Re: Fixing page allocation failure
From: Nick Piggin
Date: Thu Nov 18 2004 - 07:12:07 EST
Morten W. Petersen wrote:
Hi all,
I have a server that a couple of times each day squirts out messages
about page allocation failures (python: page allocation failure.
order:3, mode:0x20). What's the reason for this, and could it affect
the stability of the box?
The server that squirts these messages just crashed, for no apparent
reason, so that's why I'm wondering. It's a UML box. Also, I'm
wondering, are there any howto's for tweaking /proc settings so that the
machine becomes more stable? Are there any settings for increasing the
verbosity of the kernel log so that the reason for a server crashing is
easier to find?
Thanks in advance, and please CC me any replies :)
Regards,
Morten
Yeah you can increase /proc/sys/vm/min_free_kbytes to help the problem.
There is a possibly better solution in the -mm kernels which should get
merged into 2.6 sooner or later - but there is still no way to guarantee
safety from allocation failures. If they cause crashes then that is a
bug, so report them here with traces and a description of the workload
and system hardware, etc.
Thanks
Nick
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