From: Ferenc Engard <ferenc@engard.hu>
To: Keyser Soze <keyser_soze2u@yahoo.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Geode GX1, video acceleration -> crash
Date: Fri, 11 Jul 2003 23:10:14 +0200 [thread overview]
Message-ID: <3F0F27B6.9B7DAAE2@engard.hu> (raw)
In-Reply-To: 20030711181025.14633.qmail@web10001.mail.yahoo.com
Keyser Soze wrote:
>
> > But the real problem is, that I wanted to benchmark
> > the system while the scrolling continues, and issued
> > a dd if=/dev/mem of=/dev/null bs=1024 count=32768
> > command. For the second go, the system freezed like
> > a good refrigerator. No kernel panic, nothing, just
> > freezed.
>
> Try turning off ide dma and see if that helps. You
> will lose very little by turning off udma on this
> system and I'll bet you end up being more stable.
I will try it on Monday, as the eval board is in my workplace. What is
the connection between ide dma, memory read and the hw video accel? The
ide dma setting alters the way /dev/mem is read? :-O
I had a feeling that maybe it is a dma-related problem, but I do not
know what does 'dd if=/dev/mem......' _really_ do. It uses a dma
channel? The GX1 manual do not mention that the bitblk engine use up
dma; in fact, I do think that it is a serious design error that using
the bitlbk engine alters the way the memory can be used (except memory
bandwith usage, naturally).
Anyway, if it solves the problem, I must understand why happened this
error. The product will be a medical bedside monitor; so it is not
enough that it is now _more_ stable, I have to know the origin of the
problem.
I can tell you more on Monday,
Circum
PS: The system will run from flash (on IDE controller), so I suspect
that it will be a _real big_ slowdown if in the last product I have to
turn of the dma, but hopefully there will be no gigabytes of data...
next prev parent reply other threads:[~2003-07-11 20:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-11 18:10 Geode GX1, video acceleration -> crash Keyser Soze
2003-07-11 18:27 ` Alan Cox
2003-07-11 21:10 ` Ferenc Engard [this message]
2003-07-12 17:04 ` Jan Rychter
-- strict thread matches above, loose matches on Subject: below --
2003-07-03 16:24 Ferenc Engard
2003-07-03 19:56 ` Alan Cox
2003-07-03 22:37 ` NunO fELICIO
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=3F0F27B6.9B7DAAE2@engard.hu \
--to=ferenc@engard.hu \
--cc=keyser_soze2u@yahoo.com \
--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;
as well as URLs for NNTP newsgroup(s).