From: "Giangiacomo Mariotti" <gg.mariotti@gmail.com>
To: "Robert Hancock" <hancockr@shaw.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PROBLEM] Hw problem or software bug? DMA: Out of SW-IOMMU space....
Date: Sun, 7 Dec 2008 22:38:10 +0100 [thread overview]
Message-ID: <12bfabe40812071338y6bb47161le676ac9613b366cd@mail.gmail.com> (raw)
In-Reply-To: <493C1A2C.3080801@shaw.ca>
On Sun, Dec 7, 2008 at 7:47 PM, Robert Hancock <hancockr@shaw.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?
prev parent reply other threads:[~2008-12-07 21:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-07 3:48 Giangiacomo Mariotti
2008-12-07 11:35 ` Alan Cox
2008-12-07 12:47 ` Giangiacomo Mariotti
2008-12-07 18:47 ` Robert Hancock
2008-12-07 21:38 ` Giangiacomo Mariotti [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=12bfabe40812071338y6bb47161le676ac9613b366cd@mail.gmail.com \
--to=gg.mariotti@gmail.com \
--cc=hancockr@shaw.ca \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®