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Message-ID: <20121229182900.GA17324@paralelels.com> Date: Sat, 29 Dec 2012 22:29:01 +0400 From: Andrew Vagin <avagin@...allels.com> To: Eric Dumazet <erdnetdev@...il.com> CC: <netdev@...r.kernel.org>, <vvs@...allels.com>, Michał Mirosław <mirq-linux@...e.qmqm.pl> Subject: Re: Slow speed of tcp connections in a network namespace On Sat, Dec 29, 2012 at 09:40:28AM -0800, Eric Dumazet wrote: > On Sat, 2012-12-29 at 18:50 +0400, Andrew Vagin wrote: > > On Sat, Dec 29, 2012 at 05:53:23AM -0800, Eric Dumazet wrote: > > > > 3.8-rc1 is used for experiments. > > > > > > > > Do you have any ideas where is a problem? > > > > > > veth has absolutely no offload features > > > > > > It needs some care... > > > > > > At the very miminum, let TCP coalesce do its job by allowing SG > > > > > > CC Michał Mirosław <mirq-linux@...e.qmqm.pl> for insights. > > > > > > Please try following patch : > > > > Hello Eric, > > > > Thanks for your feedback. > > > > With this patch the results is a bit better (~4MB/s), but it's much less > > than in the root netns. > > Please post your new tcpdump then ;) I have rebooted the host and a speed in a netns is again about 1.7MB/s. I don't know why it was 4MB/s in the previous time. new tcpdump and netstat are attached > > also post "netstat -s" from root and test ns after your wgets > > > Download attachment "tcpdump.host.gz" of type "application/x-gzip" (165716 bytes) Download attachment "tcpdump.netns.host.gz" of type "application/x-gzip" (180703 bytes) Download attachment "tcpdump.netns.veth.gz" of type "application/x-gzip" (181615 bytes) View attachment "netstat.host" of type "text/plain" (1821 bytes) View attachment "netstat.netns" of type "text/plain" (1464 bytes)
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