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IBM Developer
IBM Developer is your one-stop location for getting hands-on training and learning in-demand skills on relevant techno logies such as generative AI, data science, AI, and open source.
potato777 2017/09/19
tcp
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NGINX 1.9ãŒæ±Žç”¨TCPã‚µãƒ¼ãƒã¨ã—ã¦ä½¿ãˆã‚‹ã‚ˆã†ã«ãªã£ã¦ã„ãŸä»¶ - Qiita
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potato777 2016/02/14
nginx

TCP
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Mobile TCP optimization - lessons learned in production
I did a keynote presentation at the SIGCOMM'15 HotMiddlebox workshop, "Mobile TCP optimization - Lessons Learned in Production". The title was set before I had any idea of what I'd really be talking about, just that it'd be about some of the stuff we've been working on at Teclo. So apologies if the content isn't an exact match for the title. This post contains my slides, interleaved with my speake
potato777 2015/08/26
TCP

Teclo
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oreilly.com
New! Oâ€™Reilly announces launch of the AI Academy. Read now Introducing the AI Academy Help your entire org put GenAI to work Every employee today needs to know how to prompt GenAI, use it to enhance critical thinking and productivity, and more. With the AI Academy they can. For less. Oâ€™Reilly AI-powered Answers just got even smarter Oâ€™Reilly Answers instantly generates information teams can trust,
potato777 2015/03/06
TCP
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mTCPä½¿ã£ã¦ã¿ãŸ
mTCP enables high-performance userspace TCP/IP stacks by bypassing the kernel and reducing system call overhead. It was shown to achieve up to 25x higher throughput than Linux for short flows. The document discusses porting the iperf benchmark to use mTCP, which required only minor changes. Performance tests found that mTCP-ified iperf achieved similar throughput as Linux iperf for different packe
potato777 2015/01/01
TCP
ãƒªãƒ³ã‚¯
Linuxã§TCP_DEFER_ACCEPTãŒæœ‰åŠ¹ã§ã‚‚acceptå¾Œreadã§ããªã„ç†ç”±
listen()ã®backlogãŒä¸è¶³ã—ãŸéš›ã®TCP_DEFER_ACCEPTã®å‹•ä½œã«ã¤ã„ã¦ - blog.nomadscafe.jpã¨ã„ã†è¨˜äº‹ã®ä¸ã§ã€listen backlog ãŒã‚ãµã‚ŒãŸå¾Œã« accept(2) ã™ã‚‹ã¨ã€ãã®å¾Œã® read(2) ãŒ EAGAIN ã‚’è¿”ã—ãŸã‚Šã€æŽ¥ç¶šãŒä¸å®‰å®šã«ãªã‚‹ã¨ã„ã†äº‹è±¡ãŒèª¬æ˜Žã•ã‚Œã¦ã„ã¾ã—ãŸã€‚æ°—ã«ãªã£ãŸã®ã§èª¿ã¹ã¦ã¿ãŸã“ã¨ã‚’ã¾ã¨ã‚ã¾ã™ã€‚ çµè«–ã‹ã‚‰è¨€ã†ã¨ã“ã‚Œã¯Linuxã®ä»•æ§˜ã§ã™ã€‚manã®tcp(7)ã‚’è¦‹ã‚‹ã¨ã€ TCP_DEFER_ACCEPT (since Linux 2.4) Allow a listener to be awakened only when data arrives on the socket. Takes an integer value (seconds), this can bound the maximum number of
potato777 2014/05/08
tcp

