netdev - Re: linux-next network throughput performance regression

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Message-ID: <563D1180.60206@cumulusnetworks.com>
Date:	Fri, 6 Nov 2015 13:45:52 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Simon Xiao <sixiao@...rosoft.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

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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