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Re: [Qemu-devel] [RFC] qcow2 journalling draft
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From: |
Benoît Canet |
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Subject: |
Re: [Qemu-devel] [RFC] qcow2 journalling draft |
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Date: |
Thu, 5 Sep 2013 14:08:00 +0200 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
> Then you get very quickly alternating sequences of "L2 depends on
> refcount update" (for allocation) and "refcount update depends on L2
> update" (for freeing), which means that Qcow2Cache starts flushing all
> the time without accumulating many requests. These are cases that would
> benefit as well from the atomicity of journal transactions.
True, Deduplication can hit this case on delete if I remember correctly
and it slow down everything.
Best regards
Benoît
Re: [Qemu-devel] [RFC] qcow2 journalling draft, Max Reitz, 2013/09/04
Re: [Qemu-devel] [RFC] qcow2 journalling draft, Stefan Hajnoczi, 2013/09/05
Re: [Qemu-devel] [RFC] qcow2 journalling draft, Fam Zheng, 2013/09/06