netdev - Re: [BUG] net: performance regression on ixgbe (Intel 82599EB 10-Gigabit NIC)

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Message-ID: <566078AA.5040804@gmail.com>
Date:	Thu, 3 Dec 2015 09:15:22 -0800
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Otto Sabart <osabart@...hat.com>, netdev@...r.kernel.org
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jirka Hladky <jhladky@...hat.com>,
	Adam Okuliar <aokuliar@...hat.com>,
	Kamil Kolakowski <kkolakow@...hat.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>
Subject: Re: [BUG] net: performance regression on ixgbe (Intel 82599EB
 10-Gigabit NIC)

On 12/03/2015 08:26 AM, Otto Sabart wrote:
> Hello netdev,
> I probably found a performance regression on ixgbe (Intel 82599EB
> 10-Gigabit NIC) on v4.4-rc3. I am able to see this problem since
> v4.4-rc1.
>
> The bug report you can find here [0].
>
> Can somebody take a look at it?
>
> [0] https://bugzilla.redhat.com/show_bug.cgi?id=1288124
>
>
> thanks,
> Ota

Hi Ota,

It looks like there were a few changes that went through that could be 
causing the regression.  The most obvious one that jumps out at me is 
commit 72bfd32d2f84 ("ixgbe: disable LRO by default").  As such one 
thing you might try doing is turning on LRO support via ethtool -k to 
see if that is the issue you are seeing.

If that doesn't resolve the issue it would be useful if you could might 
try doing a git bisect to narrow this down to a specific patch.

Thanks.

- Alex

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