From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
To: "MЕns RullgЕrd" <mru@users.sourceforge.net>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: DMA transfers in 2.5.67
Date: Wed, 16 Apr 2003 12:36:54 +0400 [thread overview]
Message-ID: <20030416123654.A2629@jurassic.park.msu.ru> (raw)
In-Reply-To: <yw1xptnne7lv.fsf@zaphod.guide>; from mru@users.sourceforge.net on Wed, Apr 16, 2003 at 12:09:00AM +0200
On Wed, Apr 16, 2003 at 12:09:00AM +0200, MЕns RullgЕrd wrote:
> Btw, I just noticed that hard disk throughput is much lower with 2.5
> than 2.4. With 2.4.21-pre5 I get ~40 MB/s, but with 2.5.67 the speed
> drops to 25-30 MB/s. Everything according to hdparm. Is it possible
> that DMA is generally slow for some reason?
Possible reason is that in 2.4 we've forced reasonable latency timer
value for all PCI devices, while in 2.5 we haven't as yet.
Ivan.
next prev parent reply other threads:[~2003-04-16 8:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-15 20:01 Måns Rullgård
2003-04-15 20:31 ` Alan Cox
2003-04-15 21:38 ` Måns Rullgård
2003-04-15 20:48 ` Alan Cox
2003-04-15 22:09 ` Måns Rullgård
2003-04-16 8:36 ` Ivan Kokshaysky [this message]
2003-04-16 8:43 ` Måns Rullgård
2003-04-16 8:59 ` Måns Rullgård
2003-04-16 9:30 ` Måns Rullgård
2003-04-16 10:01 ` Ivan Kokshaysky
2003-04-16 10:11 ` Måns Rullgård
2003-04-16 9:45 Chuck Ebbert
2003-04-16 10:11 ` Andrew Morton
2003-04-16 10:13 ` Andrew Morton
2003-04-16 10:13 ` Måns Rullgård
2003-04-18 11:25 Chuck Ebbert
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=20030416123654.A2629@jurassic.park.msu.ru \
--to=ink@jurassic.park.msu.ru \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=mru@users.sourceforge.net \
/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®