5316RTT\u3092\u4f7f\u3044\u307e\u3059\u3002\u8a08\u7b97\u9806\u5e8f\u3092\u5165\u308c\u66ff\u3048\u308b\u3068\u3001\u540c\u3058\u89b3\u6e2c\u5024\u3067\u3082\u7d50\u679c\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/li>\n<li>RFC 6298\u304c\u63a8\u5968\u3059\u308b1\u79d2\u306e\u4e0b\u9650\u3092\u63a1\u308b\u3068\u3001\u4e0b\u9650\u9069\u7528\u524d\u306e\u8a08\u7b97\u5024\u304c\u5909\u5316\u3057\u3066\u3082\u3001\u6700\u7d42RTO\u306f1\u79d2\u306e\u307e\u307e\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u30bf\u30a4\u30de\u30fc\u6e80\u4e86\u306b\u3088\u308b\u518d\u9001\u3067\u306f\u5f85\u3061\u6642\u9593\u3092\u500d\u306b\u3057\u307e\u3059\u3002RTT\u306e\u66f4\u65b0\u3001\u4e0b\u9650\u306e\u9069\u7528\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u5f8c\u306e\u500d\u5897\u306f\u3001\u305d\u308c\u305e\u308c\u5225\u306e\u51e6\u7406\u3067\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u89b3\u6e2c\u3059\u308b\u6642\u9593\u3068\u3001\u5f85\u3064\u305f\u3081\u306e\u6642\u9593<\/h2>\n<p>TCP\u306f\u30c7\u30fc\u30bf\u306e\u53d7\u4fe1\u3092\u78ba\u8a8d\u5fdc\u7b54\uff08ACK\uff09\u3067\u78ba\u304b\u3081\u307e\u3059\u3002\u30c7\u30fc\u30bf\u3092\u9001\u3063\u3066\u304b\u3089\u5bfe\u5fdc\u3059\u308bACK\u3092\u53d7\u3051\u53d6\u308b\u307e\u3067\u306e\u6642\u9593\u304c\u3001\u3053\u3053\u3067\u6271\u3046RTT\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u3059\u3002\u7d4c\u8def\u3084\u51e6\u7406\u306e\u6761\u4ef6\u304c\u5909\u308f\u308c\u3070\u3001\u305d\u306e\u5024\u3082\u63fa\u308c\u307e\u3059\u3002\u307e\u3060ACK\u304c\u6765\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u4e8b\u5b9f\u3060\u3051\u3067\u3001\u30c7\u30fc\u30bf\u304c\u5931\u308f\u308c\u305f\u3068\u65ad\u5b9a\u3067\u304d\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u73fe\u884cTCP\u57fa\u672c\u4ed5\u69d8\u306eRFC 9293\u306f\u3001RTO\u3092\u52d5\u7684\u306b\u6c7a\u3081\u3001RFC 6298\u306e\u624b\u9806\u3067\u8a08\u7b97\u3059\u308b\u3053\u3068\u3092\u8981\u6c42\u3057\u3066\u3044\u307e\u3059\u3002RFC 6298\u306f2011\u5e74\u306eProposed Standard\u3001RFC 9293\u306f2022\u5e74\u306eInternet Standard\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u4ed5\u69d8\u306b\u6cbf\u3063\u305f\u8a08\u7b97\u4f8b\u3067\u3042\u308a\u3001\u7279\u5b9aOS\u306e\u73fe\u5728\u306e\u8a2d\u5b9a\u5024\u3084\u5b9f\u969b\u306e\u56de\u7dda\u3092\u6e2c\u3063\u305f\u7d50\u679c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002[1][2]<\/p>\n<h2>\u300c\u3044\u3064\u3082\u306e\u6642\u9593\u300d\u3068\u300c\u305d\u3053\u304b\u3089\u306e\u305a\u308c\u300d\u3092\u6301\u3064<\/h2>\n<p>\u8a08\u7b97\u306b\u306fSRTT\uff08\u5e73\u6ed1\u5316\u3057\u305fRTT\uff09\u3068RTTVAR\uff08RTT\u306e\u5909\u52d5\u3092\u8868\u3059\u5024\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002SRTT\u306f\u65b0\u3057\u3044\u89b3\u6e