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Re: [Qemu-devel] [PATCH 0/3] COW: Speed up writes
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 0/3] COW: Speed up writes |
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Date: |
Wed, 06 Nov 2013 13:45:59 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 06/11/2013 13:23, Charlie Shepherd ha scritto:
> Patch 2 was written initially I was intending to use cow_co_is_allocated in
> Patch 3 and needed it to consider all sectors but in the end cow_find_streak
> was sufficient, so it may not strictly be necessary.
Patch 2 can still speed up reads that cross a sector boundary from 4 I/O
operations (2 for the bitmap, 2 for the data) to 3 (only 1 for the data).
Paolo