Messages in this thread | | | From | dave b <> | Date | Fri, 14 May 2010 22:53:51 +1000 | Subject | PROBLEM: oom killer and swap weirdness on 2.6.3* kernels |
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In 2.6.3* kernels (test case was performed on the 2.6.33.3 kernel) when physical memory runs out and there is a large swap partition - the system completely stalls.
I noticed that when running debian lenny using dm-crypt with encrypted / and swap with a 2.6.33.3 kernel (and all of the 2.6.3* series iirc) when all physical memory is used (swapiness was left at the default 60) the system hangs and does not respond. It can resume normal operation some time later - however it seems to take a *very* long time for the oom killer to come in. Obviously with swapoff this doesn't happen - the oom killer comes in and does its job.
free -m total used free shared buffers cached Mem: 1980 1101 879 0 58 201 -/+ buffers/cache: 840 1139 Swap: 24943 0 24943
My simple test case is
dd if=/dev/zero of=/tmp/stall and wait till /tmp fills...
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