linux-kernel - Re: 2.6.21-rt9 - IRQ23 consuming a steady 2.7% of CPU

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Date:	Sun, 10 Jun 2007 10:38:05 -0700
From:	"Mark Knecht" <markknecht@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"Lee Revell" <rlrevell@...il.com>
Subject: Re: 2.6.21-rt9 - IRQ23 consuming a steady 2.7% of CPU

On 6/10/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Mark Knecht <markknecht@...il.com> wrote:
>
> > 23:    1739277   IO-APIC-fasteoi   ohci_hcd:usb2, eth0
>
> > 00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
>
> ok, that's forcedeth. Does that behavior go away if you revert the
> change below, via patch -p0 -R ?
>
> but in general, -rt will track IRQ cpu usage accurately, while mainline
> does not measure it at all when in idle. So a frequent IRQ on mainline
> might be using up similar amounts of of CPU time as well, but it's not
> reported.
>
>         Ingo
>

Ingo,
   GMail is being kranky. Can you please send the patch as a zipped attachment?

Thanks,
Mark
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