From: Eli Cohen <eli-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
To: Arthur Kepner <akepner-sJ/iWh9BUns@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH/RFC] mlx4_core: module param to limit msix vec allocation
Date: Sun, 13 Jun 2010 09:53:24 +0300 [thread overview]
Message-ID: <20100613065324.GA2408@eli-vm> (raw)
In-Reply-To: <20100610165921.GF22247-sJ/iWh9BUns@public.gmane.org>
On Thu, Jun 10, 2010 at 09:59:21AM -0700, Arthur Kepner wrote:
>
> The mlx4_core driver allocates 'nreq' msix vectors (and irqs),
> where:
>
> nreq = min_t(int, dev->caps.num_eqs - dev->caps.reserved_eqs,
> num_possible_cpus() + 1);
>
> ConnectX HCAs support 512 event queues (4 reserved). On a system
> with enough processors, we get:
>
> mlx4_core 0006:01:00.0: Requested 508 vectors, but only 256 MSI-X vectors available, trying again
>
> Further attempts (by other drivers) to allocate interrupts fail,
> because mlx4_core got 'em all.
>
> How about this?
>
Hi Arthur,
how many CPU cores are in your system? What kernel version did you
use?
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next prev parent reply other threads:[~2010-06-13 6:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-10 16:59 [PATCH/RFC] mlx4_core: module param to limit msix vec allocation Arthur Kepner
[not found] ` <20100610165921.GF22247-sJ/iWh9BUns@public.gmane.org>
2010-06-13 6:53 ` Eli Cohen [this message]
2010-06-14 15:23 ` Arthur Kepner
2010-06-17 14:53 ` Yevgeny Petrilin
[not found] ` <E113D394D7C5DB4F8FF691FA7EE9DB4439A77CCD66-WQlSmcKwN8Te+A/uUDamNg@public.gmane.org>
2010-06-17 21:27 ` Arthur Kepner
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