Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-01

[Magnus Naeslund(t)]

Ingo Molnar wrote:
> i've uploaded my current tree (-V0.7.41-01) to:
>
>   http://redhat.com/~mingo/realtime-preempt/
>
> it includes the latest round of RCU fixes - but doesnt solve the SMP
> bootup crash.
>
> 	Ingo

With this kernel I can run for some 20 minutes, then the ip_dst_cache 
overflows.
I gather it has something to do with RCU...

If I just let it run and grep ip_dst_cache /proc/slab it goes up to 4096 
(max) and then the printk's are starting, and the networks stops.
After i up the limit to the double (echo "8192" > 
/proc/sys/net/ipv4/route/max_size) network starts to work again.
But of course, after a while it overflows again:

# grep ip_dst_cache /proc/slabinfo
ip_dst_cache        8192   8205    256   15    1 : tunables   16    8 
 0 : slabdata    547    547      0

I haven't tried the vanilla 2.6.12-rc2 kernel, and I don't have the time 
to do that right now, but i figured it would have something to do with 
your patch. Older 2.6.8 works just fine.

Regards,
Magnus
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