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iqm id:iqm

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Linuxã‚«ãƒ¼ãƒãƒ«3.13ãƒªãƒªãƒ¼ã‚¹ã€nftablesã‚„ãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ãƒ¬ã‚¤ãƒ¤ãƒ¼ã®æ”¹è‰¯ãªã©ãŒç‰¹å¾´ | OSDN Magazine
Linus Torvaldsæ°ã¯1æœˆ19æ—¥ã€ã€ŒLinuxã‚«ãƒ¼ãƒãƒ«3.13ã€ã‚’ãƒªãƒªãƒ¼ã‚¹ã—ãŸã€‚å¤§ããªå¤‰æ›´ç‚¹ã¨ã—ã¦ã¯ãƒ‘ã‚±ãƒƒãƒˆãƒ•ã‚£ãƒ«ã‚¿ãƒªãƒ³ã‚°æ©Ÿèƒ½ã€Œiptablesã€ã®å¾Œç¶™ã¨ãªã‚‹ã€Œnftablesã€ã®ãƒžãƒ¼ã‚¸ã‚„ã€SSDãªã©ã®é«˜é€Ÿãƒ‡ãƒã‚¤ã‚¹ã‚’è€ƒæ…®ã—ãŸã‚¹ã‚±ãƒ¼ãƒ©ãƒ–ãƒ«ãªãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ãƒ¬ã‚¤ãƒ¤ãƒ¼ã®å°Žå…¥ãªã©ãŒæŒ™ã’ã‚‰ã‚Œã‚‹ã€‚ 11æœˆåˆã‚ã«å…¬é–‹ã•ã‚ŒãŸãƒãƒ¼ã‚¸ãƒ§ãƒ³3.12ã‹ã‚‰ç´„11é€±é–“ã§ã®æ–°ãƒãƒ¼ã‚¸ãƒ§ãƒ³å…¬é–‹ã¨ãªã‚Šã€åˆå›žã®ãƒªãƒªãƒ¼ã‚¹å€™è£œï¼ˆRCï¼‰ç‰ˆãŒ11æœˆæœ«ã«å…¬é–‹ã•ã‚Œã¦ä»¥æ¥ã€åˆè¨ˆ8å›žã®RCãƒªãƒªãƒ¼ã‚¹ã‚’çµŒã¦æ£å¼ç‰ˆãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸã€Torvaldsæ°ã«ã‚ˆã‚‹ã¨ã€ã€Œæ—…è¡ŒãŒã‚ã£ãŸãŸã‚ã«ãƒªãƒªãƒ¼ã‚¹ãŒ1é€±é–“é…ã‚ŒãŸã€ã¨ã„ã†ã€‚ ä»Šå›žã®ãƒªãƒªãƒ¼ã‚¹ã«ãŠã‘ã‚‹é‡è¦ãªå¤‰æ›´ç‚¹ã¨ã—ã¦ã¯ã€ã¾ãšSSDã‚’è¦–é‡Žã«ã„ã‚ŒãŸã‚¹ã‚±ãƒ¼ãƒ©ãƒ–ãƒ«ãªãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ãƒ¬ã‚¤ãƒ¤ãƒ¼ã®å°Žå…¥ãŒæŒ™ã’ã‚‰ã‚Œã¦ã„ã‚‹ã€‚I/Oå—ä»˜ã®ãŸã‚ã®CPUå˜ä½ã§ã®ã‚ãƒ¥ãƒ¼ã¨ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢å‘ã‘ã®ã‚ãƒ¥ãƒ¼ã¨ã„ã†2ãƒ¬ãƒ™ãƒ«ã§ã®ã‚ãƒ¥ãƒ¼æ§‹é€ ã‚’æŒã¡ã€
iqm 2014/01/22
linux

kernel

nftables
ãƒªãƒ³ã‚¯
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

network
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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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linux