2c\u3067\u5c11\u3057\u305a\u3064\u52d5\u304f\u57fa\u6e96\u3001RTTVAR\u306f\u89b3\u6e2c\u304c\u305d\u306e\u57fa\u6e96\u304b\u3089\u3069\u308c\u304f\u3089\u3044\u96e2\u308c\u305f\u304b\u3092\u84c4\u3048\u308b\u5024\u3067\u3059\u3002RTTVAR\u306f\u4e8c\u4e57\u3057\u305f\u504f\u5dee\u306e\u5e73\u5747\u3067\u306f\u306a\u304f\u3001\u6642\u9593\u3068\u540c\u3058\u5358\u4f4d\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n<p>\u521d\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u3092R\u3068\u3059\u308b\u3068\u3001SRTT\uff1dR\u3001RTTVAR\uff1dR\u00f72\u3067\u59cb\u3081\u307e\u3059\u3002\u305d\u306e\u5f8c\u306e\u30b5\u30f3\u30d7\u30ebR\u2032\u3067\u306f\u3001\u307e\u305aRTTVAR\u3092\u300c\u65e7RTTVAR\u306e3\/4\uff0b|\u65e7SRTT\u2212R\u2032|\u306e1\/4\u300d\u3001\u6b21\u306bSRTT\u3092\u300c\u65e7SRTT\u306e7\/8\uff0bR\u2032\u306e1\/8\u300d\u3078\u66f4\u65b0\u3057\u307e\u3059\u3002\u3053\u308c\u306fRFC 6298\u304c\u63a8\u5968\u3059\u308b\u4fc2\u6570\u3092\u4f7f\u3046\u5834\u5408\u3067\u3059\u3002\u4e0b\u9650\u9069\u7528\u524d\u306eRTO\u306f\u300cSRTT\uff0bmax\uff08G, 4\u00d7RTTVAR\uff09\u300d\u3068\u306a\u308a\u307e\u3059\u3002G\u306f\u6642\u8a08\u306e\u7c92\u5ea6\u3001max\u306f\u4e8c\u3064\u306e\u3046\u3061\u5927\u304d\u3044\u65b9\u3067\u3059\u3002[1]<\/p>\n<p>\u5f0f\u304c\u9577\u304f\u898b\u3048\u3066\u3082\u3001\u5f79\u5272\u306f\u4e8c\u3064\u3067\u3059\u3002SRTT\u3067\u89b3\u6e2c\u306e\u4e2d\u5fc3\u3092\u8ffd\u3044\u3001RTTVAR\u3067\u305d\u306e\u5468\u56f2\u306e\u63fa\u308c\u306b\u5099\u3048\u307e\u3059\u3002\u65b0\u3057\u3044RTT\u304c\u5927\u304d\u304f\u5916\u308c\u305f\u3068\u304d\u3001SRTT\u3060\u3051\u3092\u898b\u3066\u3044\u308b\u3068\u5c0f\u3055\u306a\u5909\u5316\u306b\u898b\u3048\u3066\u3082\u3001\u5f85\u3064\u305f\u3081\u306e\u4f59\u88d5\u306f\u5927\u304d\u304f\u306a\u308a\u3048\u307e\u3059\u3002<\/p>\n<h2>100\u3001120\u3001400\u30df\u30ea\u79d2\u3092\u9806\u306b\u89b3\u6e2c\u3059\u308b\u3068<\/h2>\n<p>\u8a08\u7b97\u6761\u4ef6\u3092\u56fa\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002G\u306f1\u30df\u30ea\u79d2\u3001\u4e0a\u8a18\u306e\u4fc2\u6570\u3092\u4f7f\u3044\u3001\u63a1\u7528\u53ef\u80fd\u306aRTT\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066100\u3001120\u3001400\u30df\u30ea\u79d2\u304c\u9806\u756a\u306b\u5f97\u3089\u308c\u305f\u3068\u3057\u307e\u3059\u3002\u3053\u306e\u9593\u306b\u518d\u9001\u306b\u3088\u308b\u30b5\u30f3\u30d7\u30eb\u306e\u66d6\u6627\u3055\u306f\u306a\u304f\u3001\u30bf\u30a4\u30de\u30fc\u6e80\u4e86\u306b\u3088\u308b\u500d\u5897\u3082\u306a\u3044\u4f8b\u3067\u3059\u3002<\/p>\n<p>\u521d\u56de100\u30df\u30ea\u79d2\u3067\u306f\u3001SRTT\u306f100\u3001RTTVAR\u306f50\u3002\u3057\u305f\u304c\u3063\u3066\u4e0b\u9650\u9069\u7528\u524dRTO\u306f100\uff0b4\u00d750\uff1d300\u30df\u30ea\u79d2\u3067\u3059\u3002\u6b21\u306e120\u30df\