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Message-ID: <1340176940.4604.801.camel@edumazet-glaptop> Date: Wed, 20 Jun 2012 09:22:20 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Stefan Priebe - Profihost AG <s.priebe@...fihost.ag> Cc: Linux Netdev List <netdev@...r.kernel.org> Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0 On Wed, 2012-06-20 at 09:00 +0200, Stefan Priebe - Profihost AG wrote: > Am 19.06.2012 23:31, schrieb Eric Dumazet: > > On Tue, 2012-06-19 at 23:08 +0200, Stefan Priebe wrote: > >> i'm testing 10GBE speed with tweo servers. One with 3.5-rc3 nd thoe > >> other one whith RHEL 6 (2.6.32 kernel). > >> > >> I noticed that setting > >> net.ipv4.tcp_timestamps=0 > >> > >> descreased the performance from 9,7 Full Duplex to 3-4Gb/s. > >> > >> Is this bahviour fine? What should / could i tet? > >> > > > > Really, you should provide more input than that, if you really want us > > to help. > > *arg* forgot to add the pastebin links. Sorry. Speed degraded in this > case from 9,88Gbit/s to 2,45Gbit/s. When i turn on timestamps it's > perfect again. Server A has 3.5.0-rc3 and server B has an RHEL6 2.6.32 > kernel. > > Before: > http://pastebin.com/raw.php?i=1gVraWVc > > After: > http://pastebin.com/raw.php?i=NSh8Y29s You have a lot of packet losses add "tc -s -d qdisc" , "ifconfig -a " and "ethtool -S ethX" outputs for both servers -- 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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