Re: [Qemu-devel] [PATCH] migration: not send zero page header in ram bulk stage

[Li, Liang Z]

> On 2016/1/15 18:24, Li, Liang Z wrote:
> >> It seems that this patch is incorrect, if the no-zero pages are
> >> zeroed again during !ram_bulk_stage, we didn't send the new zeroed
> >> page, there will be an error.
> >>
> >
> > If not in ram_bulk_stage, still send the header, could you explain why it's
> wrong?
> >
> > Liang
> >
> 
> I have made a mistake, and yes, this patch can speed up the live migration
> time, especially when there are many zero pages, it will be more obvious.
> I like this idea. Did you test it with postcopy ? Does it break postcopy ?
> 

Not yet, I saw Dave's comment's, it will beak post copy, it's not hard to fix 
this. 
A more important thing is Paolo's comments, I don't know in which case this 
patch will break LM. Do you have any idea about this? 
Hope that QEMU don't write data to the block 'pc.ram'.

Liang

> Thanks,
> zhanghailiang
>