linux
ãƒªãƒ³ã‚¯
TCPé«˜é€ŸåŒ–ãƒ—ãƒã‚ã‚·ã€ŒAccelTCPã€ã‚’å…¬é–‹ã—ã¾ã—ãŸ : DSASé–‹ç™ºè€…ã®éƒ¨å±‹
æ˜¨å¹´æœ«ã‹ã‚‰ãšã£ã¨ã“ã‚“ãªã“ã¨ã‚’ã—ã¦ã¾ã—ã¦ã€ã“ã®æ™‚æœŸã«ãªã£ã¦ã‚ˆã†ã‚„ãä»Šå¹´åˆã®ãƒ–ãƒã‚°è¨˜äº‹ã§ã™ã€‚ é€²æ—çš„ãªã‚¢ãƒ¬ãŒã‚¢ãƒ¬ã§ã”ã‚ã‚“ãªã•ã„ã€‚ãã‚ãã‚3å¹´ç›®ã«çªå…¥ã® @pandax381ã§ã™ã€‚ RTT > 100ms ã¨ã®æˆ¦ã„ çµŒç·¯ã¯ã“ã®ã¸ã‚“ã¨ã‹è¦‹ã¦ã„ãŸã ã‘ã‚‹ã¨ã‚ã‹ã‚Šã¾ã™ãŒã€Œæ—¥æœ¬ã¨æµ·å¤–ã®é–“ã‚’çµã¶é•·è·é›¢ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ï¼ˆã„ã‚ã‚†ã‚‹Long Fat pipe Networkï¼‰ã«ãŠã„ã¦ã€é€šä¿¡æ™‚é–“ã‚’å‰Šæ¸›ã™ã‚‹ã«ã¯ã©ã†ã—ãŸã‚‰ã„ã„ã‹ï¼Ÿã€ã¨ã„ã†ã“ã¨ã‚’ã€æ˜¨å¹´æœ«ãã‚‰ã„ã‹ã‚‰ãšã£ã¨ã‚¢ãƒ¬ã‚³ãƒ¬ã‚„ã£ã¦ã„ã¾ã—ãŸã€‚ é€ä¿¡ã—ãŸãƒ‘ã‚±ãƒƒãƒˆãŒç›¸æ‰‹ã«åˆ°é”ã™ã‚‹ã¾ã§ã®æ™‚é–“ï¼ˆä¼é€é…å»¶ï¼‰ã‚’å‰Šæ¸›ã™ã‚‹ã®ã¯ã€å…‰ãƒ•ã‚¡ã‚¤ãƒãƒ¼ã®åŠ¹çŽ‡ã®ç ”ç©¶ã¨ã‹ã—ãªã„ã¨ç‰©ç†çš„ã«ç„¡ç†ãªã®ã§ã€ã“ã“ã§è¨€ã†é€šä¿¡æ™‚é–“ã¨ã¯ã€ŒTCPé€šä¿¡ã€ã«ãŠã‘ã‚‹ä¸€é€£ã®é€šä¿¡ã‚’å®Œäº†ã™ã‚‹ã¾ã§ã®æ™‚é–“ã§ã™ã€‚ ä¼é€é…å»¶ã«ã¤ã„ã¦ã¯ã€æ—¥æœ¬å›½å†…ã®ãƒ›ã‚¹ãƒˆåŒå£«ã§ã‚ã‚Œã°ã€RTTï¼ˆå¾€å¾©é…å»¶æ™‚é–“ï¼‰ã¯ã ã„ãŸã„10ã€œ30msç¨‹åº¦ã§ã™ãŒã€æ—¥æœ¬ãƒ»åŒ—ç±³é–“ã ã¨10
potato777 2014/05/02
TCP

Network
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Pecinta Drama
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potato777 2014/03/15
http

