linux-kernel - Re: extreme system load [kswapd]

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Message-ID: <CA+pWcCaExwnth+KtFEyJhqODWbPsMA5O+toooF+mjueDg3GxuA@mail.gmail.com>
Date:	Thu, 12 Apr 2012 13:35:33 +0200
From:	Karol Šebesta <sebesta.karol@...il.com>
To:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: extreme system load [kswapd]

Hello Rik,

Thank you for answer, but now we are facing to another interesting
issue on our redhat 5.6 server.

It seems that linux dropped almost all disk cache and now it trying to
gain disk cache space by swapping. That is the reason why kswapd
process loads the system.

### as you can see almost all RAM is free ( that is bad ) - some time
ago there was all RAM cached in disk cache

[root@...u0216 ~]# free -m
             total       used       free     shared    buffers     cached
Mem:        128861      29814      99047          0        108      20186
-/+ buffers/cache:       9519     119342
Swap:        81919      16614      65305
[root@...u0216 ~]#


Do you think that can be a problem with NUMA nodes or what can be the
reason that Linux itself dropped almost all disk cache?

Thank you.

Regards,

Karol Sebesta
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