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Linuxã®TCP SYNã®å†é€é–“éš”ã®åˆæœŸå€¤ãŒ3ç§’ã‹ã‚‰1ç§’ã«å¤‰æ›´ã•ã‚Œã¦ã„ãŸ - å…ƒRX-7ä¹—ã‚Šã®é©å½“ãªæ—¥ã€…
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iqm 2013/11/29
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linux

kernel

TCP

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Linux kernel 3.9 ã®æ–°æ©Ÿèƒ½ SO_REUSEPORT ã‚’è©¦ã—ã¦ã¿ã‚‹ - nigakyã®ãƒ–ãƒã‚°
Linux kernel 3.9 ã®ãƒžãƒ¼ã‚¸ã‚¦ã‚£ãƒ³ãƒ‰ã‚¦ã§ã¯ SO_REUSEPORT ã¨ã„ã†ã‚½ã‚±ãƒƒãƒˆã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒãƒžãƒ¼ã‚¸ã•ã‚Œã¾ã—ãŸã€‚ Merge branch 'soreuseport' Â· c617f39 Â· torvalds/linux Â· GitHub ã“ã‚Œã¯åŒä¸€ãƒãƒ¼ãƒˆã«è¤‡æ•°ã®ãƒªã‚¹ãƒŠãƒ¼ï¼ˆlisten ã‚½ã‚±ãƒƒãƒˆï¼‰ãŒ bind ã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã¨ã„ã†ã‚‚ã®ã§ã€Webã‚µãƒ¼ãƒãªã©å˜ä¸€ã®ãƒãƒ¼ãƒˆã«å¤šãã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒæ¥ã‚‹ã‚ˆã†ãªãƒ¯ãƒ¼ã‚¯ãƒãƒ¼ãƒ‰ã§ã€è¤‡æ•°ãƒ—ãƒã‚»ã‚¹ã§ã†ã¾ãè² è·åˆ†æ•£ãŒã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ãã†ã§ã™ã€‚ ï¼ˆã“ã‚Œã¾ã§ã ã¨ä¸€äººãŒaccept()ã—ã¦ãã‚Œãžã‚Œã® worker ã«æ¸¡ã™ã¨ã„ã†ã‚ˆã†ãªãƒ¢ãƒ‡ãƒ«ãŒã‚ã‚Šã¾ã—ãŸãŒã€ã“ã‚Œã§ã¯ accept() ã™ã‚‹éƒ¨åˆ†ãŒãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã«ãªã£ã¦ã—ã¾ã„ãŒã¡ã§ã—ãŸã€‚ï¼‰ BSDã§ã¯å…ƒã€… SO_REUSEPORT ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ã‚ã£ãŸã‚ˆã†ã§ã™ãŒã€ãƒžãƒ«ãƒã‚ãƒ£ã‚¹ãƒˆé€šä¿¡ã§ä½¿ã†ã‚‚ã®ã®ã‚ˆã†ã§ã™ã€‚Linux
iqm 2013/05/17
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CentOS 6.2 ã§ RPS/RFS ã‚’ä½¿ã£ã¦ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®å‰²ã‚Šè¾¼ã¿å‡¦ç†ã‚’è¤‡æ•°ã‚³ã‚¢ã«åˆ†æ•£ã—ã¦ã¿ãŸ - blog.nomadscafe.jp
ä»¥å‰(2010å¹´)ã«ã€Œã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã§ã‚‚ãƒžãƒ«ãƒã‚³ã‚¢CPUã‚’æ´»ã‹ã›ãªã„ä»¶ã€ã¨ã„ã†ã‚¨ãƒ³ãƒˆãƒªã«ã¦CPUã®ã‚³ã‚¢ãŒå¢—ãˆã¦ã‚‚å‰²ã‚Šè¾¼ã¿å‡¦ç†ãŒåˆ†æ•£ã•ã‚Œãªã„ã®ã§ã‚¹ã‚±ãƒ¼ãƒ«ã•ã‚Œãªã„ã¨æ›¸ã„ãŸã‘ã©ã€ãã®å¾ŒLinux Kernelã«RPS/RFSãªã‚‹æ©Ÿèƒ½ãŒè¿½åŠ ã•ã‚Œã€å‰²ã‚Šè¾¼ã¿å‡¦ç†ãŒåˆ†æ•£ã§ãã‚‹ã‚ˆã†ã«ãªã‚Šã€CentOS 6.2 ã§ã‚‚ä½¿ãˆã‚‹ã‚‰ã—ã„ã®ã§è©¦ã—ã¦ã¿ã¾ã—ãŸã€‚ RPS/RFSã«ã¤ã„ã¦ã®ç´¹ä»‹ã¯ VIOPS06ã§ã€ŒRPSãƒ»RFSç‰æœ€æ–°Linux Kerneläº‹ä¾‹ã€ã¨é¡Œã—ã¦ãŠè©±ã—ã¦ãã¾ã—ãŸ http://d.hatena.ne.jp/syuu1228/20110722/1311322653 Linuxå†…æ ¸ RPS/RFSåŠŸèƒ½è¯¦ç»†æµ‹è¯•åˆ†æž http://www.igigo.net/archives/204 ãŒè©³ã—ã„ã€‚2ç•ªç›®ã®ã¯ã»ã¼èªã‚ãªã„ã‘ã©ã€æ€§èƒ½æ¯”è¼ƒã®ã‚°ãƒ©ãƒ•ãŒåˆ†ã‹ã‚Šã‚„ã™ã„ã€‚ ä»Šå›žè©¦ã—ãŸã‚µãƒ¼ãƒã¯ã€ OS: C
iqm 2012/11/14
linux

