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2017å¹´10月27æ—¥ã€ãƒ¢ãƒŽãƒ“ットエンジン勉強会inサイãƒãƒ¼ã‚³ãƒã‚¯ãƒˆãƒ„ーã«ã¦ã€ä¸å¶‹è¬™äº’ãŒè¬›æ¼”ã—ã¾ã—ãŸã€Œãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚²ãƒ¼ãƒ ã«ãŠã‘ã‚‹ TCPã¨UDPã®ä½¿ã„分ã‘ã€ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã«ãªã‚Šã¾ã™ã€‚ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚²ãƒ¼ãƒ を製作ã™ã‚‹éš›ã«ã”å‚è€ƒé ‚ã‘ã¾ã™ã¨å¹¸ã„ã§ã™ã€‚ 登壇者： æ ªå¼ä¼šç¤¾ãƒ¢ãƒŽãƒ“ット å–ç· å½¹ CTO ä¸å¶‹è¬™äº’Read less
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ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ãƒˆãƒ©ãƒ–ルシュートãªã©ã‚’ã™ã‚‹æ™‚ã«tcpdumpã‚„wiresharkã¨ã„ã£ãŸãƒ„ールを使ã£ã¦ã‚ャプãƒãƒ£ãƒ‡ãƒ¼ã‚¿ã‚’å–å¾—ã—ã€æ£å¸¸ã§ã¯ãªã„通信を特定ã™ã‚‹ãªã©åˆ†æžã—ã¾ã™ã€‚ãã®æ™‚ã«IPアドレスやãƒãƒ¼ãƒˆç•ªå·ã¨ã„ã£ãŸã“ã¨ã¯å½“然確èªã™ã‚‹ã¨æ€ã„ã¾ã™ãŒã€æœ¬è¨˜äº‹ã§ã¯ãれ以外ã«åˆ†æžã«åˆ©ç”¨ã§ããã†ãªå°æŠ€ã‚’ã„ãã¤ã‹ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ãŠé¡Œã¯ä»¥ä¸‹ã®ã¨ãŠã‚Šã§ã™ã€‚ MACアドレスã‹ã‚‰NICã®ãƒ™ãƒ³ãƒ€ãƒ¼ãŒåˆ†ã‹ã‚‹ IPヘッダã‹ã‚‰ãŠãŠã‚ˆãã®ãƒ›ãƒƒãƒ—æ•°ãŒæŽ¨æ¸¬ã§ãã‚‹ TCP/IPヘッダã‹ã‚‰OSを推定ã§ãã‚‹ TCPã®3-way-handshakeã‹ã‚‰ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®é…延を測れる TCPã®å†é€çŠ¶æ³ã‹ã‚‰ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å“質ã®å¤‰åŒ–を見れる DHCP/mDNS/NBNS/LLMNR ã‹ã‚‰åŒä¸€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å†…ã®ãƒ›ã‚¹ãƒˆåãŒã‚ã‹ã‚‹ TLSã®client helloã‹ã‚‰æŽ¥ç¶šå…ˆã®ãƒ›ã‚¹ãƒˆåãŒã‚ã‹ã‚‹ ã€æ³¨æ„äº‹é …ã€‘ 本è·ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®æ–¹ã«ã¨ã£ã¦ã¯å½“ãŸ
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hb.matsumoto-r.jp 以下ã®ã‚¨ãƒ³ãƒˆãƒªã¯ä¸€éƒ¨èª¤èªãŒå«ã¾ã‚Œã¦ã„ãŸã®ã§ã€ä¸Šè¨˜ã‚¨ãƒ³ãƒˆãƒªã«ãã®æ—¨ã‚’ã¾ã¨ã‚ã¾ã—ãŸã®ã§å¾¡è¦§ãã ã•ã„。 ã¨ã‚る事情ã§ãƒŸãƒ‰ãƒ«ã‚¦ã‚§ã‚¢ä¸Šã‹ã‚‰é«˜é€Ÿã«ãƒªãƒ¢ãƒ¼ãƒˆãƒ›ã‚¹ãƒˆã®ãƒãƒ¼ãƒˆã®Listenãƒã‚§ãƒƒã‚¯ã‚’ã—ãŸããªã‚Šã¾ã—ãŸã€‚ãƒãƒ¼ã‚«ãƒ«ãƒ›ã‚¹ãƒˆã®ãƒãƒ¼ãƒˆã§ã‚ã‚Œã°ã€/procã‚„netlinkãªã©ã‚’使ã£ã¦ç´ æ—©ããƒã‚§ãƒƒã‚¯ã™ã‚‹æ–¹æ³•ãŒã‚ã‚Šã¾ã™ãŒã€ä»Šå›žã¯å¯¾è±¡ãŒãƒªãƒ¢ãƒ¼ãƒˆãƒ›ã‚¹ãƒˆãªã®ã§ã‚½ã‚±ãƒƒãƒˆã§ãªã‚“ã¨ã‹ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ ãã“ã§ã€èª°ã‚‚ãŒã¾ãšæ€ã„ã¤ãã®ã¯ã€connect()システムコールã«ã‚ˆã£ã¦ãƒªãƒ¢ãƒ¼ãƒˆãƒ›ã‚¹ãƒˆã®ãƒãƒ¼ãƒˆã«æŽ¥ç¶šã—ã«ã„ã£ã¦ã€connectã§ãã‚Œã°OKã€ã§ããªã‘ã‚Œã°NGã¨åˆ¤å®šã™ã‚‹æ–¹æ³•ãŒã‚ã‚Šå¾—ã‚‹ã§ã—ょã†ã€‚ï¼ˆé«˜è² è·æ™‚ã«æŽ¥ç¶šã§ããªã„パターンã¯Listenã—ã¦ã„ãªã„ã¨åˆ¤å®šã—ã¦ã‚ˆã„） ãã“ã§ä¸€æ—¦ã€æœ€ä½Žé™socket()システムコールã¨connect()システムコールã§æŽ¥ç¶šã™ã‚‹æ™‚ã®ãƒ‘ケットをtcpdumpã§çœº
Why do we use the Linux kernel's TCP stack?