u30ea\u79d2\u3067\u306f\u65e7SRTT\u3068\u306e\u5dee\u306f20\u3002RTTVAR\u306f50\u00d73\/4\uff0b20\u00d71\/4\uff1d42.5\u3001SRTT\u306f100\u00d77\/8\uff0b120\u00d71\/8\uff1d102.5\u3068\u306a\u308a\u3001\u4e0b\u9650\u9069\u7528\u524dRTO\u306f272.5\u30df\u30ea\u79d2\u3067\u3059\u3002<\/p>\n<p>2\u56de\u76ee\u306eRTT\u306f\u9577\u304f\u306a\u3063\u305f\u306e\u306b\u3001\u8a08\u7b97\u5024\u306f300\u304b\u3089272.5\u30df\u30ea\u79d2\u3078\u77ed\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u7406\u7531\u306f\u3001SRTT\u304c2.5\u5897\u3048\u305f\u4e00\u65b9\u3067\u30014\u00d7RTTVAR\u304c200\u304b\u3089170\u3078\u6e1b\u3063\u305f\u305f\u3081\u3067\u3059\u3002\u300c\u4eca\u56de\u306eRTT\u304c\u5927\u304d\u3044\u307b\u3069\u3001RTO\u3082\u5fc5\u305a\u5927\u304d\u304f\u306a\u308b\u300d\u3068\u3044\u3046\u4e00\u5bfe\u4e00\u306e\u5bfe\u5fdc\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<figure style=\"margin:1.5em 0\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-tcp-rto-rtt-variation-20261023-figure-95ad375ed80f.png\" alt=\"RTT\u30b5\u30f3\u30d7\u30eb100\u3001120\u3001400\u30df\u30ea\u79d2\u304b\u3089\u6c42\u3081\u305fSRTT\u306f100\u3001102.5\u3001139.6875\u30df\u30ea\u79d2\u3001RTTVAR\u306f50\u300142.5\u3001106.25\u30df\u30ea\u79d2\u3002\u4e0b\u9650\u9069\u7528\u524dRTO\u306f300\u3001272.5\u3001564.6875\u30df\u30ea\u79d2\u3067\u30011\u79d2\u306e\u4e0b\u9650\u9069\u7528\u5f8c\u306f\u3044\u305a\u308c\u30821000\u30df\u30ea\u79d2\u3002\" style=\"display:block;max-width:100%;height:auto;margin:auto\"\/><figcaption>\u540c\u3058\u66f4\u65b0\u5f0f\u30923\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u306b\u9069\u7528\u3057\u305f\u72ec\u81ea\u8a08\u7b97\u3002\u3059\u3079\u3066\u30df\u30ea\u79d2\u3002\u4e0b\u6bb5\u3067\u306fRFC 6298\u306e\u63a8\u5968\u306b\u5f93\u3044\u3001\u8a08\u7b97\u5024\u304c1\u79d2\u672a\u6e80\u306a\u30891\u79d2\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u6e2c\u30c7\u30fc\u30bf\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/figcaption><\/figure>\n<p>3\u56de\u76ee\u306e400\u30df\u30ea\u79d2\u3067\u306f\u3001\u65e7SRTT\u3068\u306e\u5dee\u304c297.5\u3078\u5e83\u304c\u308a\u307e\u3059\u3002RTTVAR\u306f42.5\u00d73\/4\uff0b297.5\u00d71\/4\uff1d106.25\u3001SRTT\u306f139.6875\u3068\u306a\u308a\u3001\u4e0b\u9650\u9069\u7528\u524dRTO\u306f564.6875\u30df\u30ea\u79d2\u3067\u3059\u3002SRTT\u306e\u5897\u52a0\u306f37.1875\u30df\u30ea\u79d2\u3067\u3059\u304c\u3001\u4f59\u88d5\u306e\u90e8\u5206\u306f170\u304b\u3089425\u30df\u30ea\u79d2\u3078\u5897\u3048\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306e\u305a\u308c\u3092\u5f85\u3061\u6642\u9593\u306b\u53cd\u6620\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u4e3b\u306b\u5f8c\u8005\u3067\u3059\u3002<\/p>\n<h2>\u4e0b\u9650\u304c\u3042\u308b\u3068\u3001\u5909\u5316\u306f\u8868\u9762\u306b\u51fa\u306a\u3044<\/h2>\n<p>RFC 