From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
Cc: Eli Cohen <eli-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>,
Linux RDMA list
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
ewg <ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>
Subject: Re: [PATCH] mlx4_core: request MSIX vectors as much as there CPU cores
Date: Wed, 5 May 2010 10:32:52 -0600 [thread overview]
Message-ID: <20100505163252.GG15969@obsidianresearch.com> (raw)
In-Reply-To: <adahbmmpfep.fsf-BjVyx320WGW9gfZ95n9DRSW4+XlvGpQz@public.gmane.org>
On Wed, May 05, 2010 at 07:54:54AM -0700, Roland Dreier wrote:
> > The current code requires num_possible_cpus() + 1 MSIX vectors. However,
> > num_possible_cpus() stands for the max number of supported CPUs by the kernel.
>
> I believe this is wrong -- num_possible_cpus() is the maximum number of
> CPUs for the running system, including hotplug.
FWIW, I've seen some systems running RH kernels that blow up here
because they run out of interrupt numbers if you have two IB cards in
them.
Mainline kernels have a reworked IRQ number allocator and don't have a
problem, so maybe this is an ofed only patch?
Jason
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next prev parent reply other threads:[~2010-05-05 16:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 11:30 [PATCH] mlx4_core: request MSIX vectors as much as there CPU cores Eli Cohen
[not found] ` <20100505113047.GA12242-8YAHvHwT2UEvbXDkjdHOrw/a8Rv0c6iv@public.gmane.org>
2010-05-05 14:54 ` Roland Dreier
[not found] ` <adahbmmpfep.fsf-BjVyx320WGW9gfZ95n9DRSW4+XlvGpQz@public.gmane.org>
2010-05-05 16:32 ` Jason Gunthorpe [this message]
[not found] ` <20100505163252.GG15969-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-05-05 19:34 ` [ewg] " Tziporet Koren
[not found] ` <4BE1C82F.4000009-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>
2010-05-05 19:51 ` Roland Dreier
[not found] ` <adaaasejfew.fsf-BjVyx320WGW9gfZ95n9DRSW4+XlvGpQz@public.gmane.org>
2010-05-05 19:55 ` Roland Dreier
[not found] ` <ada6332jf79.fsf-BjVyx320WGW9gfZ95n9DRSW4+XlvGpQz@public.gmane.org>
2010-05-06 7:49 ` [ewg] " Eli Cohen
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