June 30, 2016 I’m at PolyConf in Poland today, and I watched this super interesting talk by Leandro Pereira about Lwan, an ~8000 line of code web server. He talked about a bunch of the optimizations they’d done (improve CPU cache performance! be really careful about locking!). You can read more about the performance on the website & the links there. It’s a super cool project because it started out
GCPã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã§ãƒãƒžã£ãŸè©±
第16回elasticsearch勉強会 https://elasticsearch.doorkeeper.jp/events/46539
Userspace networking
Seven years ago at LCA, Van Jacobsen introduced the concept of net channels but since then the concept of user mode networking has not hit the mainstream. There are several different user mode networking environments: Intel DPDK, BSD netmap, and Solarflare OpenOnload. Each of these provides higher performance than standard Linux kernel networking; but also creates new problems. This talk will expl
Why protocol stacks should be in user-space?
Why protocol stacks should be in user-space? Michio Honda (NEC Europe), JoaoTaveira Araujo (UCL), Luigi Rizzo (Universitea de Pisa), Costin Raiciu (Universitea Buchalest) Felipe Huici (NEC Europe) IETF87 MPTCP WG July 30, 2013 Berlin Motivation • Extending layer 4 functionality addresses a lot of problems – Increased performance • MPTCP, WindowScale, FastOpen,TLP, PRR – Ubiquitous encryption • Tcp
Multipath TCP: an overview [LWN.net]
The world was a simpler place when the TCP/IP network protocol suite was first designed. The net was slow and primitive and it was often a triumph to get a connection to a far-away host at all. The machines at either end of a TCP session normally did not have to concern themselves with how that connection was made; such details were left to routers. As a result, TCP is built around the notion of a
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"速ã•" ã®æ„味ã¯ï¼Ÿ é…延時間を測る データ帯域を測る 試験用ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚’作る 例: wget ã§é€Ÿåº¦ã‚’測定 速度低下や変動ã®åŽŸå› 回線を高速化ã™ã¹ãã‹ï¼Ÿã©ã“ã¾ã§ï¼Ÿ "速ã•" ã®æ„味ã¯ï¼Ÿ TCP/IP ã«ä½¿ã£ã¦ã„る回線ã®ã‚¹ãƒ”ードã¨äº‘ã£ã¦ã‚‚大ã¾ã‹ã«ã¯ "ãƒãƒ³ãƒ‰å¹…" 㨠"レイテンシー" ã®2ã¤ãŒã‚ã‚‹. データ帯域: 一定時間ã‚ãŸã‚Šã«é€šä¿¡ã§ãるデータé‡. 個人ã®åˆ©ç”¨ã§ã¯ã“ã‚ŒãŒå®Ÿéš›ã®ä½¿ç”¨æ„Ÿã¨ä¿‚ã‚ã£ã¦ã„ã‚‹ã¨æ€ã†. 以下ã®ãƒãƒ³ãƒ‰å¹…, レイテンシーã®ä»–㫠パケットサイズ, å—信窓サイズ,エラーã«ä¾ã‚‹å†è»¢é€ãªã©ã®æ§˜ã€…ãªè¦å› ã«å½±éŸ¿ã•ã‚Œã‚‹. ãƒãƒ³ãƒ‰å¹…(band width): 一定時間ã«é€šéŽã§ãるデータé‡. データ経路ã®å¤ªã•ã¨è€ƒãˆã‚‹ã¨è‰¯ã„. 究極的ã«ã¯æµã›ã‚‹ä¿¡å·ã®å‘¨æ³¢æ•°(帯域幅)ã«ã‚ˆã‚‹. 経路ãŒè¤‡æ•°ã®è¦ç´ ã‹ã‚‰ãªã‚‹ã¨ã, 最å°ã®ãƒãƒ³ãƒ‰å¹…ã®è¦ç´ ãŒåˆ¶é™ã®è¦å› ã¨ãªã‚‹. 例： ã»ã¼, 10BASE, 100BASE
