Re: System hang problem.

On Tue, 2006-10-03 at 15:23 -0700, Manish Neema wrote:

> Any suggestions on how we can prevent system-hang + not have automount
> (and any other root process) die? 

Perhaps this is a silly suggestion, but why wouldn't you just add more
memory/swap to keep the system from needing to invoke the OOM killer?
The system will not OOM kill a process until it's completely out of all
pages in a given zone.  It sounds like you don't have enough memory, if
you were relying on the OOM killer to keep your system running on U3
then you still had a problem, a normally running system should not
trigger the OOM killer.

If the memory usage is load driven (for example a dynamic web server
that sees large bursts of traffic) then you need to control the memory
allocation of the system by using the throttling features built into
these systems to limit concurrent connections to a reasonably
serviceable amount.

Is the system really running out of memory, or is it zone starvation?
I've seen cases on large memory systems (systems with 8GB+ of RAM),
where the OOM killer kicks in when low memory is starved even if large
amounts of memory are still available. 

I would suggest describing a little more about your system (hardware,
RAM, swap) and application environment if you want more constructive
suggestions.

Later,
Tom



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