锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20037;&#20037;&#20154;&#20154;&#29245;&#20154;&#20154;&#20154;&#20154;&#29255;&#97;&#118;&#44;&#57;&#55;&#20037;&#20037;&#22269;&#20135;&#32508;&#21512;&#31934;&#21697;&#22899;&#19981;&#21345;&#13;&#44;&#20037;&#20037;&#27611;&#29255;&#19968;&#21306;&#20108;&#21306;</title><link>http://m.shnenglu.com/alexhappy/category/10213.html</link><description>Faith First</description><language>zh-cn</language><lastBuildDate>Fri, 22 May 2009 15:48:40 GMT</lastBuildDate><pubDate>Fri, 22 May 2009 15:48:40 GMT</pubDate><ttl>60</ttl><item><title>TCP涔婼end鍑芥暟</title><link>http://m.shnenglu.com/alexhappy/articles/79781.html</link><dc:creator> Call me Alex</dc:creator><author> Call me Alex</author><pubDate>Mon, 13 Apr 2009 02:51:00 GMT</pubDate><guid>http://m.shnenglu.com/alexhappy/articles/79781.html</guid><wfw:comment>http://m.shnenglu.com/alexhappy/comments/79781.html</wfw:comment><comments>http://m.shnenglu.com/alexhappy/articles/79781.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/alexhappy/comments/commentRss/79781.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/alexhappy/services/trackbacks/79781.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;tcp鍗忚鏈韓鏄彲闈犵殑,騫朵笉絳変簬搴旂敤紼嬪簭鐢╰cp鍙戦�佹暟鎹氨涓�瀹氭槸鍙潬鐨?涓嶇鏄惁闃誨,send鍙戦�佺殑澶у皬,騫朵笉浠ｈ〃瀵圭recv鍒板灝戠殑鏁版嵁.&nbsp;<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍦ㄩ樆濉炴ā寮忎笅, send鍑芥暟鐨勮繃紼嬫槸灝嗗簲鐢ㄧ▼搴忚姹傚彂閫佺殑鏁版嵁鎷瘋礉鍒板彂閫佺紦瀛樹腑鍙戦�佸茍寰楀埌紜鍚庡啀榪斿洖.浣嗙敱浜庡彂閫佺紦瀛樼殑瀛樺湪,琛ㄧ幇涓?濡傛灉鍙戦�佺紦瀛樺ぇ灝忔瘮璇鋒眰鍙戦�佺殑澶у皬瑕佸ぇ,閭ｄ箞send鍑芥暟绔嬪嵆榪斿洖,鍚屾椂鍚戠綉緇滀腑鍙戦�佹暟鎹?鍚﹀垯,send鍚戠綉緇滃彂閫佺紦瀛樹腑涓嶈兘瀹圭撼鐨勯偅閮ㄥ垎鏁版嵁,騫剁瓑寰呭绔‘璁ゅ悗鍐嶈繑鍥?鎺ユ敹绔彧瑕佸皢鏁版嵁鏀跺埌鎺ユ敹緙撳瓨涓?灝變細紜,騫朵笉涓�瀹氳絳夊緟搴旂敤紼嬪簭璋冪敤recv);&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍦ㄩ潪闃誨妯″紡涓?send鍑芥暟鐨勮繃紼嬩粎浠呮槸灝嗘暟鎹嫹璐濆埌鍗忚鏍堢殑緙撳瓨鍖鴻�屽凡,濡傛灉緙撳瓨鍖哄彲鐢ㄧ┖闂翠笉澶?