6298\u306f\u3001\u8a08\u7b97\u3057\u305fRTO\u304c1\u79d2\u672a\u6e80\u306a\u30891\u79d2\u306b\u5f15\u304d\u4e0a\u3052\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002\u898f\u5b9a\u306e\u5f37\u3055\u306fSHOULD\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306e\u5b9f\u88c5\u304c\u5e38\u306b\u540c\u3058\u4e0b\u9650\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3044\u3046\u89b3\u6e2c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u63a8\u5968\u3092\u63a1\u7528\u3057\u305f\u4e0a\u306e\u4f8b\u3067\u306f\u30013\u56de\u3068\u3082\u6700\u7d42RTO\u306f1000\u30df\u30ea\u79d2\u306b\u306a\u308a\u307e\u3059\u3002[1]<\/p>\n<p>\u3053\u3053\u3067\u6700\u7d42RTO\u3060\u3051\u3092\u8a18\u9332\u3059\u308b\u3068\u3001\u5185\u90e8\u8a08\u7b97\u304c\u5909\u308f\u3063\u305f\u3053\u3068\u306f\u898b\u3048\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001SRTT\u3082RTTVAR\u3082\u66f4\u65b0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u8a3a\u65ad\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u6e2c\u5b9aRTT\u3001\u66f4\u65b0\u5f8cSRTT\u3001\u66f4\u65b0\u5f8cRTTVAR\u3001\u4e0b\u9650\u9069\u7528\u524d\u306e\u5024\u3001\u6700\u7d42RTO\u3092\u5206\u3051\u3066\u4e26\u3079\u308b\u3068\u3001\u3069\u306e\u51e6\u7406\u304c\u7d50\u679c\u3092\u6c7a\u3081\u305f\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3082\u3046\u4e00\u3064\u3001\u3053\u306e\u4f8b\u306eG\u3092\u5909\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u30023\u56de\u76ee\u306f4\u00d7RTTVAR\uff1d425\u30df\u30ea\u79d2\u306a\u306e\u3067\u3001G\u30921\u304b\u308910\u30df\u30ea\u79d2\u306b\u3057\u3066\u3082max\u306e\u7d50\u679c\u306f425\u306e\u307e\u307e\u3067\u3059\u3002\u6642\u8a08\u306e\u7c92\u5ea6\u3092\u5909\u66f4\u3059\u308c\u3070\u3001\u3053\u306e\u5f0f\u306e\u7d50\u679c\u304c\u3044\u3064\u3067\u3082\u5909\u308f\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3069\u3061\u3089\u306e\u9805\u304c\u5927\u304d\u3044\u304b\u3092\u5148\u306b\u898b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u66f4\u65b0\u9806\u5e8f\u3092\u5165\u308c\u66ff\u3048\u308b\u3068\u3001\u5225\u306e\u8a08\u7b97\u306b\u306a\u308b<\/h2>\n<p>3\u56de\u76ee\u306eRTTVAR\u3092\u6c42\u3081\u308b\u524d\u306bSRTT\u3092139.6875\u3078\u66f4\u65b0\u3057\u3066\u3057\u307e\u3046\u3068\u3001400\u3068\u306e\u5dee\u3092260.3125\u3068\u3057\u3066\u6271\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u8aa4\u3063\u305f\u9806\u5e8f\u3067\u306fRTTVAR\u306f96.953125\u3001\u4e0b\u9650\u9069\u7528\u524dRTO\u306f527.5\u30df\u30ea\u79d2\u3067\u3059\u3002\u6b63\u3057\u3044564.6875\u30df\u30ea\u79d2\u3088\u308a37.1875\u30df\u30ea\u79d2\u77ed\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3082\u3001\u3053\u306e\u4f8b\u3067\u306f\u8aa4\u3063\u305f\u8a08\u7b97\u3067\u30821\u79d2\u306e\u4e0