kernel

network
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Linuxã‚«ãƒ¼ãƒãƒ«3.9ãƒªãƒªãƒ¼ã‚¹ã€SSDã‚’ã‚ãƒ£ãƒƒã‚·ãƒ¥ã¨ã—ã¦åˆ©ç”¨ã™ã‚‹ã€Œdm-cacheã€ã‚„Andcroidã‚¨ãƒŸãƒ¥ãƒ¬ãƒ¼ã‚¿æ©Ÿèƒ½ãªã©ã‚’æ–°ãŸã«æè¼‰ | OSDN Magazine
Linus Torvaldsæ°ã¯4æœˆ29æ—¥ã€Linuxã‚«ãƒ¼ãƒãƒ«3.9ã®ãƒªãƒªãƒ¼ã‚¹ã‚’ç™ºè¡¨ã—ãŸã€‚SSDã‚’ãƒãƒ¼ãƒ‰ãƒ‡ã‚£ã‚¹ã‚¯ã®ã‚ãƒ£ãƒƒã‚·ãƒ¥ã¨ã—ã¦åˆ©ç”¨ã§ãã‚‹ã€Œdm-cacheã€ã‚„ã€æ–°ã—ã„çœé›»åŠ›ãƒ¢ãƒ¼ãƒ‰ã®è¿½åŠ ã€Androidç’°å¢ƒã®ã‚¨ãƒŸãƒ¥ãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ç’°å¢ƒãªã©ãŒåŠ ã‚ã£ã¦ã„ã‚‹ã€‚ 2æœˆå¾ŒåŠã«ãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸLinuxã‚«ãƒ¼ãƒãƒ«3.8ã‹ã‚‰10é€±é–“ã§ã®æœ€æ–°ç‰ˆãƒªãƒªãƒ¼ã‚¹ã¨ãªã‚Šã€Brtfsã§ã®RAID 5/6ã‚µãƒãƒ¼ãƒˆã‚„SSDã‚ãƒ£ãƒƒã‚·ãƒ¥ãƒ‡ãƒã‚¤ã‚¹ã‚µãƒãƒ¼ãƒˆã€Androidã‚¨ãƒŸãƒ¥ãƒ¬ãƒ¼ã‚¿æ©Ÿèƒ½ã€ã„ãã¤ã‹ã®æ–°ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã‚µãƒãƒ¼ãƒˆã®è¿½åŠ ã€çœé›»åŠ›æ©Ÿèƒ½ã®å¼·åŒ–ãªã©ãŒç‰¹å¾´ã¨ãªã‚‹ã€‚ Brtfsã§ã¯å¾“æ¥RAID 0/1ã®ã‚µãƒãƒ¼ãƒˆã®ã¿ãŒè¡Œã‚ã‚Œã¦ã„ãŸãŒã€ä»Šå›žæ–°ãŸã«RAID 5ãŠã‚ˆã³6ã®å®Ÿé¨“çš„ã‚µãƒãƒ¼ãƒˆãŒåŠ ã‚ã£ãŸã€‚ãŸã ã—ã‚¯ãƒ©ãƒƒã‚·ãƒ¥ã‚»ãƒ¼ãƒ•ã§ã¯ãªã„ãŸã‚ã€ãƒ†ã‚¹ãƒˆç›®çš„ã§ã®å®Ÿè£…ã¨ã„ã†ã‚¹ãƒ†ãƒ¼ã‚¿ã‚¹ã¨ã®ã“ã¨ã€‚ã¾ãŸã€ã‚¹ãƒŠãƒƒãƒ—ã‚·ãƒ§ãƒƒãƒˆæƒ…å ±ã‚’æ„è˜ã—ãŸãƒ‡ãƒ•ãƒ©ã‚°ï¼ˆSnapshot-aware
iqm 2013/05/07
linux

kernel
ãƒªãƒ³ã‚¯
KSMå†…éƒ¨è§£æž - KVMæ—¥è¨˜
æ¦‚è¦ KSM(Kernel SamePage Merging)ã¨ã¯ã€ãƒ¦ãƒ¼ã‚¶ãƒ—ãƒã‚»ã‚¹ã®ãƒ¡ãƒ¢ãƒªé ˜åŸŸã‚’èµ°æŸ»ã—ã¦ã€åŒä¸€å†…å®¹ã®ãƒšãƒ¼ã‚¸ã‚’1ã¤ã®ãƒšãƒ¼ã‚¸ã«ãƒžãƒ¼ã‚¸ã™ã‚‹ã“ã¨ã§ä½¿ç”¨ãƒ¡ãƒ¢ãƒªé‡ã‚’å‰Šæ¸›ã™ã‚‹Linuxã‚«ãƒ¼ãƒãƒ«ã®æ©Ÿèƒ½ã§ã™ã€‚ãƒžãƒ¼ã‚¸ã•ã‚ŒãŸãƒšãƒ¼ã‚¸ã¯CoW(Copy on Write)çŠ¶æ…‹ã«è¨å®šã•ã‚Œã€ãƒšãƒ¼ã‚¸ã¸ã®æ›¸ãè¾¼ã¿ãŒç™ºç”Ÿã™ã‚‹ã¨å†ã³å€‹åˆ¥ã®ãƒšãƒ¼ã‚¸ã«åˆ†è£‚ã•ã‚Œã¾ã™ã€‚ KSMã¯ãƒãƒ¼ã‚¸ãƒ§ãƒ³2.6.32ã§ãƒžãƒ¼ã‚¸ã•ã‚Œã€ä¸»ã«åŒä¸€å†…å®¹ã®ãƒšãƒ¼ã‚¸ã‚’é‡è¤‡ã—ã¦æŒã¤å¯èƒ½æ€§ãŒæ¯”è¼ƒçš„å¤šã„VMåˆ©ç”¨æ™‚ã®ä½¿ç”¨ãƒ¡ãƒ¢ãƒªå‰Šæ¸›ãŒæœŸå¾…ã•ã‚Œã¦ã„ã¾ã™ã€‚ ã“ã®è¨˜äº‹ã¯KSMã®å†…éƒ¨æ§‹é€ ã¨å‹•ä½œã‚’è§£æžã™ã‚‹ã‚‚ã®ã§ã™ã€‚ å¿™ã—ã„äººã®ãŸã‚ã®è§£æžæ¦‚ç•¥ ãƒ¦ãƒ¼ã‚¶ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã¯madvise(ã®æ–°ã—ã„ã‚ªãƒ—ã‚·ãƒ§ãƒ³MADV_MERGEABLEã¨MADV_UNMERGEABLE)ã¨/sys/kernel/mm/ksm/ä»¥ä¸‹ã®sysfsãƒ•ã‚¡ã‚¤ãƒ« ãƒ¦ãƒ¼ã‚¶ãƒ—ãƒã‚»ã‚¹ãŒmadviseã§ãƒžãƒ¼ã‚¸ã—ã¦ã‚‚è‰¯ã„
iqm 2013/04/09
kvm

