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Re: [Qemu-devel] linux guests and ksm performance
From: |
address@hidden |
Subject: |
Re: [Qemu-devel] linux guests and ksm performance |
Date: |
Thu, 23 Feb 2012 20:08:27 +0100 |
User-agent: |
K-9 Mail for Android |
Stefan Hajnoczi <address@hidden> schrieb:
>On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven <address@hidden> wrote:
>> However, in a virtual machine I have not observed the above slow down
>to
>> that extend
>> while the benefit of zero after free in a virtualisation environment
>is
>> obvious:
>>
>> 1) zero pages can easily be merged by ksm or other technique.
>> 2) zero (dup) pages are a lot faster to transfer in case of
>migration.
>
>The other approach is a memory page "discard" mechanism - which
>obviously requires more code changes than zeroing freed pages.
>
>The advantage is that we don't take the brute-force and CPU intensive
>approach of zeroing pages. It would be like a fine-grained ballooning
>feature.
>
I dont think that it is cpu intense. All user pages are zeroed anyway, but at
allocation time it shouldnt be a big difference in terms of cpu power.
>I hope someone will follow up saying this has already been done or
>prototyped :).
>
>Stefan
--
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- [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/23
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/23
- Re: [Qemu-devel] linux guests and ksm performance, Javier Guerra Giraldez, 2012/02/23
- Re: [Qemu-devel] linux guests and ksm performance,
address@hidden <=
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
- Message not available
- Message not available
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
- Re: [Qemu-devel] linux guests and ksm performance, Avi Kivity, 2012/02/28
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
- Re: [Qemu-devel] linux guests and ksm performance, Avi Kivity, 2012/02/28
Re: [Qemu-devel] linux guests and ksm performance, Gleb Natapov, 2012/02/24