Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling

[Avi Kivity <avi@redhat.com>]

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 of
> x86 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.


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