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Re: [Qemu-devel] About QEMU BQL and dirty log switch in Migration
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] About QEMU BQL and dirty log switch in Migration |
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Date: |
Wed, 26 Apr 2017 17:46:56 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 24/04/2017 18:42, Dr. David Alan Gilbert wrote:
> I suppose there's a few questions;
> a) Do we actually need the BQL - and if so why
> b) What actually takes 13s? It's probably worth figuring
> out where it goes, the whole bitmap is only 1GB isn't it
> even on a 4TB machine, and even the simplest way to fill
> that takes way less than 13s.
It's more likely that it is the migration_bitmap_sync immediately after
that.
I think it is possible to move migration_bitmap_sync outside BQL. It
should be simpler to evaluate that after Juan's cleanups go in.
Paolo