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Date: Wed, 20 Jun 2012 12:06:28 +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 11:50 +0200, Stefan Priebe - Profihost AG wrote: > Am 20.06.2012 11:47, schrieb Eric Dumazet: > > On Wed, 2012-06-20 at 11:33 +0200, Stefan Priebe - Profihost AG wrote: > > > >> Sure. In that case i get 4Gbit/s in both variants. I also tried two > >> other different machines same result. > >> > > > > So 3.5 on receiver is the problem, it seems ? > Yes. > > > And you checked all the stuff about irq affinities, i presume, since a > > lot of things might have changed between 2.6.32 and 3.5 ? > > It is a single core E5 Xeon - i've set the affinity like this: And you still have the retransmits in "netstat -s" output ? Might be a firmware or pci issue, I have same cards but no problem here. Check LRO is on ? ethtool -k eth2 -- 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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