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[Bug 16348] kswapd continuously active when doing IO

To: xfs-masters@xxxxxxxxxxx
Subject: [Bug 16348] kswapd continuously active when doing IO
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Mon, 12 Jul 2010 22:50:47 GMT
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In-reply-to: <bug-16348-470@xxxxxxxxxxxxxxxxxxxxxxxxx/>
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https://bugzilla.kernel.org/show_bug.cgi?id=16348


Dave Chinner <david@xxxxxxxxxxxxx> changed:

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--- Comment #8 from Dave Chinner <david@xxxxxxxxxxxxx>  2010-07-12 22:50:26 ---
(In reply to comment #7)
> Here's the same situation on a 128 GB / 32 core server. It is doing some heavy
> I/O and very very unresponsive. This one is running 2.6.34-rc6:

These look like the new xfs inode cache shrinker is active. The dd is
generating memory pressure, and kswapd potentially running the slab shrinkers
reclaiming cached inodes. Can you show the output of slabtop before the dd and
while it is running?

Cheers,

Dave.

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