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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/