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mTCP使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
WebSocket(RFC 6455)上ã§ä½¿ç”¨ã™ã‚‹ãƒ—ãƒãƒˆã‚³ãƒ«è¨è¨ˆã«ã¤ã„ã¦ã®å‚™å¿˜éŒ² - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
一般論ã¨ã—ã¦ã€å…¨äºŒé‡ã®é€šä¿¡ãƒ—ãƒãƒˆã‚³ãƒ«ã‚’実装ã™ã‚‹ã«ã‚ãŸã£ã¦ã¯ã€ã„ãã¤ã‹æ³¨æ„ã™ã¹ã点ãŒã‚ã£ã¦ã€å…·ä½“çš„ã«ã¯ã€åˆ°é”確èªã¨åˆ‡æ–シーケンスã«ã¤ã„ã¦å®šã‚ã¦ãŠã‹ãªã„ã¨ã€é€é”ã•ã‚ŒãŸã¯ãšã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ãŒãƒã‚¹ãƒˆã—ã¦ã„ãŸã‚Šã€åˆ‡æ–タイミングã«ã‚ˆã£ã¦ã‚¨ãƒ©ãƒ¼ãŒç™ºç”Ÿ*1ã—ãŸã‚Šã™ã‚‹ã€‚ 具体例をã‚ã’ã‚‹ã¨ã€ãŸã¨ãˆã°TCP/IPã«ãŠã„ã¦shutdown(2)を用ã„ãšã«ã€ã„ããªã‚Šclose(2)を呼んã§ã„ã‚‹ã¨ã€read(2)ã‚„write(2)ãŒã‚¨ãƒ©ãƒ¼(ECONNRESET)ã‚’è¿”ã™å ´åˆãŒã‚る。 ç¿»ã£ã¦ã€WebSocket (RFC6455)ã®å ´åˆã¯ã©ã†ãªã£ã¦ã‚‹ã‹ï¼Ÿã€€ã ã„ãŸã„以下ã®ã‚ˆã†ãªæ„Ÿã˜ã£ã½ã„。 ws.close()ãŒå‘¼ã³å‡ºã•ã‚Œã‚‹ã¨WebSocketã‚’CLOSING状態ã«å¤‰æ›´ã—ã€Closeフレームをé€ä¿¡ã™ã‚‹ ws.onmessageã¯WebCosketãŒCLOSING状態ã«ã‚る間も呼ã°ã‚Œã‚‹ã‹ã‚‚ã—ã‚Œãªã„*2 相手ã‹ã‚‰Closeフレーãƒ
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※ 以下ã€ãƒ•ã‚£ã‚¯ã‚·ãƒ§ãƒ³ã§ã™ã€‚ ã¯ã˜ã‚ã«ï¼š ã“ã‚“ãªã‚µãƒ¼ãƒ(↓dstat) (è£ãƒãƒƒãƒã«ã‚ˆã‚Šiowaitã¨LAãŒé«˜ã„ã®ã¯ä¸€æ™‚çš„ãªä»•æ§˜ã¨ã™ã‚‹) 気付ã‘ã°ãƒã‚°ã«ãƒ»ãƒ»ãƒ» Mar 29 18:08:02 hostname kernel: printk: 48843 messages suppressed. Mar 29 18:08:02 hostname kernel: TCP: time wait bucket table overflow Mar 29 18:08:07 hostname kernel: printk: 54962 messages suppressed. Mar 29 18:08:07 hostname kernel: TCP: time wait bucket table overflow Mar 29 18:08:12 hostname kernel: printk: 648
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