Re: [PATCH/RFC] mlx4_core: module param to limit msix vec allocation

[Eli Cohen <eli-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@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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