netdev - Re: mlx4 2.6.31-rc5: SW2HW

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Message-ID: <adaljlg1e0x.fsf@cisco.com>
Date:	Wed, 19 Aug 2009 00:03:26 -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.

By the way, my dual-socket nehalem EP system says:

    SMP: Allowing 16 CPUs, 0 hotplug CPUs

which I think (haven't checked but the code sure looks that way) means
that num_possible_cpus() is 16.  This is a supermicro workstation board,
forget the exact model.

And the fact that your system is different is not really a bug -- it
just points to slightly incorrect data somewhere, most likely ACPI
tables; having 32 possible CPUs on a system that can only ever really
have 16 CPUs just leads to some overallocations, and tickles the mlx4
bug where it can't handle more than 32 interrupts).

Just FWIW.

 - R.
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