TCP
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Linuxï¼šOSã®tcpã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã«ã¤ã„ã¦ - HiiHahWIKI - making some notes for... -
Linuxï¼šOSã®tcpã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã«ã¤ã„ã¦ â€ ä¾‹ãˆã°ã€curlã‚’ä½¿ç”¨ã—ã¦ã€ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆå€¤ã‚’300ç§’ã«æŒ‡å®šã—ã€ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã•ã›ã‚‹ã‚ˆã†ç„¡ã„ã“ã¨ã‚’ã—ã¦ã‚‚ã€å®Ÿéš›180ç§’ã‚’è¶…ãˆãŸãã‚‰ã„ã§ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã™ã‚‹äº‹è±¡ãŒç™ºç”Ÿã—ã¦ã„ã¾ã—ãŸã€‚ ã“ã‚ŒãŒã€curlã ã‘ã˜ã‚ƒãªãã¦ã€ä¾‹ãˆã°apacheã®mod_proxy_balancerã®ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰ã‚µãƒ¼ãƒã¸ã®ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã«ã¤ã„ã¦ã‚‚ã€ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆå€¤ã‚’300ç§’ã¨ã‹ã§ã›ã£ã¦ã„ã—ã¦ã‚‚ã€å®Ÿéš›ã¯180ç§’ã¡ã‚‡ã„ã§ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã—ã¦ã—ã¾ã£ã¦ã„ã¾ã—ãŸã€‚ ã“ã‚Œã«ã¤ã„ã¦ã€ã¡ã‚‡ã£ã¨èª¿ã¹ãŸã¨ã“ã‚ã©ã†ã‚‚Linuxã®OSã¨ã—ã¦æŒã£ã¦ã„ã‚‹TCPã®ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆå€¤ãŒåŠ¹ã„ã¦ã„ã‚‹ã‚ˆã†ã ã€ã¨ã„ã†ã“ã¨ãŒã‚ã‹ã‚Šã¾ã—ãŸã€‚ ã“ã“ã‚’è¦‹ã‚‹ã¨åˆ†ã‹ã‚Šã¾ã™ã€‚ #cat /proc/sys/net/ipv4/tcp_syn_retries 5 ã“ã‚Œã¯tcpã®synã‚’é€ä¿¡ã™ã‚‹ãƒªãƒˆãƒ©ã‚¤å›žæ•°ã¿ãŸã„ã§ã€ä»¥ä¸‹ã®ãƒã‚¸ãƒƒã‚¯ã§ãƒªãƒˆ
potato777 2013/12/13
linuxãŒæŒã£ã¦ã„ã‚‹ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã¨ã€apacheãŒæŒã£ã¦ã„ã‚‹ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆã€‚

TCP
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SACSIS.TCP - HPCãƒ¦ãƒ¼ã‚¶ãŒçŸ¥ã£ã¦ãŠããŸã„TCP/IPã®è©±
HPC TCP/IP 2009 5 29 SACSIS2009 HPC TCP/IP 2 â€¢ â€¢ 1 Gbps RTT 100 â€¢ 240 Mbps â˜¹ â€¢ 940 Mbps â˜º (2) HPC TCP/IP â€¢ Ethernet PC â€¢ TCP/IP 2 10MB 3 0 200 400 600 800 1000 0 100 200 300 400 500 600 Bandwidth (Mbps) Time (msec) 160 0 200 400 600 800 1000 0 100 200 300 400 500 600 Bandwidth (Mbps) Time (msec) x3.5 (2) â€¢ TCP/IP â€¢ â€¢ MPI â€¢ TCP/IP TCP â€¢ TCP Reno [RFC2851] â€¢ TCP CUBIC Compound TCP 4 (3) â€¢ TCP/IP â€¢ T
potato777 2013/12/13
TCP

network
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Bandwidth-delay product - Wikipedia
In data communications, the bandwidth-delay product is the product of a data link's capacity (in bits per second) and its round-trip delay time (in seconds).[1] The result, an amount of data measured in bits (or bytes), is equivalent to the maximum amount of data on the network circ uit at any given time, i.e., data that has been transmitted but not yet acknowledged. The bandwidth-delay product was
potato777 2013/12/05
network

