Messages in this thread | | | Date | Mon, 17 Oct 2005 18:06:55 +0530 | From | Dipankar Sarma <> | Subject | Re: [RCU problem] was VFS: file-max limit 50044 reached |
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On Mon, Oct 17, 2005 at 02:10:09PM +0200, Eric Dumazet wrote: > Dipankar Sarma a écrit : > >On Mon, Oct 17, 2005 at 11:10:04AM +0200, Eric Dumazet wrote: > > > >Agreed. It is not designed to work that way, so there must be > >a bug somewhere and I am trying to track it down. It could very well > >be that at maxbatch=10 we are just queueing at a rate far too high > >compared to processing. > > > > I can freeze my test machine with a program that 'only' use dentries, no > files. > > No message, no panic, but machine becomes totally unresponsive after few > seconds. > > Just greping for call_rcu in kernel sources gave me another call_rcu() use > from syscalls. And yes 2.6.13 has the same problem.
Can you try it with rcupdate.maxbatch set to 10000 in boot command line ?
FWIW, the open/close test problem goes away if I set maxbatch to 10000. I had introduced this limit some time ago to curtail the effect long running softirq handlers have on scheduling latencies, which now conflicts with OOM avoidance requirements.
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