kernel

network
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ã‚¤ãƒžãƒ‰ã‚ãªNetwork/IO
The document discusses techniques for improving network and I/O performance between the network interface card (NIC) and CPU. It describes techno logies like TCP offloading, receive side scaling, and Intel I/O acceleration features that distribute processing load away from the CPU to improve throughput and reduce latency. Optimization goals include more efficiently handling interrupts and direct me
iqm 2012/10/30
Linux

kernel

Network
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tcpflow ãŒæ¥½ã—ã„ - lql.be::hateda
ãƒ‘ã‚±ãƒƒãƒˆã®ä¸èº«ã‚’è¦‹ã‚‹ã‚³ãƒžãƒ³ãƒ‰ã¨ã—ã¦ tcpdump ãŒæœ‰åã ã‘ã©ã€æœ€è¿‘ tcpflow ã£ã¦ã„ã†ã‚³ãƒžãƒ³ãƒ‰ãŒã‚ã‚‹ã“ã¨ã‚’çŸ¥ã£ãŸã€‚ tcpflow ã¯ tcpdump ã¨æ¯”ã¹ã¦ãƒ‘ã‚±ãƒƒãƒˆã®ä¸èº«ã‚’ã‚ˆã‚Šè¦‹ã‚„ã™ãã—ã¦ãã‚Œã¦å¤§å¤‰ã™ã°ã‚‰ã—ã„æ„Ÿã˜ã€‚ debian ç’°å¢ƒã ã‘ã©ã€ä½™è£•ã® aptitude ã§ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã§ãã‚‹ã€‚ # aptitude install tcpflowcentos ã¨ã‹ã ã¨ rpmfoge ãƒ¬ãƒã‚¸ãƒˆãƒªã«ã‚ã‚‹ã¿ãŸã„ã€‚ ã¨ã‚Šã‚ãˆãšä½¿ã£ã¦ã¿ã‚‹ # tcpflow -cc ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ã€ã‚³ãƒ³ã‚½ãƒ¼ãƒ«ã«å†…å®¹ã‚’è¡¨ç¤ºã—ã¦ãƒã‚°ã‚’ä¿å˜ã—ãªã„ã‚ˆã†ã«ã™ã‚‹ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã§ã“ã‚Œã¤ã‘ãªã„ã§ã€ã†ã£ã‹ã‚Šèµ·å‹•ã•ã›ã‚‹ã¨ã‚«ãƒ¬ãƒ³ãƒˆãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªãŒæ®‹å¿µãªã“ã¨ã«ãªã‚‹ ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ã‚¤ã‚¹ã‚’æŒ‡å®šã—ã¦èµ·å‹• # tcpflow -c -i eth0ã“ã‚Œã§ eth0 ã«æµã‚Œã‚‹ãƒ‘ã‚±ãƒƒãƒˆã‚’è¦‹ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ è‰²ã¤ã‘ã¦ãƒã‚°ã‚’è¦‹ã‚„ã™ãã™ã‚‹ # tcpflo
iqm 2012/03/27
linux

network
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iqm 2010/11/10
linux