鍒欏敖鑳藉姏鐨勬嫹璐?榪斿洖鎴愬姛鎷瘋礉鐨勫ぇ灝?濡傜紦瀛樺尯鍙敤絀洪棿涓?,鍒欒繑鍥?1,鍚屾椂璁劇疆errno涓篍AGAIN.&nbsp;<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linux涓嬪彲鐢╯ysctl -a | grep net.ipv4.tcp_wmem鏌ョ湅緋葷粺榛樿鐨勫彂閫佺紦瀛樺ぇ灝? net.ipv4.tcp_wmem = 4096 16384 81920 榪欐湁涓変釜鍊?絎竴涓�兼槸socket鐨勫彂閫佺紦瀛樺尯鍒嗛厤鐨勬渶灝戝瓧鑺傛暟,絎簩涓�兼槸榛樿鍊?璇ュ�間細琚玭et.core.wmem_default瑕嗙洊),緙撳瓨鍖哄湪緋葷粺璐熻澆涓嶉噸鐨勬儏鍐典笅鍙互澧為暱鍒拌繖涓�?絎笁涓�兼槸鍙戦�佺紦瀛樺尯絀洪棿鐨勬渶澶у瓧鑺傛暟(璇ュ�間細琚玭et.core.wmem_max瑕嗙洊). 鏍規嵁瀹為檯嫻嬭瘯,濡傛灉鎵嬪伐鏇存敼浜唍et.ipv4.tcp_wmem鐨勫�?鍒欎細鎸夋洿鏀圭殑鍊兼潵榪愯,鍚﹀垯鍦ㄩ粯璁ゆ儏鍐典笅,鍗忚鏍堥�氬父鏄寜net.core.wmem_default鍜宯et.core.wmem_max鐨勫�兼潵鍒嗛厤鍐呭瓨鐨?&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;搴旂敤紼嬪簭搴旇鏍規嵁搴旂敤鐨勭壒鎬у湪紼嬪簭涓洿鏀瑰彂閫佺紦瀛樺ぇ灝? socklen_t sendbuflen = 0; socklen_t len = sizeof(sendbuflen); getsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&amp;sendbuflen, &amp;len); printf("default,sendbuf:%d\n", sendbuflen); sendbuflen = 10240; setsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&amp;sendbuflen, len); getsockopt(clientSocket, SOL_SOCKET, SO_SNDBUF, (void*)&amp;sendbuflen, &amp;len); printf("now,sendbuf:%d\n", sendbuflen); 闇�瑕佹敞鎰忕殑鏄?铏界劧灝嗗彂閫佺紦瀛樿緗垚浜?0k,浣嗗疄闄呬笂,鍗忚鏍堜細灝嗗叾鎵╁ぇ1鍊?璁句負20k.&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-------------------瀹炰緥鍒嗘瀽--------------- <br>鍦ㄥ疄闄呭簲鐢ㄤ腑,濡傛灉鍙戦�佺鏄潪闃誨鍙戦�?鐢變簬緗戠粶鐨勯樆濉炴垨鑰呮帴鏀剁澶勭悊榪囨參,閫氬父鍑虹幇鐨勬儏鍐墊槸,鍙戦�佸簲鐢ㄧ▼搴忕湅璧鋒潵鍙戦�佷簡10k鐨勬暟鎹?浣嗘槸鍙彂閫佷簡2k鍒板绔紦瀛樹腑,榪樻湁8k鍦ㄦ湰鏈虹紦瀛樹腑(鏈彂閫佹垨鑰呮湭寰楀埌鎺ユ敹绔殑紜).閭ｄ箞姝ゆ椂,鎺ユ敹搴旂敤紼嬪簭鑳藉鏀跺埌鐨勬暟鎹負2k.鍋囧鎺ユ敹搴旂敤紼嬪簭璋冪敤recv鍑芥暟鑾峰彇浜?k鐨勬暟鎹湪澶勭悊,鍦ㄨ繖涓灛闂?鍙戠敓浜嗕互涓嬫儏鍐典箣涓�,鍙屾柟琛ㄧ幇涓?&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A. 鍙戦�佸簲鐢ㄧ▼搴忚涓簊end瀹屼簡10k鏁版嵁,鍏抽棴浜唖ocket: 鍙戦�佷富鏈轟綔涓簍cp鐨勪富鍔ㄥ叧闂�?榪炴帴灝嗗浜嶧IN_WAIT1鐨勫崐鍏抽棴鐘舵�?絳夊緟瀵規柟鐨刟ck),騫朵笖,鍙戦�佺紦瀛樹腑鐨?k鏁版嵁騫朵笉娓呴櫎,渚濈劧浼氬彂閫佺粰瀵圭.濡傛灉鎺ユ敹搴旂敤紼嬪簭渚濈劧鍦╮ecv,閭ｄ箞瀹冧細鏀跺埌浣欎笅鐨?k鏁版嵁(榪欎釜鍓嶉鏄?