tcp
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SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’å¤‰ãˆã¤ã¤ã‚ã‚‹ã€‚HTML5 Conference 2013
SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’å¤‰ãˆã¤ã¤ã‚ã‚‹ã€‚HTML5 Conference 2013 Webã‚’ã‚ˆã‚Šé€Ÿãã—ã‚ˆã†ã¨ã€HTTPã‚ˆã‚Šã‚‚å„ªã‚ŒãŸãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦ææ¡ˆã•ã‚ŒãŸSPDYï¼ˆã‚¹ãƒ”ãƒ¼ãƒ‡ã‚£ï¼‰ã€‚ã—ã‹ã—ãã®SPDYã«ã‚ˆã£ã¦ã€ä¸‹ä½ãƒ¬ã‚¤ãƒ¤ã§ã‚ã‚‹TCPã®åˆ¶é™ãŒé¡•è‘—ã«è¦‹ãˆã‚‹ã‚ˆã†ã«ãªã£ã¦ã—ã¾ã„ã€ãã®ã“ã¨ã§TCPä»¥å¤–ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦QUICã‚’GoogleãŒææ¡ˆã—ã¦ã„ã¾ã™ã€‚ Webã®é€²åŒ–ã¯ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã®ãƒ—ãƒãƒˆã‚³ãƒ«ã«ã¾ã§å½±éŸ¿ã‚’ä¸Žãˆã‚ˆã†ã¨ã—ã¦ã„ã‚‹ã€ã¨ã„ã†éžå¸¸ã«èˆˆå‘³æ·±ã„è©±ãŒã€HTML5ã®ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã€Œhtml5jã€ä¸»å‚¬ã®ã‚¤ãƒ™ãƒ³ãƒˆã€ŒHTML Conference 2013ã€ã§è¡Œã‚ã‚ŒãŸå°æ¾å¥ä½œæ°ã®ã‚»ãƒƒã‚·ãƒ§ãƒ³ã€Œæœ€æ–°Webãƒ—ãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç–ã€ã§è¡Œã‚ã‚Œã¾ã—ãŸã€‚ ãã®å†…å®¹ã‚’ãƒ€ã‚¤ã‚¸ã‚§ã‚¹ãƒˆã§ç´¹ä»‹ã—ã¾ã—ã‚‡ã†ã€‚ æœ€æ–°Webãƒ—ãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç– å°æ¾ã§ã™ã€‚æ‰€å±žã¯NTTã‚³ãƒŸãƒ¥ãƒ‹ã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚ºã§HTML5ã®ç ”ç©¶
potato777 2013/12/04
HTTPSã¨æ¯”è¼ƒãŒã‚ã‹ã‚Šã‚„ã™ã„

SPDY

TCP

HTTPS
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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€…
ã¨ã„ã†ã“ã¨ã«ã€(ä»Šæ›´ï¼Ÿ)æ°—ä»˜ã„ãŸãŠè©±ã§ã™ã€‚ HAã‚’çµ„ã‚“ã éš›ã®VIPã®åˆ‡ã‚Šæ›¿ãˆãƒ†ã‚¹ãƒˆã‚’ã‚„ã£ã¦ã„ã‚‹ã¨ãã«ã€é«˜è² è·æ™‚ã¨ã‹ã¯åˆ‡ã‚Šæ›¿ãˆã«7ç§’ã´ã£ãŸã‚Šã‹ã‹ã‚‹ã‚±ãƒ¼ã‚¹ã¨ã‹ãŒã‚ã£ã¦ã€7ç§’ã£ã¦ä½•ã®æ•°å—ã ã‚ã†ã¨ç–‘å•ã‚’æŒã¡ã¾ã—ãŸã€‚ OSã¯ã€CentOS 6.4(2.6.32-358.23.2.el6.x86_64)ã§ã™ã€‚ TCP SYNã®å†é€é–“éš”ãŒã€1...2...4...ç§’ã«ãªã£ã¦ã„ã‚‹ ã§ã€tcpdumpã‚’çœºã‚ã¦ã„ã‚‹ã¨ä»¥ä¸‹ã®ã‚ˆã†ãªã‚·ãƒ¼ã‚±ãƒ³ã‚¹ã§ã™ã€‚ 11:50:35.689301 IP client-host.8957 > server-host.http: Flags [S], seq 1616681830, win 14600, options [mss 1460,sackOK,TS val 889880946 ecr 0,nop,wscale 7], length 0 11:50:36.688503 IP
potato777 2013/11/29
Linux Kernel 3.2ã§1ç§’ã«å¤‰æ›´ã•ã‚Œã¦ã„ã¦ã€CentOS6.4(or 6.3 ?)ã«ã‚‚ãƒãƒƒã‚¯ãƒãƒ¼ãƒˆã•ã‚Œã¦ã„ã‚‹ã€‚ã¨çŸ¥ã‚‰ãªã‹ã£ãŸã€‚

