From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Hamie <hamish@travellingkiwi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ide-cs using 100% CPU
Date: Fri, 6 Aug 2004 20:27:47 +0100 [thread overview]
Message-ID: <20040806202747.H13948@flint.arm.linux.org.uk> (raw)
In-Reply-To: <40FA4328.4060304@travellingkiwi.com>; from hamish@travellingkiwi.com on Sun, Jul 18, 2004 at 10:30:16AM +0100
On Sun, Jul 18, 2004 at 10:30:16AM +0100, Hamie wrote:
> Anyone know why this happens? Something busy waiting? (BUt that should
> show as system cpu right?) or something taking out really long locks?
It'll be because IDE is using PIO to access the CF card, which could
have long access times (so reading a block of sectors could take some
time _and_ use CPU.) Obviously, PIO requires the use of the CPU, so
the CPU can't be handed off to some other task while this is occuring.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
next prev parent reply other threads:[~2004-08-06 19:31 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-18 9:30 ide-cs using 100% CPU Hamie
2004-08-06 19:27 ` Russell King [this message]
2004-08-06 19:33 ` Hamie
2004-08-06 19:38 ` Russell King
2004-08-07 17:55 ` Hamie
2004-08-07 22:26 ` Alan Cox
2004-08-08 9:03 ` Hamie
2004-08-08 15:24 ` Alan Cox
2004-08-09 9:57 ` Paulo Marques
2004-08-09 12:32 ` P
2004-08-09 20:11 ` Bill Davidsen
[not found] <fa.j0leddb.okcbor@ifi.uio.no>
[not found] ` <fa.goasld9.1q1kb05@ifi.uio.no>
2004-08-07 19:21 ` Robert Hancock
2004-08-08 15:24 ` Hamie
[not found] <fa.hhjr2f2.1ql2t80@ifi.uio.no>
[not found] ` <fa.ggacpdl.26on0d@ifi.uio.no>
2004-08-08 19:32 ` Robert Hancock
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=20040806202747.H13948@flint.arm.linux.org.uk \
--to=rmk+lkml@arm.linux.org.uk \
--cc=hamish@travellingkiwi.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