[Qemu-devel] Re: KVM call agenda for Feb 9

[Avi Kivity]

On 02/09/2010 08:56 AM, Avi Kivity wrote:
> On 02/09/2010 03:28 AM, Chris Wright wrote:
> > Please send in any agenda items you are interested in covering.
>
> hpet overhead on large smp guests
>
> I measured hpet consuming about a half a core's worth of cpu on an 
> idle Windows 2008 R2 64-way guest.  This is mostly due to futex 
> contention, likely from the qemu mutex.
>
> Options:
> - ignore, this is about 1% of the entire system (but overhead might 
> increase greatly if a workload triggers more hpet accesses)
> - push hpet into kernel, with virtio-net, virtio-blk, and kernel-hpet, 
> there's little reason to exit into qemu
> - rcuify/fine-grain qemu locks
- implement hyper-v timers


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