linux-kernel - Re: idle RAID1 cpu usage

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Message-Id: <200612271949.50723.s0348365@sms.ed.ac.uk>
Date:	Wed, 27 Dec 2006 19:49:50 +0000
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Paul Slootman <paul+nospam@...tel.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: idle RAID1 cpu usage

On Wednesday 27 December 2006 18:09, Paul Slootman wrote:
[snip]
> My question is: why is CPU being used by the RAID1 threads, even for
> those devices that are otherwise unused? What are they doing?
> I even started distributed-net to check that it wasn't just idle CPU
> cycles that were being used :-)
>
> Note: it did seem that the activity was a bit more during the first
> day after booting; in fact, the mdX_raid1 threads together had used
> about one hour's worth of CPU in the first 24 hours, i.e. 4% CPU
> (according to ps and top).

Sounds like a bug to me. My box is x86_64, but it's been up for 2 days and one 
unmounted md_raid5 has used 0 minutes, 0 seconds of CPU, which is what I'd 
expect.

Maybe it's some sort of accounting problem on SPARC?

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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