netdev - Re: how many msi (msi-x) vectors can be setup?

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Date:	Thu, 20 May 2010 10:04:25 +0800
From:	zhou rui <wirelesser@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	netdev@...r.kernel.org
Subject: Re: how many msi (msi-x) vectors can be setup?

it is kernel2.6.27, Intel(R) Xeon(R) CPU           E5540,64bit,16
processors.,so there should be 16 vectors?



On Thu, May 20, 2010 at 4:33 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Wed, May 19, 2010 at 8:18 AM, zhou rui <wirelesser@...il.com> wrote:
>> hi there:
>> how many msi (msi-x) vectors can be setup?
>> the number is limited by hardware resource(nic), or kernel ?
>> I found that the driver (broadcom 57711 ver 1.5.12) tried to request
>> 16 queues on my kernel2.6.27,but only 2  available
>> will it be increased if I update the driver or kernel?
>> and there is a limitiation in the system? if the other devices have
>> already occupied too many MSI vectors then it is not enough.
>
> from kernel 2.6.19 x86_64, there is per-cpu vector irq support.
>
> depends your system : CPU num? 64bit or 32bit.
>
> YH
>
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