linux

TCP

network
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Programming UNIX Sockets in C - Frequently Asked Questions
Created by Vic Metcalfe, Andrew Gierth and other contributers (Transrated into Japanese by: Keisuke Mori)May 21, 1998 ã“ã®æ–‡æ›¸ã¯ã€UNIX ä¸Šã§ã® ã‚½ã‚±ãƒƒãƒˆã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã‚’ç”¨ã„ãŸ TCP/IP ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã«ã¤ã„ã¦ã€é »ç¹ã«è¡Œã‚ã‚Œã‚‹è³ªå•ã¨ãã® è§£ç”ã‚’é›†ã‚ãŸã‚‚ã®ã§ã™ã€‚ 1. ä¸€èˆ¬çš„ãªæƒ…å ±ã¨æ¦‚å¿µ 1.1 æ›´æ–°æƒ…å ± 1.2 ã“ã® FAQ ã«ã¤ã„ã¦ 1.3 ã“ã® FAQ ã¯ã©ã®ã‚ˆã†ãªäººå‘ã‘ã§ã—ã‚‡ã†ã‹? 1.4 ã‚½ã‚±ãƒƒãƒˆã£ã¦ä½•ã§ã™ã‹? 1.5 ã‚½ã‚±ãƒƒãƒˆã¯ã©ã®ã‚ˆã†ã«å‹•ä½œã™ã‚‹ã®ã§ã—ã‚‡ã†ã‹? 1.6 [ã‚ã‚‹æœ¬ã®é¡Œå] ã¨ã„ã†æœ¬ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã¯ã©ã“ã‹ã‚‰å–å¾—ã§ãã¾ã™ã‹? 1.7 ã©ã“ã§ã‚‚ã£ã¨æƒ…å ±ã‚’å¾—ã‚‹ã“ã¨ãŒã§ãã¾ã™ã‹? 2. ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã¨ã‚µãƒ¼ãƒ(TCP/SOCK_STREA
potato777 2013/11/10
TCP

