linux-kernel - Is there a way to change irq numbers of pcie cards ?

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Message-ID: <AANLkTinfWMJ94pPxjRAx-vgvcqSwE9Hw3kHqEDLazhZ2@mail.gmail.com>
Date:	Wed, 2 Jun 2010 12:08:33 +0000
From:	Bert dd <bert.ddecker@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Is there a way to change irq numbers of pcie cards ?

Hi,
Is there a way to change irq numbers of pcie cards ?

I have a supermicro machine with 2 raid cards (lsi 9260-8i and lsi 9260-8e) and
one nvidia GTX480 graphics card.
The problem is that all these pcie cards are assigned the same irq number,
and thus all the interrupts are routed to the same cpu which can not
handle this.
If I replace the nvidia GTX480 with an older graphics card(too old for
our purposes (GTX295)), the graphics card gets a different irq number
than the raid cards, the interrups of the graphics card are handled by
a different cpu than those of the raid cards, and the read/write speed
of the raid increases.
I am reading/writing at 2.5 GB/s to the raid and I am uploading
textures at 0.5 GB/s to the graphics hardware.
Is there a way to change the irq numbers of the pcie cards ?
I am using IOAPIC for interrupt routing.
I am using ubuntu - kernel version 2.6.31-14-generic.

thanks,
  Bert De Decker
  bert.dedecker@...sselt.be
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