Serving 100 Gbps from an Open Connect Appliance
In the summer of 2015, the Netflix Open Connect CDN team decided to take on an ambitious project. The goal was to leverage the new 100GbE network interface technology just coming to market in order to be able to serve at 100 Gbps from a single FreeBSD-based Open Connect Appliance (OCA) using NVM Express (NVMe)-based storage. At the time, the bulk of our flash storage-based appliances were close to
Linux Performance
static, benchmarking, tuning: sar, perf-tools, bcc/BPF: bpftrace, BPF book: Images license: creative commons Attribution-ShareAlike 4.0. This page links to various Linux performance material I've created, including the tools maps on the right. These use a large font size to suit slide decks. You can also print them out for your office wall. They show: Linux observability tools, Linux static perfor
Linuxカーãƒãƒ«ãƒãƒƒã‚¯ã«èˆˆå‘³ãŒã‚ã‚‹ã‘ã©ç‰¹ã«ãƒã‚¿ãŒç„¡ã„ã‚“ã よãªã€œã£ã¦äººå‘ã‘ã®å°ãƒã‚¿ - φ(・・*)ã‚ž ｳｰï¾ã€€ã‚«ãƒ¼ãƒãƒ«ã¨ã‹å¼„ã£ãŸã‚Šã®ãƒ¡ãƒ¢
Linuxカーãƒãƒ«ã«èˆˆå‘³ãŒã‚ã‚‹ã‚“ã ã‘ã©ç‰¹ã«ä½œã‚ŠãŸã„ã‚‚ã®ã£ã¦ãªã„ã‚“ã よãªãƒ¼ãªã‚“ã¦å‰²ã¨ã‚ã‚‹ã¨æ€ã†è¨³ã§ã™ã€‚俺ã¨ã‹ã€‚。。 ã¾ã‚ã€kernelnewbiesã®ãƒ¡ãƒ¼ãƒªãƒ³ã‚°ãƒªã‚¹ãƒˆã§ã‚‚よã見る話題ã‹ã¨æ€ã„ã¾ã™ã€‚ã“ã®è¾ºãªã‚“ã‹ã‚‚ãã†ã§ã™ã。 ã§ã€ãã‚“ãªæ™‚ã«ã‚ªã‚¹ã‚¹ãƒ¡ã§ãã‚‹ã®ãŒkmemleak。カーãƒãƒ«ã«çµ„ã¿è¾¼ã¾ã‚ŒãŸãƒ¡ãƒ¢ãƒªãƒ¼ãƒªãƒ¼ã‚¯æ¤œå‡ºãƒ„ールã§ã™ã€‚ 使ã„æ–¹ã¯è‡³ã£ã¦ç°¡å˜ã§ã‚«ãƒ¼ãƒãƒ«ã®ã‚³ãƒ³ãƒ•ã‚£ã‚°ãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ã«ã‚ã‚‹Kernel memory leak detectorを有効ã«ã—ãŸã‚«ãƒ¼ãƒãƒ«ã‚’普通ã«ä½¿ãˆã°OK。カーãƒãƒ«ã¯ãƒ¡ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã®rcã§ã‚‚tipã§ã‚‚linux-nextã§ã‚‚何ã§ã‚‚良ã„ã¨æ€ã„ã¾ã™ã€‚ è¨å®šã®å ´æ‰€ã¯Kernel Hacking -> Memory Debugging -> Kernel memory leak detectorã«ãƒã‚§ãƒƒã‚¯ã‚’ã™ã‚‹ã®ã¨ã€ ãã®ä¸‹ã®Maximum kmemleak early log ent
å°ã•ã„Linux環境ã®ä½œã‚Šæ–¹
å°ã•ã„Linux環境ã®ä½œã‚Šæ–¹ Presentation Transcript å°ã•ã„ Linux環境㮠作り方 Naomasa Matsubayashi ä¿å˜ã™ã‚‹ã‚¢ã‚¤ã‚³ãƒ³ フãƒãƒƒãƒ”ーディスク 2000年代åˆé フãƒãƒƒãƒ”ーディスクã«å¿…è¦ãªç‰©ãŒå…¨éƒ¨å…¥ã£ãŸ LinuxディストリビューションãŒæµè¡Œã£ãŸ floppix http://floppix.com/ HAL91 http://chris.silmor.de/hal91/ tomsrtbt http://www.toms.net/rb/ 3.5インãƒãƒ•ãƒãƒƒãƒ”ーディスクã®å®¹é‡ 1D 2D 1DD(Mac) 1DD 2DD(Mac) 2DD(PC-98) 2DD 2HD(PC-98) 2HD(PC/AT,Mac) 2ED 2TD 160KiB 360KiB 400KiB 360KiB 800KiB 640KiB 720KiB 1232KiB 1440
Pipe Logic
Delightfully useless epiphany: Suppose the null-byte is an electron. Then, /dev/zero provides an infinite supply of electrons and /dev/null has an infinite appetite for them. Let's call these devices Vss and Vdd, respectively. In this model, a UNIX pipe acts like a wire, that is, a conductor with parasitic capacitance. If the pipe is connected to Vss, its pipe buffer in kernel space quickly fills
naoyaã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼ - è² è·ã¨ã¯ä½•ã‹
調ã¹ã”ã¨ã‚’ã—ãŸã®ã§ blog ã«æ›¸ã„ã¦ç†è§£ã‚’æ·±ã‚よã†ã®ã‚³ãƒ¼ãƒŠãƒ¼ã§ã™ã€‚é•·æ–‡ã§ã™ã€‚ Linux ã§ã‚·ã‚¹ãƒ†ãƒ è² è·ã‚’è¦‹ã‚‹å ´åˆã«ãŠä¸–話ã«ãªã‚‹ã®ãŒ top ã‚„ sar (sysstat パッケージã«åŒæ¢±ã•ã‚Œã¦ã‚‹ã‚³ãƒžãƒ³ãƒ‰) ãªã©ã®ãƒ„ールã§ã™ã€‚ top ã§ã¯ã‚·ã‚¹ãƒ†ãƒ 統計ã®ã‚¹ãƒŠãƒƒãƒ—ショットを見るã“ã¨ãŒã§ãã¾ã™ã€‚今システムãŒã©ã†ã„ã†çŠ¶æ…‹ã‹ãªãƒ¼ã¨ã„ã†ã¨ã㯠top ãŒä¾¿åˆ©ã€‚ top - 08:16:54 up 3 days, 14:43, 6 users, load average: 0.18, 0.07, 0.03 Tasks: 43 total, 2 running, 41 sleeping, 0 stopped, 0 zombie Cpu(s): 18.2% us, 0.0% sy, 0.0% ni, 81.8% id, 0.0% wa, 0.0% hi, 0.0% si一方㮠sar ã§ã¯10分ã”ã¨ã®ã‚·
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Mapping DMA buffers to userspace
https://landley.net/writing/memory-faq.txt
http://www.makelinux.net/kernel_map/
Amazon.co.jp: Linuxカーãƒãƒ«2.6解èªå®¤: 高橋浩和, å°ç”°é€¸éƒŽ, 山幡為ä½ä¹…: 本
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