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Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migrati
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread |
Date: |
Mon, 19 Mar 2018 12:11:47 +0000 |
User-agent: |
Mutt/1.9.2 (2017-12-15) |
* Xiao Guangrong (address@hidden) wrote:
>
> Hi David,
>
> Thanks for your review.
>
> On 03/15/2018 06:25 PM, Dr. David Alan Gilbert wrote:
>
> > > migration/ram.c | 32 ++++++++++++++++----------------
> >
> > Hi,
> > Do you have some performance numbers to show this helps? Were those
> > taken on a normal system or were they taken with one of the compression
> > accelerators (which I think the compression migration was designed for)?
>
> Yes, i have tested it on my desktop, i7-4790 + 16G, by locally live migrate
> the VM which has 8 vCPUs + 6G memory and the max-bandwidth is limited to 350.
>
> During the migration, a workload which has 8 threads repeatedly written total
> 6G memory in the VM. Before this patchset, its bandwidth is ~25 mbps, after
> applying, the bandwidth is ~50 mbps.
OK, that's good - worth adding those notes to your cover letter.
I wonder how well it works with compression acceleration hardware; I
can't see anything in this series making it worse.
> BTW, Compression will use almost all valid bandwidth after all of our work
> which i will post it out part by part.
Oh, that will be very nice.
Dave
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH 0/8] migration: improve and cleanup compression, guangrong . xiao, 2018/03/13
- [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, guangrong . xiao, 2018/03/13
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Dr. David Alan Gilbert, 2018/03/15
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Xiao Guangrong, 2018/03/16
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Peter Xu, 2018/03/21
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Xiao Guangrong, 2018/03/22
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Peter Xu, 2018/03/26
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Xiao Guangrong, 2018/03/26
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Peter Xu, 2018/03/27
- Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Dr. David Alan Gilbert, 2018/03/27
Re: [Qemu-devel] [PATCH 1/8] migration: stop compressing page in migration thread, Wang, Wei W, 2018/03/27