RE: linux-next network throughput performance regression

[Simon Xiao]

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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