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Re: [Qemu-devel] [RFC] find_next_bit optimizations
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [RFC] find_next_bit optimizations |
Date: |
Tue, 12 Mar 2013 16:12:18 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Mar 12, 2013 at 09:41:04AM +0100, Peter Lieven wrote:
>
> Am 12.03.2013 um 09:35 schrieb Stefan Hajnoczi <address@hidden>:
>
> > On Mon, Mar 11, 2013 at 02:44:03PM +0100, Peter Lieven wrote:
> >> I ever since had a few VMs which are very hard to migrate because of a lot
> >> of memory I/O. I found that finding the next dirty bit
> >> seemed to be one of the culprits (apart from removing locking which Paolo
> >> is working on).
> >>
> >> I have to following proposal which seems to help a lot in my case. Just
> >> wanted to have some feedback.
> >
> > Hi Peter,
> > Do you have any performance numbers for this patch? I'm just curious
> > how big the win is.
>
> Hi Stefan,
>
> please see my recent email to the list with the final patch.
> The win is up to 100%. Worst case execution time (whole
> array is zero) is halved on x86_64.
Thanks!
Stefan
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, (continued)
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, Peter Maydell, 2013/03/11
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, Peter Maydell, 2013/03/11
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, Peter Lieven, 2013/03/11
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, Paolo Bonzini, 2013/03/11
- Re: [Qemu-devel] [RFC] find_next_bit optimizations, Peter Lieven, 2013/03/11
Re: [Qemu-devel] [RFC] find_next_bit optimizations, Stefan Hajnoczi, 2013/03/12