From: Dave Chinner <david@fromorbit.com>
To: Mark <musicman529@yahoo.com>
Cc: xfs@oss.sgi.com
Subject: Re: XFS mkfs/mount options
Date: Tue, 17 Jun 2008 17:41:58 +1000 [thread overview]
Message-ID: <20080617074158.GQ3700@disturbed> (raw)
In-Reply-To: <881489.19090.qm@web34506.mail.mud.yahoo.com>
On Tue, Jun 17, 2008 at 12:33:57AM -0700, Mark wrote:
> I have been doing some experiments with XFS on my "hot new desktop
> system," and I have turned up an interesting bit of info. (Note:
> My system is an AMD64 X2 2.5GHz running Linux.)
>
> When I mount an XFS volume (thus loading the xfs kernel module),
> the kernel spawns two CPU-bound threads for "xfslogd" and
> "xfsdatad". However, it appears that only one of each of these
> kernel processes is getting any load, as indicated by "ps ax":
>
> 3700 ? S< 0:00 [xfslogd/0]
> 3701 ? S< 0:19 [xfslogd/1]
> 3702 ? S< 0:00 [xfsdatad/0]
> 3703 ? D< 0:05 [xfsdatad/1]
>
> For each of these kernel threads, only those on CPU #2 are actually pulling notable load. Why is this?
Because your disk interrupts are delivered to that CPU only.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2008-06-17 7:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-17 7:33 XFS mkfs/mount options Mark
2008-06-17 7:41 ` Dave Chinner [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-06-17 9:20 Mark
2008-06-17 12:27 ` Justin Piszcz
2008-06-17 17:29 Mark
2008-06-17 20:41 ` Martin Steigerwald
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