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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:1.9.1.7) 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.
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
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
- [Qemu-devel] KVM call agenda for Feb 9, Chris Wright, 2010/02/08
- [Qemu-devel] Re: KVM call agenda for Feb 9,
Avi Kivity <=
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Alexander Graf, 2010/02/09
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Jan Kiszka, 2010/02/09
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Anthony Liguori, 2010/02/09
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Avi Kivity, 2010/02/09
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Anthony Liguori, 2010/02/09
- Re: [Qemu-devel] Re: KVM call agenda for Feb 9, Avi Kivity, 2010/02/09
[Qemu-devel] Re: KVM call agenda for Feb 9, Anthony Liguori, 2010/02/09
[Qemu-devel] Re: KVM call agenda for Feb 9, Avi Kivity, 2010/02/09