From: Paulo Marques <pmarques@grupopie.com>
To: Ian Godin <Ian.Godin@lowrydigital.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Drive performance bottleneck
Date: Thu, 03 Feb 2005 19:03:48 +0000 [thread overview]
Message-ID: <42027594.9090402@grupopie.com> (raw)
In-Reply-To: <ef0635f8b4257d18fad10882a2c79f64@lowrydigital.com>
Ian Godin wrote:
> [...]
> Definitely have been able to repeat that here, so the SG driver
> definitely appears to be broken. At least I'm glad I am not going
> insane, I was starting to wonder :)
>
> I'll run some more tests with O_DIRECT and such things, see if I can
> figure out what the REAL max speed is.
FYI there was a patch running around last April that made a new option
for "dd" to make it use O_DIRECT. You can get it here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=108135935629589&w=2
Unfortunately this hasn't made it into coreutils. IIRC there were issues
about dd being multi-platform and the way O_DIRECT was done in other
systems.
Anyway, you can patch dd yourself and have a tool for debugging with
O_DIRECT. I hope this helps,
--
Paulo Marques - www.grupopie.com
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke (1729 - 1797)
next prev parent reply other threads:[~2005-02-03 19:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-03 2:24 Drive performance bottleneck Ian Godin
2005-02-03 3:56 ` Bernd Eckenfels
2005-02-03 16:49 ` Ian Godin
2005-02-03 16:06 ` Jens Axboe
2005-02-03 17:40 ` Nuno Silva
2005-02-03 18:08 ` Ian Godin
2005-02-03 19:03 ` Paulo Marques [this message]
2005-02-04 19:36 ` Andy Isaacson
2005-02-04 9:32 ` Andrew Morton
2005-02-04 22:51 ` Lincoln Dale
2005-02-04 23:07 ` Andrew Morton
2005-02-06 4:25 ` Nuno Silva
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=42027594.9090402@grupopie.com \
--to=pmarques@grupopie.com \
--cc=Ian.Godin@lowrydigital.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.