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

From: Avi Kivity
Subject: [Qemu-devel] Re: KVM call agenda for Feb 9
Date: Tue, 09 Feb 2010 08:56:20 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1

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.

- 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

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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