b\u9650\u306b\u5f15\u304d\u4e0a\u3052\u3089\u308c\u307e\u3059\u3002\u6700\u7d42RTO\u304c\u6b63\u3057\u304f\u898b\u3048\u308b\u3053\u3068\u3060\u3051\u3067\u306f\u3001\u5185\u90e8\u306e\u66f4\u65b0\u5f0f\u3082\u6b63\u3057\u3044\u3068\u306f\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3002\u5b9f\u88c5\u3084\u8a08\u7b97\u8868\u3092\u70b9\u691c\u3059\u308b\u306a\u3089\u3001\u4e0b\u9650\u3092\u304b\u3051\u308b\u524d\u306e\u4e2d\u9593\u5024\u307e\u3067\u6bd4\u3079\u308b\u3053\u3068\u304c\u6709\u52b9\u3067\u3059\u3002\u3053\u308c\u306f\u4e0a\u306e\u6570\u5024\u304b\u3089\u5f97\u305f\u6bd4\u8f03\u3067\u3042\u308a\u3001\u7279\u5b9a\u306e\u5b9f\u88c5\u3067\u4e0d\u5177\u5408\u3092\u89b3\u6e2c\u3057\u305f\u3068\u3044\u3046\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u5f8c\u306e\u500d\u5897\u3068\u3001RTT\u306e\u6e2c\u5b9a\u3092\u6df7\u305c\u306a\u3044<\/h2>\n<p>RFC 6298\u306e\u30bf\u30a4\u30de\u30fc\u7ba1\u7406\u3067\u306f\u3001\u6e80\u4e86\u6642\u306b\u672a\u78ba\u8a8d\u306e\u6700\u3082\u65e9\u3044\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u518d\u9001\u3057\u3001RTO\u3092\u500d\u306b\u3057\u3066\u6b21\u306e\u30bf\u30a4\u30de\u30fc\u3092\u59cb\u3081\u307e\u3059\u3002\u307e\u305f\u3001\u518d\u9001\u3057\u305f\u30bb\u30b0\u30e1\u30f3\u30c8\u306f\u3001\u3069\u306e\u9001\u4fe1\u3078\u306eACK\u304b\u66d6\u6627\u306b\u306a\u308b\u305f\u3081\u3001\u539f\u5247\u3068\u3057\u3066RTT\u6e2c\u5b9a\u306b\u4f7f\u3044\u307e\u305b\u3093\u3002\u3053\u308c\u306fKarn\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u3002\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u66d6\u6627\u3055\u3092\u9664\u3051\u308b\u5834\u5408\u306f\u4f8b\u5916\u304c\u3042\u308a\u307e\u3059\u3002[1]<\/p>\n<p>\u5225\u306e\u5358\u7d14\u306a\u4f8b\u3068\u3057\u3066\u3001RTO\u304c1\u79d2\u306e\u6642\u70b9\u304b\u3089\u3001ACK\u3082\u65b0\u3057\u3044\u6e2c\u5b9a\u3082\u306a\u304f\u6e80\u4e86\u304c\u7d9a\u304f\u5834\u5408\u3092\u8003\u3048\u307e\u3059\u3002\u6700\u521d\u306e\u6e80\u4e86\u307e\u30671\u79d2\u3001\u6b21\u306f2\u79d2\u3001\u305d\u306e\u6b21\u306f4\u79d2\u5f85\u3064\u305f\u3081\u3001\u57fa\u6e96\u306e\u9001\u4fe1\u6642\u523b\u30920\u3068\u3059\u308c\u3070\u6e80\u4e86\u6642\u523b\u306f1\u30013\u30017\u79d2\u3067\u3059\u3002\u300c1\u30012\u30014\u300d\u306f\u5f85\u3064\u9593\u9694\u3067\u3042\u3063\u3066\u3001\u6700\u521d\u304b\u3089\u306e\u7d4c\u904e\u6642\u523b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u4f8b\u306f\u4e0a\u9650\u3084\u63a5\u7d9a\u306e\u6253\u5207\u308a\u3092\u8003\u3048\u306a\u3044\u77ed\u30443\u533a\u9593\u3060\u3051\u306e\u8a08\u7b97\u3067\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306eTCP\u306b\u306fRTO\u4ee5\u5916\u306e\u640d\u5931\u56de\u5fa9\u3082\u3042\u308a\u307e\u3059\u3002RFC 