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Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimiz
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization |
Date: |
Fri, 4 Mar 2016 18:51:21 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Paolo Bonzini (address@hidden) wrote:
>
>
> On 04/03/2016 15:26, Li, Liang Z wrote:
> >> >
> >> > The memory usage will keep increasing due to ever growing caches, etc, so
> >> > you'll be left with very little free memory fairly soon.
> >> >
> > I don't think so.
> >
>
> Roman is right. For example, here I am looking at a 64 GB (physical)
> machine which was booted about 30 minutes ago, and which is running
> disk-heavy workloads (installing VMs).
>
> Since I have started writing this email (2 minutes?), the amount of free
> memory has already gone down from 37 GB to 33 GB. I expect that by the
> time I have finished running the workload, in two hours, it will not
> have any free memory.
But what about a VM sitting idle, or that just has more RAM assigned to it
than is currently using.
I've got a host here that's been up for 46 days and has been doing some
heavy VM debugging a few days ago, but today:
# free -m
total used free shared buff/cache available
Mem: 96536 1146 44834 184 50555 94735
I very rarely use all it's RAM, so it's got a big chunk of free RAM, and yes
it's got a big chunk of cache as well.
Dave
>
> Paolo
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, (continued)
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Michael S. Tsirkin, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Michael S. Tsirkin, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/10
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Rik van Riel, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/10
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Paolo Bonzini, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Li, Liang Z, 2016/03/07
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Li, Liang Z, 2016/03/09
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Li, Liang Z, 2016/03/09
Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Li, Liang Z, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Roman Kagan, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Dr. David Alan Gilbert, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Li, Liang Z, 2016/03/04
- Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization, Michael S. Tsirkin, 2016/03/04