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Date:	Tue, 25 Sep 2012 17:58:38 +0000
From:	"Tantilov, Emil S" <>
To:	Charles <>,
	"" <>
Subject: RE: ixgbe unstable performance at 1Gb/s

>-----Original Message-----
>From: [] On
>Behalf Of Charles
>Sent: Monday, September 24, 2012 10:47 AM
>Subject: ixgbe unstable performance at 1Gb/s
>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
>to use it at 1Gb/s.
>The bandwidth is only of ~300 Mbit/s (with Iperf). It's actually very
>(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. 


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