From: mru@users.sourceforge.net (Måns Rullgård)
To: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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: 16 Apr 2003 10:43:47 +0200 [thread overview]
Message-ID: <yw1xk7duessc.fsf@zaphod.guide> (raw)
In-Reply-To: <20030416123654.A2629@jurassic.park.msu.ru>
Ivan Kokshaysky <ink@jurassic.park.msu.ru> writes:
> On Wed, Apr 16, 2003 at 12:09:00AM +0200, Måns Rullgård 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.
Do you mean whatever causes this message (for a 3com NIC)?
PCI: Setting latency timer of device 00:05.0 to 64
Would that also explain why my hard disks are slow under 2.5? There
is no corresponding message for the ide controller (htp374).
--
Måns Rullgård
mru@users.sf.net
next prev parent reply other threads:[~2003-04-16 8:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-15 20:01 DMA transfers in 2.5.67 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
2003-04-16 8:43 ` Måns Rullgård [this message]
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
-- strict thread matches above, loose matches on Subject: below --
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
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