socket

network

linux

unix
ãƒªãƒ³ã‚¯
Kazuho@Cybozu Labs: TCPé€šä¿¡ã§ã¯ãƒ‡ãƒ¼ã‚¿ã®é€ä¿¡ã‚’ã¾ã¨ã‚ã¦è¡Œã†ã¹ãã€ã‚‚ã†ã²ã¨ã¤ã®ç†ç”±ï¼ˆï¼† ã‚µãƒ¼ãƒã®ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯æ‰‹æ³•ã®è©±ï¼‰
TCPé€šä¿¡ã‚’ã™ã‚‹ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æ›¸ãéš›ã«ã€Œãƒ‡ãƒ¼ã‚¿ã®é€ä¿¡ã¯ã¾ã¨ã‚ã¦ï¼‘å›žã§ã€è¡Œã†ã¹ãã€ã¨ã„ã†ã®ã¯é‰„å‰‡ã¨è¨€ã£ã¦ã„ã„ã€ã¨æ€ã„ã¾ã™ã€‚ãã®ç†ç”±ã¨ã—ã¦ã¯ã€ãƒ‘ã‚±ãƒƒãƒˆæ•°ã‚’æœ€å°é™ã«æŠ‘ãˆã‚‹ã“ã¨ã§ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ã‚’å°‘ãªãã™ã‚‹ãŸã‚ã ã¨ä¸€èˆ¬ã«èª¬æ˜Žã•ã‚Œã¾ã™ãŒã€è‡ªåˆ†ã¯ã‚‚ã†ã²ã¨ã¤ãƒã‚¤ãƒ³ãƒˆãŒã‚ã‚‹ã¨è€ƒãˆã¦ã„ã¾ã™ã€‚æ¬¡ã®ã‚°ãƒ©ãƒ•ã‚’è¦‹ã¦ãã ã•ã„ã€‚ ã‚°ãƒ©ãƒ•ã¯ã€ä¸€å®šé‡ã®ãƒ‡ãƒ¼ã‚¿ã‚’è»¢é€ã™ã‚‹ã®ã«ã‹ã‹ã‚‹æ™‚é–“ã¨ä½¿ç”¨ã™ã‚‹ãƒ–ãƒãƒƒã‚¯ã‚µã‚¤ã‚ºï¼ˆï¼‘å›žã®write(2)ã§æ›¸ãè¾¼ã‚€ã‚µã‚¤ã‚ºï¼‰ã®é–¢ä¿‚ã‚’è¡¨ã—ãŸã‚‚ã®ã§ã™æ³¨1ã€‚ ãƒ›ã‚¹ãƒˆé–“ã®TCPé€šä¿¡ã‚’è¡Œã£ã¦ã„ã‚‹å ´åˆã¯ã€TCPã®ãƒãƒƒãƒ•ã‚¡ãŒæœ‰åŠ¹ã«æ©Ÿèƒ½ã™ã‚‹ã®ã§ã€ãƒ–ãƒãƒƒã‚¯ã‚µã‚¤ã‚ºï¼ˆï¼ãƒ‘ã‚±ãƒƒãƒˆæ•°ã®é€†æ•°ï¼‰ã«ã‚ˆã‚‹é€Ÿåº¦ã®å¤‰åŒ–ã¯ã€ã»ã¼ã‚ã‚Šã¾ã›ã‚“ã€‚ä¸€æ–¹ã€åŒä¸€ãƒ›ã‚¹ãƒˆä¸Šã§é€šä¿¡ã‚’è¡Œã†ã¨ã€ãƒ–ãƒãƒƒã‚¯ã‚µã‚¤ã‚ºã¨åæ¯”ä¾‹ã—ã¦æ‰€è¦æ™‚é–“ãŒåæ¯”ä¾‹ã®é–¢ä¿‚ã«ã‚ã‚‹ã“ã¨ãŒã‚ã‹ã‚Šã¾ã™ã€‚ åŽŸå› ã¯ã€åŒä¸€ãƒ›ã‚¹ãƒˆä¸Šã®é€šä¿¡ã§ã¯ã€é€ä¿¡ãƒ—ãƒã‚»ã‚¹ãŒwrite(2)ã‚’å‘¼ã¶ãŸã³ã«ã‚³ãƒ³ãƒ†ã‚¯ã‚¹ãƒˆã‚¹ã‚¤ãƒƒãƒãŒç™ºç”Ÿ
potato777 2013/10/21
"åŽŸå› ã¯ã€åŒä¸€ãƒ›ã‚¹ãƒˆä¸Šã®é€šä¿¡ã§ã¯ã€é€ä¿¡ãƒ—ãƒã‚»ã‚¹ãŒwrite(2) ã‚’å‘¼ã¶ãŸã³ã«ã‚³ãƒ³ãƒ†ã‚¯ã‚¹ãƒˆã‚¹ã‚¤ãƒƒãƒãŒç™ºç”Ÿã—ã€å—ä¿¡ãƒ—ãƒã‚»ã‚¹ãŒ èµ·ãä¸ŠãŒã£ã¦read(2)ã§ãƒ‡ãƒ¼ã‚¿ã‚’å—ä¿¡ã™ã‚‹ã¨ã“ã‚ã«ã‚ã‚Šã¾ã™ã€‚"

