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Message-ID: <1381461664.4971.97.camel@edumazet-glaptop.roam.corp.google.com> Date: Thu, 10 Oct 2013 20:21:04 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Kyle Hubert <khubert@...il.com> Cc: netdev@...r.kernel.org Subject: Re: Peak TCP performance On Thu, 2013-10-10 at 22:34 -0400, Kyle Hubert wrote: > I'm working on a device, I consistently get 27gbps via netperf-2.6. > UDP reports 54gbps. > > TCP is maxed out at 100% CPU on the transmit side. On the receive > side, 40% of the CPU. Thus, I didn't believe I could eek anymore > performance out of it. > > However, very oddly, if I enabled bridged mode to forward some > packets, TCP performance goes up to 32gbps. The thing that bothers me > is that transmit CPU utilization drops to 65%, and receive CPU > utilization increases to 60%. > > What happens when the device becomes bridged to gain so much > performance? Also, can I now take advantage of the extra CPU time > available to drive more traffic? No tunable seems to have any effect.. > (except down) You do not give what version of linux you use, but my guess is that using latest trees should help, because of http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=c9eeec26e32e087359160406f96e0949b3cc6f10 Also try to disable tx-nocache-copy ethtool -K eth0 tx-nocache-copy off -- 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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