From: Charles Vejnar <Charles.Vejnar@unige.ch>
To: "Tantilov, Emil S" <emil.s.tantilov@intel.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>
Subject: Re: ixgbe unstable performance at 1Gb/s
Date: Thu, 27 Sep 2012 10:32:59 +0200 [thread overview]
Message-ID: <50640F3B.6030102@unige.ch> (raw)
In-Reply-To: <87618083B2453E4A8714035B62D6799216E25F9C@FMSMSX102.amr.corp.intel.com>
Le 26/09/2012 22:22, Tantilov, Emil S a écrit :
>> -----Original Message-----
>> From: Charles Vejnar [mailto:Charles.Vejnar@unige.ch]
>> Sent: Wednesday, September 26, 2012 11:33 AM
>> To: Tantilov, Emil S; netdev@vger.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@vger.kernel.org [mailto:netdev-owner@vger.kernel.org]
>> On
>>>> Behalf Of Charles
>>>> Sent: Monday, September 24, 2012 10:47 AM
>>>> To: netdev@vger.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
prev parent reply other threads:[~2012-09-27 8:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-24 17:47 ixgbe unstable performance at 1Gb/s Charles
2012-09-25 17:58 ` Tantilov, Emil S
2012-09-26 18:33 ` Charles Vejnar
2012-09-26 20:22 ` Tantilov, Emil S
2012-09-27 8:32 ` Charles Vejnar [this message]
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