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07.23.2008 at 12:48AM PDT, ID: 23587630
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Strange Linux VM(swap) behaviour

Asked by ravenpl in Linux, Linux Administration

32bit Fedora7, 2.6.23.17-88.fc7PAE, 16G ram, 12G swap, 4cpu

Recently I observed strange VM behaviour twice.
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. Requires processes were brought back to ram and server become responsible.

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?

BTW: vm.swappiness was decreased to 30, to avoid excessive swap usage, but no avail.
BTW: it's production machine, so reboots are to be avoidStart Free Trial
[+][-]07.23.2008 at 07:47AM PDT, ID: 22069878

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[+][-]07.23.2008 at 07:51AM PDT, ID: 22069920

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[+][-]07.23.2008 at 07:59AM PDT, ID: 22070003

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[+][-]07.23.2008 at 08:14AM PDT, ID: 22070147

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[+][-]07.23.2008 at 09:06AM PDT, ID: 22070719

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[+][-]07.23.2008 at 04:55PM PDT, ID: 22075015

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[+][-]07.23.2008 at 10:47PM PDT, ID: 22076358

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[+][-]07.24.2008 at 02:26AM PDT, ID: 22077285

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[+][-]07.24.2008 at 05:43AM PDT, ID: 22078411

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[+][-]07.24.2008 at 05:48AM PDT, ID: 22078478

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[+][-]07.24.2008 at 06:00AM PDT, ID: 22078584

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[+][-]07.24.2008 at 09:28AM PDT, ID: 22080929

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About this solution

Zones: Linux, Linux Administration
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Solution Provided By: ravenpl
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.24.2008 at 05:44PM PDT, ID: 22085082

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[+][-]07.25.2008 at 12:05AM PDT, ID: 22086524

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