From: Rafal Wijata <devnull@wijata.com>
To: linux-kernel@vger.kernel.org
Subject: Odd swapping issue
Date: Wed, 23 Jul 2008 18:53:04 +0200 [thread overview]
Message-ID: <488761F0.4040906@wijata.com> (raw)
It happened twice recently(within one week), therefore I'm posting here.
32bit Fedora7, 2.6.23.17-88.fc7PAE, 16G ram, 12G swap, 2*dualXeon
My machine went sluggish. Tried to debug it, and observed, that free
ram(the unused one) was increasing while swap usage was increasing as
well. It stopped after whole swap partition was used. Then it came back
normal. Required processes were brought back to ram and server become
responsible again.
Now the most strange thing is that there was 5G free(unused) ram, during
those few minutes it growed to 12G! In the very same time swap usage
increased from ~4G to 12G.
This is irrational to me. Can anybody explain? How to prevent?
vm.swappiness was decreased to 30, to avoid excessive swap usage, but no
avail.
It's application and nfs server/client if it matters. During that
"memory sweep" I observed many nfsd processes(kernel threads?) in D state.
next reply other threads:[~2008-07-23 17:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-23 16:53 Rafal Wijata [this message]
2008-07-23 17:50 ` Odd swapping issue Peter Zijlstra
2008-07-23 21:17 ` David Newall
2008-07-24 2:20 ` Dan Noé
2008-07-24 6:39 ` Peter Zijlstra
2008-07-24 11:51 ` KOSAKI Motohiro
2008-07-24 13:45 ` Rafal Wijata (NULL)
2008-07-24 13:58 ` Peter Zijlstra
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