Re: KVM lock contention on 48 core AMD machine

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21.03.2011 20:12, Eric Dumazet wrote:
> Le lundi 21 mars 2011 Ã 19:02 +0200, Avi Kivity a Ãcrit :
> 
>> Any ideas on how to fix it?  We could pre-allocate IDs and batch them in 
>> per-cpu caches, but it seems like a lot of work.
>>
> 
> Hmm, I dont know what syscalls kvm do, but even a timer_gettime() has to
> lock this idr_lock.

I wonder why my testcase - 160 kvm guests on a 2-core AMD AthlonII CPU -
shows no contention of that sort, not at all...  Yes sure, all these
(linux) guests are idling at login: prompt, but I'd expect at least
some gettimeofday() and some load average, -- everything stays close
to zero.

/mjt
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