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Date: Tue, 21 Feb 2012 20:53:51 +0200 From: alekcejk@...glemail.com To: Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org Subject: Re: Re: Re: Re: limited network bandwidth with 3.2.x kernels В сообщении от Вторник 21 февраля 2012 18:31:24 вы написали: > Le mardi 21 février 2012 à 19:19 +0200, alekcejk@...glemail.com a > > écrit : > > Download speed from ftp3.de.freebsd.org increases from 5 MB/s to 10 MB/s > > after I set "sysctl net.ipv4.tcp_rmem="4096 87380 4127616""" in 3.2.7 kernel. > > > > --2012-02-21 18:56:36-- ftp://ftp3.de.freebsd.org/pub/FreeBSD/ISO-IMAGES-i386/8.2/FreeBSD-8.2-RELEASE-i386-dvd1.iso.xz > > 100%[======================================>] 2 066 424 512 10,3M/s in 3m 17s > > 2012-02-21 18:59:56 (9,99 MB/s) - «/dev/null» saved [2066424512] > > Yep, this confirms the thing. You were at the limit of optimal receiver > window. Find a more remote server (80ms rtt for example) and you'll see > that your default tcp_rmem[2] was too small, even on 3.1.10 kernel. I confirm that 3.1.10 kernel also have similar problems with speed. Download speed from dl.fedoraproject.org(209.132.181.24, rtt 190ms) increased after I set "sysctl net.ipv4.tcp_rmem="4096 87380 4127616""" If net.ipv4.tcp_rmem = 4096 87380 897664 then I have exactly 3.5 MB/s speed limitation: http://img3.imageshack.us/img3/28/netipv4tcprmem409687380.png --2012-02-21 20:25:10-- http://dl.fedoraproject.org/pub/fedora/linux/releases/16/Fedora/i386/iso/Fedora-16-i386-DVD.iso 100%[============================>] 3 806 375 936 3,28M/s in 20m 45s 2012-02-21 20:45:56 (2,92 MB/s) - «/dev/null» saved [3806375936/3806375936] But if net.ipv4.tcp_rmem = 4096 87380 4127616 no such limitation, download speed vary in some ranges but it can be larger than 3,5 MB/s: http://img27.imageshack.us/img27/28/netipv4tcprmem409687380.png --2012-02-21 20:09:56-- http://dl.fedoraproject.org/pub/fedora/linux/releases/16/Fedora/i386/iso/Fedora-16-i386-DVD.iso 00%[==============================>] 3 806 375 936 4,65M/s im 13m 3s 2012-02-21 20:22:59 (4,64 MB/s) - «/dev/null» saved [3806375936/3806375936] -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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