linux

kernel
ãƒªãƒ³ã‚¯
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
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iqm 2012/11/14
linux

kernel

network
ãƒªãƒ³ã‚¯
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
ãƒªãƒ³ã‚¯
2012 å¹´ 7 æœˆ 1 æ—¥ã®ã†ã‚‹ã†ç§’æŒ¿å…¥æ™‚ã«ç™ºç”Ÿã—ãŸ Linux ã‚«ãƒ¼ãƒãƒ«ã®ä¸å…·åˆã«é–¢ã™ã‚‹æƒ…å ±
æ›´æ–°å±¥æ´ 2012-08-28: URL å…¬é–‹ 2012-08-29: futexã€hrtimerã€MySQL ã®ç™ºç”Ÿæ¡ä»¶ã€NTP SLEW ãƒ¢ãƒ¼ãƒ‰ã«é–¢ã™ã‚‹ @odhrfm ã•ã‚“ã‹ã‚‰ã®æƒ…å ±ã€ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰æ›´æ–°ã€ãã®ä»–ã„ã‚ã„ã‚ç´°ã‹ã„ä¿®æ£ 2012-08-30: å‚è€ƒãƒªãƒ³ã‚¯è¿½åŠ 2012-09-01: LKML ã¾ã¨ã‚ã‚·ãƒ¼ãƒˆã® thread#50 ã‚’è¿½åŠ 2012-09-03: SLES ã‚«ãƒ¼ãƒãƒ«ã®æ›´æ–°æƒ…å ±ã€per-cpu ã«ã¤ã„ã¦ã®è¨˜è¿°ã€blockdiag ã«ã‚ˆã‚‹ãƒ–ãƒãƒƒã‚¯å›³ã‚’è¿½åŠ 2012-09-11: LKML ã¾ã¨ã‚ã‚·ãƒ¼ãƒˆã® thread#52, #53 ã‚’è¿½åŠ 2012-09-12: LKML ã¾ã¨ã‚ã‚·ãƒ¼ãƒˆã® thread#54 ã€œ #58 ã‚’è¿½åŠ ã¯ã˜ã‚ã« æ—¥æœ¬æ™‚é–“ 2012 å¹´ 7 æœˆ 1 æ—¥ 9:00 ã«ã†ã‚‹ã†ç§’ãŒæŒ¿å…¥ã•ã‚Œã¾ã—ãŸãŒã€ãã®éš› Linux ã‚«ãƒ¼ãƒãƒ«ã«èµ·å› ã™ã‚‹ä¸å…·åˆã«ã‚ˆã‚Šã€
iqm 2012/08/29
kernel

linux
ãƒªãƒ³ã‚¯
insmod: error inserting 'hoge.ko': -1 Invalid module formatå¯¾å‡¦ - C_memo(5)
modinfoã§ã€hoge.koã‚’è¦‹ã‚‹ã€‚ vermagicã‚’ãƒã‚§ãƒƒã‚¯ã™ã‚‹ã€‚ Makefileã‚’è¦‹ã‚‹ã€‚ ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¨ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãƒãƒ¼ã‚¸ãƒ§ãƒ³ãŒä¸€è‡´ã™ã‚‹ã‹ç¢ºèªã™ã‚‹ã€‚ ä¸€è‡´ã—ãªã‘ã‚Œã°ã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³ãƒã‚§ãƒƒã‚¯ã‚’ã‚†ã‚‹ãã™ã‚‹ã‚«ãƒ¼ãƒãƒ«ã‚³ãƒ³ãƒ•ã‚£ã‚°ãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ãŒã‚ã‚‹ã®ã§ã€ãã‚Œã‚’æŽ¢ã™ã€‚
iqm 2012/07/13
ã¾ãšã¯modinfoã§ãƒã‚§ãƒƒã‚¯

linux

kernel
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code search
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iqm 2012/07/11
linux

kernel

search
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sched_clock() overflow after 208.5 days in Linux Kernel
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iqm 2012/03/26
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iqm 2012/03/21
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iqm 2012/03/21
openvswitch

