From: tony@bakeyournoodle.com (Tony Breeds)
To: Frederik Himpe <fhimpe@telenet.be>
Cc: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net
Subject: Re: 2.6.24-rc3-git3: usb hardware interrupts using 25% of CPU time
Date: Thu, 29 Nov 2007 09:40:20 +1100 [thread overview]
Message-ID: <20071128224020.GE24243@bakeyournoodle.com> (raw)
In-Reply-To: <pan.2007.11.28.22.33.18@telenet.be>
On Wed, Nov 28, 2007 at 10:33:18PM +0000, Frederik Himpe wrote:
> I installed Linux 2.6.24-rc3-git3 on a PPC based Apple Powerbook G4
> system. Now with top I see that over 20% of CPU time is used by hardware
> interrupts. Looking at /proc/interrupts, the number in the row
> ohci_hcd:usb1 is rising very quickly:
Hi Frederik,
Thanks for the report. We suspect that this is an accounting
problem introduced when powerpc enabled NO_HZ and highres timers.
Fortunatley from the testing we've done it doens't actually look like
the time is being spent in hardware interupts, just accounted for there.
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2008.linux.org.au/
Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!
next prev parent reply other threads:[~2007-11-28 22:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-28 22:33 2.6.24-rc3-git3: usb hardware interrupts using 25% of CPU time Frederik Himpe
2007-11-28 22:40 ` Tony Breeds [this message]
2007-11-28 23:02 ` Rafael J. Wysocki
2007-11-28 22:50 ` Frederik Himpe
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