netdev - Re: mlx4 2.6.31-rc5: SW2HW

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Message-ID: <adaeir7256h.fsf@cisco.com>
Date:	Wed, 19 Aug 2009 08:29:10 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Subject: Re: mlx4 2.6.31-rc5: SW2HW_EQ failed.

 > Correct. My Dell R620 may have some weird ACPI info.
 > 
 > SMP: Allowing 32 CPUs, 16 hotplug CPUs
 > 
 > although the box does not have any slots for "hotplugging".

I guess you could try booting with "possible_cpus=16" and see how that
affects things...

 > The patch does not fix the issue so far. We are having various hangs and
 > are trying to figure out what is gong on.

Sounds like the patch lets you get farther?  What kind of hangs do you
get?  Still mlx4-related?

 > 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.

 - R.
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