netdev - Re: mlx4 2.6.31-rc5: SW2HW

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Message-ID: <alpine.DEB.1.10.0908191229280.32015@gentwo.org>
Date:	Wed, 19 Aug 2009 12:29:50 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Roland Dreier <rdreier@...co.com>
cc:	netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Subject: Re: mlx4 2.6.31-rc5: SW2HW_EQ failed.

On Wed, 19 Aug 2009, Roland Dreier wrote:

>  > We ran an old 2.6.26 debian kernel on this and it worked fine.
>
> The change to mlx4 to use multiple completion interrupts went in around
> 2.6.29 I think.  So that sort of explains why things would work with 2.6.26.

I also see a 2 usecs latency increase with 2.6.31 vs 2.6.30.

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