Ethernetã®å—信処ç†
2. rcu read lock receive_queue lock nf_hooks nf_iterate rcu read lock tcp_rcv_established tcp_v4_do_rcv nf_hook_slow nf_hook_thresh ___napi_schedule __napi_schedule e1000_intr handle_irq do_IRQ common_interrupt interrupt get_rps_cpu sock_queue_rcv_skb ip_queue_rcv_skb __udp_queue_rcv_skb udp_queue_rcv_skb __udp4_lib_rcv ip_local_deliver_finish NF_HOOK ip_defrag ip_rcv_finish NF_HOOK ip_rcv __netif
TCP incast: What is it? How can it affect Erlang applications? | Humans and Hippos in Harmony
So, what’s the deal with the “TCP incast†pattern?  Never heard of it?  Join the club. I’ve been wearing a developer hat for too long and not wearing my sysadmin and network manager hats.  And the publications about Ethernet microbursts and the TCP incast pattern have been hiding in conference proceedings & journals that I don’t follow.  (Note to self: change reading habits.) If you’d rather read
ãƒãƒƒã‚¯ãƒã‚°ã®æŒ‡å®š - æ®ç™ºæ€§ã®ãƒ¡ãƒ¢ï¼’
listenã®ãƒãƒƒã‚¯ãƒã‚°ãŒæŒ‡å®šã§ããªã„ - æ®ç™ºæ€§ã®ãƒ¡ãƒ¢ã®ç¶šã http://www.linux.or.jp/JM/html/LDP_man-pages/man2/listen.2.html int listen(int sockfd, int backlog); backlogã§ãƒãƒƒã‚¯ãƒã‚°ã®æ•°ï¼accept()å¾…ã¡ã®æŽ¥ç¶šã®ã‚ューã®æ•°ã‚’指定ã§ãる。 ã¨ã„ã†ã“ã¨ã«ãªã£ã¦ã„ã‚‹ã‘ã©ã€å®Ÿéš›ã¯ã‚ューã®æ•°ã‚’ã‚ã¾ã‚Šåˆ¶é™ã§ããªã„ã£ã½ã„。 カーãƒãƒ«å´ã®è¨å®šã‚’ # cat /proc/sys/net/ipv4/tcp_syncookies 0 # cat /proc/sys/net/ipv4/tcp_max_syn_backlog 1プãƒã‚°ãƒ©ãƒ å´ã‚’ result = listen( sd, 1 );ã¨ã—ã¦åˆ¶é™ã‹ã‘ã¦ã„ã¦ã‚‚ã€å®Ÿéš›ã«ã¯ã‚»ãƒƒã‚·ãƒ§ãƒ³ãŒç¢ºç«‹ã—ã¦ã—ã¾ã†ã€‚ tcp 0 0 172.16.1.4:5000 1
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p0f v3
What's this? P0f is a tool that utilizes an array of sophisticated, purely passive traffic fingerprinting mechanisms to identify the players behind any incidental TCP/IP communications (often as little as a single normal SYN) without interfering in any way. Version 3 is a complete rewrite of the original codebase, incorporating a significant number of improvements to network-level fingerprinting,
TCP Fast Open – Webを速ãã™ã‚‹ãŸã‚ã«GoogleãŒã‚„ã£ã¦ã„ã‚‹ã“㨠Make the Web Faster 4 –
