System crashing when swap hits 25%

Simon Slater pyevet at aapt.net.au
Mon Mar 10 23:34:49 UTC 2008


On Mon, 2008-03-10 at 18:51 -0400, Chris Snook wrote:
> I suggest setting vm.overcommit_memory=2 with sysctl to turn on
> explicit 
> overcommit control, and then try changing the value of 
> vm.overcommit_ratio to see if that changes where your system dies.
> 
I've never come across these variables/commands before, so I'll go
slowly here. 

> Also, is the system actually crashing, or does it just get swaplocked 
> and hang indefinitely when swap usage reaches 25%?  See if you can
> get 
> sysrq-m and sysrq-t data out of the system.  You'll want to set 
> kernel.sysrq=1 first. 
Where do I find these?

-- 
Regards
Simon




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