Re: [RCU problem] was VFS: file-max limit 50044 reached

[Dipankar Sarma <dipankar@in.ibm.com>]

On Mon, Oct 17, 2005 at 03:28:22PM +0200, Eric Dumazet wrote:
> Dipankar Sarma a écrit :
> >On Mon, Oct 17, 2005 at 02:10:09PM +0200, Eric Dumazet wrote:
> >
> >
> >Can you try it with rcupdate.maxbatch set to 10000 in boot
> >command line ?
> >
> 
> Changing maxbatch from 10 to 10000 cures the problem.
> Maybe we could initialize maxbatch to (10000000/HZ), considering no current 
> cpu is able to queue more than 10.000.000 items per second in a list.

I don't know, maybe I can look at a more adaptive heuristics.

> 
> 
> >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.
> 
> Yes, and probably OOM avoidance has a higher priority than latencies in DOS 
> situations...

Yes, one would think. But the audio guys would chew my head for this :)

Thanks
Dipankar