TCP Fast Open – Webを速ãã™ã‚‹ãŸã‚ã«GoogleãŒã‚„ã£ã¦ã„ã‚‹ã“㨠Make the Web Faster 4 – Jxck HTTPã¯ã€ãã®ä¸‹å±¤ã«ã‚ãŸã‚‹ãƒˆãƒ©ãƒ³ã‚¹ãƒãƒ¼ãƒˆãƒ¬ã‚¤ãƒ¤ãƒ¼ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦ã€é€šå¸¸TCPを使用ã—ã¾ã™ã€‚ ã—ãŸãŒã£ã¦ã€TCPã®ãƒ¬ã‚¤ãƒ¤ã§é€Ÿåº¦ãŒæ”¹å–„ã™ã‚‹ã“ã¨ã¯ã€ãã®ã¾ã¾Webã®é«˜é€ŸåŒ–ã«ã¤ãªãŒã‚‹å¯èƒ½æ€§ãŒã‚ã‚‹ã¨ã„ãˆã¾ã™ã€‚ Googleã¯Webを速ãã™ã‚‹ãŸã‚ã®æ´»å‹•ã¨ã—ã¦ã€TCPã®ã‚ˆã†ãªãƒ—ãƒãƒˆã‚³ãƒ«ãƒ¬ã‚¤ãƒ¤ã®æ”¹å–„ã«ã‚‚å–り組んã§ã„ã¾ã™ã€‚ 今回ã¯ãã®ä¸ã®ä¸€ã¤ã€TCP Fast Openã‚’å–り上ã’ã€è§£èª¬ã¨å‹•ä½œæ¤œè¨¼ã€ç°¡å˜ãªãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã‚’è¡Œã„ã¾ã™ã€‚ 検証環境ç‰ã¯æœ€ä¸‹éƒ¨ã«è¨˜è¼‰ã—ã¾ã™. Make the Web Faster: TCP Fast Open 3 Way Handshake TCPã¯ã€ã€Œæ£ç¢ºã€ç¢ºå®Ÿã«ãƒ‡ãƒ¼ã‚¿ã‚’届ã‘ã‚‹ã€ã“ã¨ã‚’é‡è¦–ã—ãŸè¨è¨ˆã«ãªã£ã¦ã„ã¾ã™ã€‚ 特ã«æŽ¥ç¶šç¢ºç«‹æ™‚ã«ã¯ã€åŒæ–¹ã®çŠ¶
SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’変ãˆã¤ã¤ã‚る。HTML5 Conference 2013
SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’変ãˆã¤ã¤ã‚る。HTML5 Conference 2013 Webをより速ãã—よã†ã¨ã€HTTPよりも優れãŸãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦æ案ã•ã‚ŒãŸSPDY（スピーディ）。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§TCP以外ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦QUICã‚’GoogleãŒæ案ã—ã¦ã„ã¾ã™ã€‚ Webã®é€²åŒ–ã¯ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã®ãƒ—ãƒãƒˆã‚³ãƒ«ã«ã¾ã§å½±éŸ¿ã‚’与ãˆã‚ˆã†ã¨ã—ã¦ã„ã‚‹ã€ã¨ã„ã†éžå¸¸ã«èˆˆå‘³æ·±ã„話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–°Webプãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç–ã€ã§è¡Œã‚ã‚Œã¾ã—ãŸã€‚ ãã®å†…容をダイジェストã§ç´¹ä»‹ã—ã¾ã—ょã†ã€‚ 最新Webプãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç– å°æ¾ã§ã™ã€‚所属ã¯NTTコミュニケーションズã§HTML5ã®ç ”究
Linuxã®TCP SYNã®å†é€é–“éš”ã®åˆæœŸå€¤ãŒ3秒ã‹ã‚‰1秒ã«å¤‰æ›´ã•ã‚Œã¦ã„㟠- å…ƒRX-7ä¹—ã‚Šã®é©å½“ãªæ—¥ã€…
ã¨ã„ã†ã“ã¨ã«ã€(今更？)気付ã„ãŸãŠè©±ã§ã™ã€‚ HAを組ん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«7秒ã´ã£ãŸã‚Šã‹ã‹ã‚‹ã‚±ãƒ¼ã‚¹ã¨ã‹ãŒã‚ã£ã¦ã€7秒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...秒ã«ãªã£ã¦ã„ã‚‹ ã§ã€tcpdumpを眺ã‚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
An Empirical Evaluation of TCP Performance in Online Games titlenote{ small This work is supported in part by the National Science Council of the Republic of China under the Grants No. NSC 94-2213-E-002-043 and NSC 94-2218-E-002-038, and by the Ministry o
Abstract A fundamental design question to ask in the development of a network game is-Which transport protocol should be used-TCP, UDP, or some other protocols? Seeking an objective answer to the choice of communication protocol for MMORPGs, we assess whether TCP, a popular choice, is suitable for MMORPGs based on empirical evidence. To the best of our knowledge, this work is the first evaluation
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TCP Anycast - Don’t believe the FUD
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