The mystery of the hanging S3 downloads
A coworker was experiencing a strange problem with their Internet connection at home. Large downloads from most sites worked fine. The exception was that downloads from a Amazon S3 would get up to a good speed (500Mbps), stall completely for a few seconds, restart for a while, stall again, and eventually hang completely. The problem seemed to be specific to S3, downloads from generic AWS VMs were
WEBサーãƒã®TCPコãƒã‚¯ã‚·ãƒ§ãƒ³æ•°ã«ä¸Šé™ã¯ã‚ã‚‹ã®ã‹ï¼Ÿ - Qiita
ã¯ã˜ã‚㫠アクセス数ãŒã™ã”ã„環境ã¯å¤§æŠµé«˜è² è·ç’°å¢ƒã§ã‚‚ã‚ã‚‹ã®ã§å¯¾ç–ã¨ã—ã¦Apacheã®è¨å®šã‚„サーãƒæ§‹æˆã®ã‚»ã‚ªãƒªãƒ¼ã‚’ã™ã見ã¤ã‘られã¦å®Ÿéš›è©¦ã—ã¦ã‚‚ç›®ã«è¦‹ãˆã¦è‰¯ããªã‚Šã¾ã™ã€‚ アクセス数ã®å¤šã•ã§èµ·ã“ã‚‹å•é¡Œã¯å®Ÿéš›ã«è² è·ã‚’ã‹ã‘ã¦ã¿ãªã„ã¨è¡¨é¢åŒ–ã—ã¾ã›ã‚“。 å•é¡ŒãŒåˆ†ã‹ã£ãŸã‚‰è¨å®šã‚„パラメータを調整ã—ã¦ç¾çŠ¶ãŒã¾ã—ã«ãªã‚‹ã‚ˆã†ã«ã™ã‚‹ã ã‘ã§ã™ã€‚ ã§ã™ãŒé™ã‚Šã‚るリソースã®ä¸ã§TCPセッションをå分ã«ã‚³ãƒ³ãƒˆãƒãƒ¼ãƒ«ã—よã†ã¨ã™ã‚‹ã¨ã™ã手詰ã¾ã‚Šã§ã™ã€‚ WEBサーãƒãŒã—ã¦ã„ã‚‹ã‚„ã‚Šã¨ã‚Šã®åŸºç¤ŽãŒè¶³ã‚Šã¦ã„ãªã„ãã‚“ãªæ°—ãŒã—ã¦ã„ãŸã®ã§TCPã«ç›®ã‚’å‘ã‘ã¦ã¿ã¾ã—ãŸã€‚ è¡Œãç€ã„ãŸçµæžœã¯ å¾…ã¡å—ã‘å´ã¨ãƒªã‚¯ã‚¨ã‚¹ãƒˆå´ã§ã¯ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ãŒé•ã† リクエスト時ã¯TCPã®ã‚¨ãƒ•ã‚§ãƒ¡ãƒ©ãƒ«ãƒãƒ¼ãƒˆãŒä¸Šé™ å¾…ã¡å—ã‘時ã¯TCPよりもファイルディスクリプタãŒä¸Šé™ ã«ãªã‚Šã‚„ã™ã„ ã¨ã„ã†è‰¯ã見ã‹ã‘ã‚‹è¨å®šã‚’見直ã™ã¨ã„ã†ã“ã¨ã«ãªã‚Šã¾ã—ãŸãŒã€ã©ã†ã‚„ã£ã¦ãã†ãªã£ã¦ã„ã‚‹ã®ã‹ãŒä»Šå›žã®æˆæžœã
Cloudflare architecture and how BPF eats the world
Cloudflare architecture and how BPF eats the world2019-05-18 Recently at Netdev 0x13, the Conference on Linux Networking in Prague, I gave a short talk titled "Linux at Cloudflare". The talk ended up being mostly about BPF. It seems, no matter the question - BPF is the answer. Here is a transcript of a slightly adjusted version of that talk. At Cloudflare we run Linux on our servers. We operate tw
gopacketã§pcapã‚’èªã¿è¾¼ã‚€ - mrtc0.log
Goã§ãƒ‘ケットを扱ã†ãƒ©ã‚¤ãƒ–ラリã«gopacketãŒã‚る。 github.com ã“ã“ã§ã¯gopacketã§pcapã‚’èªã¿è¾¼ã‚“ã§ãƒ‘ケットã®å†…容を表示ã—ã¦ã¿ã‚‹ã€‚ å˜ç´”ã«èªã¿è¾¼ã‚“ã§è¡¨ç¤ºã™ã‚‹ èªã¿è¾¼ã‚€pcapã¯http.capを使ã£ã¦ã„る。 package main import ( "fmt" "io" "github.com/google/gopacket" "github.com/google/gopacket/pcap" "log" ) var ( pcapFile string = "http.cap" handle *pcap.Handle err error ) func main() { handle, err = pcap.OpenOffline(pcapFile) if err != nil { log.Fatal(err) } defer handle.Close() pac
