linux-kernel - RE: linux-next network throughput performance regression

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Date:	Fri, 6 Nov 2015 21:18:57 +0000
From:	Simon Xiao <sixiao@...rosoft.com>
To:	David Ahern <dsa@...ulusnetworks.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	David Miller <davem@...emloft.net>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: linux-next network throughput performance regression

The .config file used to build linux-next kernel is attached to this mail.


> -----Original Message-----
> From: David Ahern [mailto:dsa@...ulusnetworks.com]
> Sent: Friday, November 6, 2015 12:46 PM
> To: Simon Xiao <sixiao@...rosoft.com>; devel@...uxdriverproject.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: David Miller <davem@...emloft.net>; KY Srinivasan
> <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>
> 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?

Download attachment "ATT25492.config" of type "application/octet-stream" (150571 bytes)