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 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
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