9293\u306f\u3001\u518d\u9001\u30ad\u30e5\u30fc\u306e\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u51e6\u7406\u3068\u3001\u5225\u9014\u898f\u5b9a\u3055\u308c\u305fFast Retransmit\u306a\u3069\u306e\u6a5f\u69cb\u3092\u533a\u5225\u3057\u3066\u3044\u307e\u3059\u3002RTO\u304b\u3089\u3059\u3079\u3066\u306e\u518d\u9001\u6642\u523b\u3092\u9006\u7b97\u3057\u305f\u308a\u3001HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u3082\u3046\u4e00\u5ea6\u5b9f\u884c\u3057\u3066\u3088\u3044\u304b\u3092\u5224\u65ad\u3057\u305f\u308a\u306f\u3067\u304d\u307e\u305b\u3093\u3002TCP\u306e\u30bf\u30a4\u30de\u30fc\u3001\u63a5\u7d9a\u306e\u7d42\u4e86\u5224\u65ad\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u518d\u8a66\u884c\u3092\u3001\u305d\u308c\u305e\u308c\u306e\u5c64\u306e\u60c5\u5831\u3067\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002[2]<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ol>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc6298\">RFC 6298 \u2014 Computing TCP\u2019s Retransmission Timer<\/a>\uff082011\u5e746\u6708\u3001Proposed Standard\uff09\u3002\u7b2c2\u301c5\u7bc0\u3002\u8a08\u7b97\u9806\u5e8f\u3001\u4fc2\u6570\u3001\u4e0b\u9650\u3001\u30b5\u30f3\u30d7\u30eb\u9078\u629e\u3001\u30bf\u30a4\u30de\u30fc\u7ba1\u7406\u3002<\/li>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc9293\">RFC 9293 \u2014 Transmission Control Protocol (TCP)<\/a>\uff082022\u5e748\u6708\u3001Internet Standard \/ STD 7\uff09\u3002\u7b2c3.8.1\u7bc0\u3001\u7b2c3.10.8\u7bc0\u3002TCP\u57fa\u672c\u4ed5\u69d8\u3068\u518d\u9001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u4fe1\u306e\u5f80\u5fa9\u306b100\u30df\u30ea\u79d2\u304b\u304b\u308b\u306a\u3089\u3001100\u30df\u30ea\u79d2\u5f85\u3063\u3066\u8fd4\u4e8b\u304c\u306a\u3051\u308c\u3070\u9001\u308a\u76f4\u3059\u3002\u305d\u308c\u3060\u3051\u3067\u306f\u3001\u5c11\u3057\u9045\u308c\u3066\u5c4a\u304f\u5fdc\u7b54\u307e\u3067\u53d6\u308a\u3053\u307c\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002TCP\u306e\u518d\u9001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3001RTO\uff08Retransmission Timeout\uff09\u306f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1448,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[29],"tags":[287],"class_list":["post-1450","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-communications-networking","tag-tcp-rto"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-tcp-rto-rtt-variation-20261023-featured-02676606e1a7.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1450","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1450"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1450\/revisions"}],"predecessor-version":[{"id":1451,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1450\/revisions\/1451"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1448"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}