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

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Date:	Thu, 27 Sep 2012 10:32:59 +0200
From:	Charles Vejnar <Charles.Vejnar@...ge.ch>
To:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: ixgbe unstable performance at 1Gb/s

Le 26/09/2012 22:22, Tantilov, Emil S a écrit :
>> -----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
Hi Emil,

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

OK. Please send a reply to this thread when it's available. I can test 
the patch.

Thanks

Charles

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