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iqm 2012/01/23
android

linux

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iqm 2012/01/23
android

linux

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iqm 2012/01/16
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KMC Staff Blog:exitã¨_exitã®é•ã„/tmpfileã®å‰Šé™¤ã®ã—ãã¿
2011å¹´02æœˆ17æ—¥ exitã¨_exitã®é•ã„/tmpfileã®å‰Šé™¤ã®ã—ãã¿ Linuxã§ã®ãƒ—ãƒã‚»ã‚¹ã®çµ‚äº†å‡¦ç†ã«ã¤ã„ã¦å°‘ã—èª¿ã¹ã¾ã—ãŸã€‚ ä»Šã¾ã§ã‚ã¾ã‚Šæ„è˜ã—ã¦ã„ãªã‹ã£ãŸexitã¨_exitã®é•ã„ã‚‚ç†è§£ã§ãã¾ã—ãŸã€‚ æ˜”Cè¨€èªžã§å°ã•ãªãƒžã‚¤ã‚³ãƒ³ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’ã—ã¦ã„ãŸé ƒã¯ã€ä¸€åº¦mainé–¢æ•°ã‚’å®Ÿè¡Œã™ã‚‹ã¨ã€ãã“ã‹ã‚‰æŠœã‘ã‚‹ã“ã¨ã¯ãªã‹ã£ãŸã®ã§ã€mainé–¢æ•°ã‚’æŠœã‘ãŸå¾Œã®ã“ã¨ã¯ã‚ã¾ã‚Šæ„è˜ã™ã‚‹ã“ã¨ã¯ã‚ã‚Šã¾ã›ã‚“ã§ã—ãŸã€‚ ã—ã‹ã—ã€Linuxãªã©ãƒ—ãƒã‚»ã‚¹å˜ä½ã§å‹•ã‹ã™å ´åˆã«ã¯ã€mainé–¢æ•°ã‚’æŠœã‘ãŸå¾Œã®çµ‚äº†å‡¦ç†ã‚‚ç†è§£ã—ã¦ãŠãå¿…è¦ãŒã‚ã‚‹ã¨æ€ã„ã¾ã™ã€‚ mainé–¢æ•°ã¨exitã®é–¢ä¿‚ mainé–¢æ•°ã¯ã‚¹ã‚¿ãƒ¼ãƒˆã‚¢ãƒƒãƒ—ãƒ«ãƒ¼ãƒãƒ³ã‹ã‚‰å‘¼ã³å‡ºã•ã‚Œã¾ã™ãŒã€mainã‹ã‚‰æˆ»ã£ãŸå¾Œã«mainé–¢æ•°ã®æˆ»ã‚Šå€¤ã‚’å¼•æ•°ã¨ã—ã¦exitãŒå‘¼ã³å‡ºã•ã‚Œã¾ã™ã€‚ ã¤ã¾ã‚Šã€ exit(main(argc, argv, env)); (ã¡ãªã¿ã«ã€mainã¨ã„ã†åå‰ã®é–¢æ•°ã¯
iqm 2011/02/17
linux

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iqm 2011/02/09
linux

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top ã¯ãªãœ vmstat ã‚ˆã‚Šè² è·ãŒé«˜ã„ã®ã‹ - ablog
top ã¯ vmstat ã«æ¯”ã¹ã¦è² è·ãŒã‹ã‹ã‚‹ã¨è¨€ã„ã¾ã™ãŒã€å…·ä½“çš„ã«ä½•ãŒé•ã†ã®ã‹ã¡ã‚‡ã£ã¨èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ ã‚ªãƒ¼ãƒ—ãƒ³ã™ã‚‹ãƒ—ãƒã‚»ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ï¼ˆ/procï¼‰ã®ãƒ•ã‚¡ã‚¤ãƒ«ãŒé•ã†æ°—ãŒã™ã‚‹ã®ã§ã€strace ã§èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ vmstat ãŒã‚ªãƒ¼ãƒ—ãƒ³ã—ã¦ã„ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚’èª¿ã¹ã‚‹ã€‚ % strace -e open vmstat 1 1 open("/etc/ld.so.cache", O_RDONLY) = 3 open("/lib/libproc-3.2.7.so", O_RDONLY) = 3 open("/lib/libc.so.6", O_RDONLY) = 3 open("/proc/stat", O_RDONLY) = 3 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r
iqm 2010/12/21
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iqm 2009/04/12
linux

kernel
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