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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling |
Date: | Wed, 17 Feb 2010 11:47:20 +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 02/17/2010 11:42 AM, OHMURA Kei wrote:
"We think"? I mean - yes, I think so too. But have you actually measured it?How much improvement are we talking here? Is it still faster when a bswap is involved?Thanks for pointing out. I will post the data for x86 later. However, I don't have a test environment to check the impact of bswap.Would you please measure the run time between the following section if possible?It'd make more sense to have a real stand alone test program, no?I can try to write one today, but I have some really nasty important bugs to fix first.OK. I will prepare a test code with sample data. Since I found a ppc machine around, I will run the code and post the results ofx86 and ppc.
I've applied the patch - I think the x86 results justify it, and I'll be very surprised if ppc doesn't show a similar gain. Skipping 7 memory accesses and 7 tests must be a win.
-- error compiling committee.c: too many arguments to function
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