TCP

network
ãƒªãƒ³ã‚¯
Linuxä¸Šã®pingã‚³ãƒžãƒ³ãƒ‰ã§çµŒè·¯ä¸Šã®MTUã‚’èª¿ã¹ã‚‹
RHEL/CentOSã€Xenã‚’ä¸å¿ƒã«ãƒ¡ãƒ¢ã‚’æ®‹ã—ã¦ã„ãã¾ã™ã€‚å†…å®¹ã¯ç„¡ä¿è¨¼ã€‚é©ç”¨ã™ã‚‹å ´åˆã¯ã€ååˆ†ç¢ºèªã®ä¸Šã€è‡ªå·±è²¬ä»»ã§ã€‚ æŒ‡æ‘˜ã€è³ªå•ã€è¦æœ›ã‚’ã‚³ãƒ¡ãƒ³ãƒˆã—ã¦ã‚‚ã‚‰ãˆã‚‹ã¨å–œã³ã¾ã™ã€‚ @ITã®è¨˜äº‹ã€Žpingã§MTUã‚µã‚¤ã‚ºã‚’èª¿æŸ»ã™ã‚‹ã€ã¨åŒã˜ã“ã¨ã‚’Linuxã§ã‚„ã‚‹æ–¹æ³•ã€‚ã¤ã¾ã‚Šã¯ã€Linuxã®pingã‚³ãƒžãƒ³ãƒ‰ã§ãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒˆç¦æ¢ã‚’æŒ‡å®šã™ã‚‹ã«ã¯ã©ã†ã™ã‚Œã°ã„ã„ã‹ã€ã¨ã„ã†ã“ã¨ã€‚ç°¡å˜ã«è¨€ã†ã¨ã€-M hintã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ä½¿ç”¨ã™ã‚‹ã€‚ã¾ãšã¯ã€å®Ÿè¡Œçµæžœã‚’ã”è¦§ã‚ã‚Œã€‚è§£ã‚‹äººã«ã¯ã“ã‚Œã ã‘ã§è§£ã‚‹ã ã‚ã†ã€‚$ ping -c 1 -s 1500 192.168.55.7 PING 192.168.55.7 (192.168.55.7) 1500(1528) bytes of data. 1508 bytes from 192.168.55.7 (192.168.55.7): icmp_seq=1 ttl=255 time=4.64 ms
iqm 2009/11/04
linux

network
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vconfig ãƒ¡ãƒ¢
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iqm 2009/10/22
VLANè¨å®š

linux

network

VLAN
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[CentOS] ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã‚’æ§‹æˆã™ã‚‹
09/04/16 å¤§å¹…ã«ä¿®æ£ è¤‡æ•°ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ã‚¤ã‚¹ã‚’æŸãã¦å†—é•·æ€§ã‚„è² è·åˆ†æ•£ã‚’è¡Œã†æŠ€è¡“ã‚’ã€Linuxã§ã¯ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã¨å‘¼ã°ã‚Œã‚‹ãƒ‰ãƒ©ã‚¤ãƒã«ã‚ˆã‚Šå®Ÿç¾ã—ã¦ã„ã¾ã™ã€‚CentOSã§ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã‚’æ§‹æˆã—ãŸã¨ãã®ãƒ¡ãƒ¢ã€‚ CentOS 5.2ã«ã¦ãƒ†ã‚¹ãƒˆã—ã¾ã—ãŸãŒRed Hatç³»ã®ãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã§ã‚ã‚Œã°é©ç”¨ã§ãã‚‹ã‹ã¨æ€ã‚ã‚Œã¾ã™ã€‚ ç’°å¢ƒ CentOS 5.2 on VMware Server 1.0.6 ä»®æƒ³NIC Ã— 2 ãƒ›ã‚¹ãƒˆãƒžã‚·ãƒ³æè¼‰ç‰©ç†NICæ•°: 3 æ§‹æˆã—ã¦ã¿ã‚‹ ã“ã“ã§ã€eth0, eth1ã®ã‚ˆã†ã«ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ‡ãƒã‚¤ã‚¹ãŒã™ã§ã«åˆ©ç”¨ã§ãã‚‹çŠ¶æ³ã«ãªã£ã¦ã„ã‚‹ã“ã¨ãŒå‰æã¨ãªã‚Šã¾ã™ã€‚ eth0ã¨eth1ã‚’ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã—ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ‡ãƒã‚¤ã‚¹bond0ã‚’ã€eth2ã¨eth3ã‚’ãƒœãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã—ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ‡ãƒã‚¤ã‚¹bond1ã‚’ç”Ÿæˆã™ã‚‹å ´åˆã®æ‰‹é †ã¯ä»¥ä¸‹ã®é€šã‚Šã€‚ 1. /etc/modprobe.d/
iqm 2009/05/20
linux

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network
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http://blog.dc-d.jp/archives/290.html
iqm 2009/05/20
linux

network
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