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

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Message-ID: <AANLkTimrQPhPomBC-x-E0b9BKDUmO2j2flZp_Qm2aAtK@mail.gmail.com>
Date:	Wed, 19 May 2010 13:33:20 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	zhou rui <wirelesser@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: how many msi (msi-x) vectors can be setup?

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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