鎺ユ敹绔細鍦ㄥ彂閫佺FIN_WAIT1鐘舵�佽秴鏃跺墠鏀跺埌浣欎笅鐨?k鏁版嵁.), 鐒跺悗寰楀埌涓�涓绔痵ocket琚叧闂殑娑堟伅(recv榪斿洖0).榪欐椂,搴旇榪涜鍏抽棴.&nbsp;<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B. 鍙戦�佸簲鐢ㄧ▼搴忓啀嬈¤皟鐢╯end鍙戦�?k鐨勬暟鎹? 鍋囧鍙戦�佺紦瀛樼殑絀洪棿涓?0k,閭ｄ箞鍙戦�佺紦瀛樺彲鐢ㄧ┖闂翠負20-8=12k,澶т簬璇鋒眰鍙戦�佺殑8k,鎵�浠end鍑芥暟灝嗘暟鎹仛鎷瘋礉鍚?騫剁珛鍗寵繑鍥?192; 鍋囧鍙戦�佺紦瀛樼殑絀洪棿涓?2k,閭ｄ箞姝ゆ椂鍙戦�佺紦瀛樺彲鐢ㄧ┖闂磋繕鏈?2-8=4k,send()浼氳繑鍥?096,搴旂敤紼嬪簭鍙戠幇榪斿洖鐨勫�煎皬浜庤姹傚彂閫佺殑澶у皬鍊煎悗,鍙互璁や負緙撳瓨鍖哄凡婊?榪欐椂蹇呴』闃誨(鎴栭�氳繃select絳夊緟涓嬩竴嬈ocket鍙啓鐨勪俊鍙?,濡傛灉搴旂敤紼嬪簭涓嶇悊浼?绔嬪嵆鍐嶆璋冪敤send,閭ｄ箞浼氬緱鍒?1鐨勫�? 鍦╨inux涓嬭〃鐜頒負errno=EAGAIN.<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C. 鎺ユ敹搴旂敤紼嬪簭鍦ㄥ鐞嗗畬1k鏁版嵁鍚?鍏抽棴浜唖ocket: 鎺ユ敹涓繪満浣滀負涓誨姩鍏抽棴鑰?榪炴帴灝嗗浜嶧IN_WAIT1鐨勫崐鍏抽棴鐘舵�?絳夊緟瀵規柟鐨刟ck).鐒跺悗,鍙戦�佸簲鐢ㄧ▼搴忎細鏀跺埌socket鍙鐨勪俊鍙?閫氬父鏄?select璋冪敤榪斿洖socket鍙),浣嗗湪璇誨彇鏃朵細鍙戠幇recv鍑芥暟榪斿洖0,榪欐椂搴旇璋冪敤close鍑芥暟鏉ュ叧闂璼ocket(鍙戦�佺粰瀵規柟ack); 濡傛灉鍙戦�佸簲鐢ㄧ▼搴忔病鏈夊鐞嗚繖涓彲璇葷殑淇″彿,鑰屾槸鍦╯end,閭ｄ箞榪欒鍒嗕袱縐嶆儏鍐墊潵鑰冭檻,鍋囧鏄湪鍙戦�佺鏀跺埌RST鏍囧織涔嬪悗璋冪敤send,send灝嗚繑鍥?1,鍚屾椂errno璁句負ECONNRESET琛ㄧず瀵圭緗戠粶宸叉柇寮�,浣嗘槸,涔熸湁璇存硶鏄繘紼嬩細鏀跺埌SIGPIPE淇″彿,璇ヤ俊鍙風殑榛樿鍝嶅簲鍔ㄤ綔鏄��鍑鴻繘紼?濡傛灉蹇界暐璇ヤ俊鍙?閭ｄ箞send鏄繑鍥?1,errno涓篍PIPE(鏈瘉瀹?;濡傛灉鏄湪鍙戦�佺鏀跺埌RST鏍囧織涔嬪墠,鍒檚end鍍忓線甯鎬竴鏍峰伐浣? 浠ヤ笂璇寸殑鏄潪闃誨鐨剆end鎯呭喌,鍋囧send鏄樆濉炶皟鐢?騫朵笖姝ｅソ澶勪簬闃誨鏃?渚嬪涓�嬈℃�у彂閫佷竴涓法澶х殑buf,瓚呭嚭浜嗗彂閫佺紦瀛?,瀵圭socket鍏抽棴,閭ｄ箞send灝嗚繑鍥炴垚鍔熷彂閫佺殑瀛楄妭鏁?濡傛灉鍐嶆璋冪敤send,閭ｄ箞浼氬悓涓婁竴鏍?&nbsp;<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D. 浜ゆ崲鏈烘垨璺敱鍣ㄧ殑緗戠粶鏂紑: 鎺ユ敹搴旂敤紼嬪簭鍦ㄥ鐞嗗畬宸叉敹鍒扮殑1k鏁版嵁鍚?浼氱戶緇粠緙撳瓨鍖鴻鍙栦綑涓嬬殑1k鏁版嵁,鐒跺悗灝辮〃鐜頒負鏃犳暟鎹彲璇葷殑鐜拌薄,榪欑鎯呭喌闇�瑕佸簲鐢ㄧ▼搴忔潵澶勭悊瓚呮椂.涓�鑸仛娉曟槸璁懼畾涓�涓猻elect絳夊緟鐨勬渶澶ф椂闂?濡傛灉瓚呭嚭榪欎釜鏃墮棿渚濈劧娌℃湁鏁版嵁鍙,鍒欒涓簊ocket宸蹭笉鍙敤. 鍙戦�佸簲鐢ㄧ▼搴忎細涓嶆柇鐨勫皢浣欎笅鐨勬暟鎹彂閫佸埌緗戠粶涓?浣嗗緇堝緱涓嶅埌紜,鎵�浠ョ紦瀛樺尯鐨勫彲鐢ㄧ┖闂存寔緇負0,榪欑鎯呭喌涔熼渶瑕佸簲鐢ㄧ▼搴忔潵澶勭悊. 濡傛灉涓嶇敱搴旂敤紼嬪簭鏉ュ鐞嗚繖縐嶆儏鍐佃秴鏃剁殑鎯呭喌,涔熷彲浠ラ�氳繃tcp鍗忚鏈韓鏉ュ鐞?鍏蜂綋鍙互鏌ョ湅sysctl欏逛腑鐨? net.ipv4.tcp_keepalive_intvl net.ipv4.tcp_keepalive_probes net.ipv4.tcp_keepalive_time 
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