TCP

linux
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iOS 7ã§MPTCPãŒã‚µãƒãƒ¼ãƒˆã•ã‚ŒãŸè©±
iOS 7ã§MPTCP(Multipath TCP)ãŒã‚µãƒãƒ¼ãƒˆã•ã‚ŒãŸã€‚ ((Apple iOS 7 surprises as first with new multipath TCP connections)) å”çª ((ã—ã‹ã—å®Ÿã¯IETF87ã§ã€anonymous OSãŒå®Ÿè£…ã—ã¦ã„ã‚‹ã¨ã„ã†è©±ã‚‚ã‚ã‚Šã€iOS 7ãŒãã‚Œã ã£ãŸã®ã‹ã¨ç´å¾—ã—ãŸè¨³ã ãŒ))ãªã®ã ãŒåƒ•ã®åšå£«èª²ç¨‹ã«ãŠã‘ã‚‹ç ”ç©¶ãƒ†ãƒ¼ãƒžã§ã‚ã‚Šã€å…ˆã®IETFã§å¤§äººãŸã¡ã«ãƒ¡ãƒƒã‚¿ãƒ¡ã‚¿ã«ã•ã‚ŒãŸã®ã‚‚æ‚”ã—ã„ã®ã§MPTCPã«ã¤ã„ã¦èª¬æ˜Žã—ã¦ã€ä½•ãŒå‡ºæ¥ã‚‹ã‚ˆã†ã«ãªã‚‹ã‹ã‚’æ›¸ããŸã„ã¨æ€ã†ã€‚ MPTCPã¨ã¯ç°¡å˜ã«ã„ã†ã¨TCPã‚¹ãƒˆãƒªãƒ¼ãƒ ã‚’è¤‡æ•°ã®çµŒè·¯ã§è»¢é€ã™ã‚‹ã“ã¨ã«ã‚ˆã‚Šã€ã‚¹ãƒˆãƒªãƒ¼ãƒ ã®å¤šé‡åŒ–ãƒ»è€éšœå®³æ€§ã®å‘ä¸Šã‚’å›³ã‚‹ãƒ—ãƒãƒˆã‚³ãƒ«ã§ã‚ã‚‹ã€‚ ã“ã®ã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§ãªãœã“ã†ã—ãŸãƒ—ãƒãƒˆã‚³ãƒ«ãŒå¿…è¦ã‹ç°¡å˜ã«èª¬æ˜Žã—ãŸã„ã€‚ åƒ•ã‚‰ãŒä½¿ã†ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¯å¤§æŠµTCPã‚’ç”¨ã„ã¦é€šä¿¡ã‚’ã—ã¦ã„ã‚‹ã€‚ãã‚Œã¯é•·ã„ã‚¤ãƒ³ã‚¿
potato777 2013/09/24
Multipath TCP - è¤‡æ•°çµŒè·¯ã‚’ä½¿ã£ã¦ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã¨å†—é•·æ€§ã‚’å¾—ã‚‹ã€‚3G/Wifiã®ãƒãƒ³ãƒ‰ã‚ªãƒ¼ãƒãƒ¼ãŒã‚¹ãƒ ãƒ¼ã‚ºã«ãªã‚‹ã€‚

