netdev - RE: ixgbe unstable performance at 1Gb/s

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Date:	Wed, 26 Sep 2012 20:22:04 +0000
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Charles Vejnar <Charles.Vejnar@...ge.ch>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: ixgbe unstable performance at 1Gb/s

>-----Original Message-----
>From: Charles Vejnar [mailto:Charles.Vejnar@...ge.ch]
>Sent: Wednesday, September 26, 2012 11:33 AM
>To: Tantilov, Emil S; netdev@...r.kernel.org
>Subject: Re: ixgbe unstable performance at 1Gb/s
>
>Le 25/09/2012 19:58, Tantilov, Emil S a écrit :
>>> -----Original Message-----
>>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>On
>>> Behalf Of Charles
>>> Sent: Monday, September 24, 2012 10:47 AM
>>> To: netdev@...r.kernel.org
>>> Subject: ixgbe unstable performance at 1Gb/s
>>>
>>> Hi,
>>>
>>> I hope I am posting on the right mailing-list. If not, sorry; please
>>> redirect me
>>> to the right place. Thanks.
>>>
>>> I have a new motherboard with integrated Intel X540 10GBase-T. For now,
>I
>>> want
>>> to use it at 1Gb/s.
>>>
>>> The bandwidth is only of ~300 Mbit/s (with Iperf). It's actually very
>>> unstable
>>> (always varies between 100 to 800 Mbit/s during the transfer).
>> Do you by any chance have CONFIG_IXGBE_PTP set in your kernel config?
>>
>> If so, try disabling it and see if it fixes your performance.
>>
>> Thanks,
>> Emil
>>
>Hi,
>
>Thanks for your reply.
>
>I compiled manually the ixgbe module with the default options of my
>distribution (Archlinux). I had the same problem.
>
>I then changed the CONFIG_IXGBE_PTP to no (default is yes) as you
>suggested, and recompiled. The problem disappeared; normal transfer.
>
>Could you please explain why this PTP is causing a problem? How can this
>be fixed without having to recompile the module (ethtool, /sys, bios...
>)? Thanks

This is actually a bug in the driver. We should have a patch out very soon to address it.

>
>Regards,
>
>Charles

Thanks,
Emil
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