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24. 24 # iptables -A OUTPUT -p tcp -d xxx.xxx.xxx.xxx --dport 3306 -j REJECT
nginxã®TCPãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã‚’試㙠- CLOVERðŸ€
先日ã€nginxã®HTTPã§ã®ãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã‚’試ã—ã¾ã—ãŸã€‚ nginxã®HTTPãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã‚’試㙠- CLOVER 次ã¯ã€ã‚‚ã£ã¨æ±Žç”¨çš„ã«TCPã§ã®ãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã‚’ã—ã¦ã¿ãŸã„ã¨æ€ã„ã¾ã™ã€‚ãªãŠã€ä»Šå›žã¯TCPã®ã¿ã§æ‰±ã„ã¾ã™ãŒã€UDPã§ã®ãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã‚‚å¯èƒ½ãªã‚ˆã†ã§ã™ã€‚ ドã‚ュメント 主è¦ã«åˆ©ç”¨ã™ã‚‹ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«çš„ã«ã¯ã€ Module ngx_stream_core_module 㨠Module ngx_stream_upstream_module ã®2ã¤ã¨ãªã‚Šã¾ã™ã€‚ ã¾ãŸã€ã“ã¡ã‚‰ã®ãƒ‰ã‚ュメントもå‚考ã«ã—ã¾ã—ãŸã€‚ NGINX Docs | NGINX Load Balancing – TCP and UDP Load Balancer MySQLã¸ã®æŽ¥ç¶šã‚’ãƒãƒ¼ãƒ‰ãƒãƒ©ãƒ³ã‚·ãƒ³ã‚°ã—ã¦ã¿ã‚ˆã† 今回ã®TCP接続ã®å¯¾è±¡ã¨ã—ã¦ã€MySQLサーãƒãƒ¼ã‚’æŒã¡å‡ºã—ã¦ã¿ã¾ã™ã€‚ MySQLサーãƒãƒ¼ãŒã€æ¬¡ã®
Skeed社ã®SSBPã®è¡¨é¢çš„ã¾ã¨ã‚ - ..ãŸã‚Œã‚ã..
Interop2012 ã®ç¾åœ°ã§ SSBP (Skeed Silver Bullet Protocol) ã®ã“ã¨ã‚’èžã„ã¦ããŸã®ã§ã¾ã¨ã‚。 SSBP ã®ã‚¿ãƒ¼ã‚²ãƒƒãƒˆãƒ»ç‰¹å¾´ SSBP 㯠LFP (Long Fat Pipe; 物ç†å¸¯åŸŸã¯å¤ªã„ãŒRTTãŒå¤§ãã„経路)ã§å¤§å®¹é‡ã®ãƒ•ã‚¡ã‚¤ãƒ«è»¢é€ã‚’çŸæ™‚é–“ã«çµ‚ãˆã‚‹ãƒ—ãƒãƒˆã‚³ãƒ«ã€‚ テープé€ã‚Œã°ã„ã„ã˜ã‚ƒã‚“→物ç†åª’体é€ã‚‹ã®ã¯ç¨Žé–¢ã¨ã‹ç´›å¤±ã¨ã‹ãŒæ€–ã„よãã£ã¦å ´åˆã«ã€‚ RTT ãŒå¤§ãã„経路やパケットè½ã¡ãŒèµ·ãる経路ã§ã‚‚ TCP より性能ãŒè½ã¡ã«ãã„。 æ—¢å˜ãƒˆãƒ©ãƒ’ックã¨ã®å…¬å¹³æ€§ã«ã¤ã„ã¦ã‚‚考慮ã—ã¦ã‚‹ã€‚ デモã§ã®æ€§èƒ½ ç¾åœ°ãƒ‡ãƒ¢ã€‚対ヨーãƒãƒƒãƒ‘(アイスランド。ã ã£ã‘？) 1GBã®ãƒ•ã‚¡ã‚¤ãƒ«10æœ¬è»¢é€ FTP 比㧠1/10 程度ã®æ™‚é–“ã§ãƒ•ã‚¡ã‚¤ãƒ«è»¢é€ã‚’終ãˆã¦ã„ãŸã€‚ ã—ãã¿ UDP ã®ä¸Šã«å†é€åˆ¶å¾¡ãƒ»ãƒ¬ãƒ¼ãƒˆåˆ¶å¾¡ãƒ»ã‚»ã‚ュリティ機能(DH+AESらã—ã„)を載ã£ã‘ãŸã‚‚ã®ã€‚ TCP ã 㨠ACK
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GitHub - mehrdadrad/tcpprobe: Modern TCP tool and service for network performance observability.
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