TCP

network
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WebSocket Nagle ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ å•é¡Œ
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potato777 2013/08/26
iOSã®WebKit + WebScoket ã® Nagleé…å»¶å•é¡Œã¨å›žé¿ç–

iOS

TCP

websocket
ãƒªãƒ³ã‚¯
Nagleã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ - Wikipedia
Nagleã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ï¼ˆãƒãƒ¼ã‚°ãƒ«ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã€Nagleâ€™s algorithmï¼‰ã¯ã€TCP/IP ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã§é€ä¿¡ã—ãªã‘ã‚Œã°ãªã‚‰ãªã„ãƒ‘ã‚±ãƒƒãƒˆæ•°ã‚’æ¸›ã‚‰ã—ã€åŠ¹çŽ‡æ€§ã‚’ã‚ã’ã‚‹ãŸã‚ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã§ã‚ã‚‹ã€‚ã‚¸ãƒ§ãƒ³ãƒ»ãƒãƒ¼ã‚°ãƒ« (John Nagle) ã‹ã‚‰åã¥ã‘ã‚‰ã‚ŒãŸã€‚ NagleãŒ1984å¹´ã«æ›¸ã„ãŸRFCæ–‡ç« ã€Congestion Control in IP/TCP Internetworks (RFCÂ 896) ã§ã¯ã€å½¼ãŒã€Œå°ã•ãªãƒ‘ã‚±ãƒƒãƒˆå•é¡Œã€ã¨å‘¼ã¶ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒç¹°ã‚Šè¿”ã—1ãƒã‚¤ãƒˆãªã©å°ã•ãªç²’åº¦ã§é€ä¿¡ã™ã‚‹å•é¡Œã‚’å–ã‚Šä¸Šã’ã¦ã„ã‚‹ã€‚IPv4 ã§ 20ãƒã‚¤ãƒˆã€TCPè‡ªä½“ã§20ãƒã‚¤ãƒˆã®ãƒ˜ãƒƒãƒ€ãƒ¼ãŒã‚ã‚Šã€åˆè¨ˆ40ãƒã‚¤ãƒˆã«ãªã‚‹ãŸã‚ã€1ãƒã‚¤ãƒˆã‚’é€ä¿¡ã™ã‚‹ã®ã«åˆè¨ˆ41ãƒã‚¤ãƒˆé€ä¿¡ã—ãªãã¦ã¯ãªã‚‰ãªãã€ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ãŒå¤§ãã„ã€‚ã“ã‚Œã¯ã€Telnet ã‚»ãƒƒã‚·ãƒ§ãƒ³ãªã©ã§ã‚ˆãç™ºç”Ÿã—ã€ã‚ãƒ¼æ“ä½œãŒ1ãƒã‚¤ãƒˆã®ãƒ‡ãƒ¼ã‚¿ã‚’ç”Ÿæˆã—ã€å³æ™‚ã«é€ä¿¡
potato777 2013/08/26
TCP/IP ã§æœ€å¤§ã‚»ã‚°ãƒ¡ãƒ³ãƒˆã‚µã‚¤ã‚ºä»¥ä¸‹ã®è¤‡æ•°ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’ä¸€ã¤ã«æŸãã€ã¾ã¨ã‚ã¦é€ä¿¡ã™ã‚‹ã€‚åŠ¹çŽ‡æ€§ã‚’ã‚ã’ã‚‹ãŸã‚ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã€‚ãƒªã‚¢ãƒ«ã‚¿ã‚¤ãƒ ã‚’æœŸå¾…ã™ã‚‹ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã§ã¯æ‚ªãåƒãã€‚TCP_NODELAY ã‚’ä½¿ã„ã€Nagleé…å»¶ã‚’å›žé¿

TCP
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Velocity 2013 TCP Tuning for the Web
A particle filter based scheme for indoor tracking on an Android Smartphone
potato777 2013/08/14
TCP

network
ãƒªãƒ³ã‚¯
http://eng.42go.com/websockets-vs-regular-sockets/
potato777 2013/08/06
Play/Netty + WebSocket vs TCP Socket

TCP

websocket

Network

Netty
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