The .config file used to build linux-next kernel is attached to this mail. > -----Original Message----- > From: David Ahern [mailto:dsa@xxxxxxxxxxxxxxxxxxx] > Sent: Friday, November 6, 2015 12:46 PM > To: Simon Xiao <sixiao@xxxxxxxxxxxxx>; devel@xxxxxxxxxxxxxxxxxxxxxx; > netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Cc: David Miller <davem@xxxxxxxxxxxxx>; KY Srinivasan > <kys@xxxxxxxxxxxxx>; Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Subject: Re: linux-next network throughput performance regression > > On 11/6/15 1:31 PM, Simon Xiao wrote: > > I compared the network throughput performance on SLES12 bare metal > servers, between SLES12 default kernel and latest linux-next (2015-11-05) > kernel, based on the test results, I suspect there is a network regression > exists on Linux-Next over the 40G Ethernet network: > > a) iperf3 reports 50% performance drop with single TCP stream on > > latest linux-next; > > b) iperf3 reports 10% ~ 30% performance drop with 2 to 128 TCP streams > > on latest linux-next; Another throughput benchmarking tool (ntttcp-for- > linux) test result is also listed at the end of the email for reference. > > > > Can you post your kernel config file?
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