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Date:	Tue, 25 Sep 2012 17:58:38 +0000
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Charles <charles.vejnar@...ge.ch>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: ixgbe unstable performance at 1Gb/s

>-----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

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