linux-kernel - Re: [PROBLEM] Hw problem or software bug? DMA: Out of SW-IOMMU space....

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Message-ID: <12bfabe40812071338y6bb47161le676ac9613b366cd@mail.gmail.com>
Date:	Sun, 7 Dec 2008 22:38:10 +0100
From:	"Giangiacomo Mariotti" <gg.mariotti@...il.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] Hw problem or software bug? DMA: Out of SW-IOMMU space....

On Sun, Dec 7, 2008 at 7:47 PM, Robert Hancock <hancockr@...w.ca> wrote:
>
> Seems like you have lots of disks, it could be you just have too much IO in
> flight at the same time for the size of the IOMMU area. You might be able to
> avoid that by increasing the SW-IOMMU size.
>
> However, your system should be AHCI capable, you should try to switch the
> SATA controller into that mode in the BIOS (possibly labelled RAID mode or
> something). Then it shouldn't need to use bounce buffers for disk access in
> the first place (plus give you NCQ support).
>
I've done what you said, now is there anything I can do to see if the
problem is solved? Use some program which produces a lot of IO? Is
there any suggested IO stress test available?
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