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Re: [Qemu-block] [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmap

From: John Snow
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmaps loading and migration logic
Date: Thu, 2 Aug 2018 15:10:36 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 08/02/2018 03:05 PM, Denis V. Lunev wrote:
> On 08/02/2018 12:50 PM, Dr. David Alan Gilbert wrote:
>> * Denis V. Lunev (address@hidden) wrote:
>>>> I don't quite understand the last two paragraphs.
>>> we are thinking right now to eliminate delay on regular IO
>>> for migration. There is some thoughts and internal work in
>>> progress. That is why I am worrying.
>> What downtime are you typicaly seeing and what are you aiming for?
>> It would be good if you could explain what you're planning to
>> fix there so we can get a feel for it nearer the start of it
>> rather than at the end of the reviewing!
>> Dave
> The ultimate goal is to reliable reach 100 ms with ongoing IO and
> you are perfectly correct about reviewing :)
> Though the problem is that right now we are just trying to
> invent something suitable :(
> Den

Yeah, I gotcha -- please give me just a little time. I'm not against
using Vlad's series, it just surprised me. David and I have talked about
what you're trying to do and we are in agreement that it is the right
thing to do for now.

I have some more questions about Vlad's series, but I want to test it a
bit myself before I waste time asking them. I'll stage a working version
as soon as I can.


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