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Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign |
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Date: |
Mon, 01 Jun 2015 13:26:28 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 01/06/2015 13:16, Dmitry Monakhov wrote:
> 259,0 31 385 0.719283423 10729 Q WS 29376775 + 248 [qemu-io]
> 259,0 31 388 0.719287600 10729 Q WS 29377023 + 8 [qemu-io]
> 259,0 31 391 0.719315193 10729 Q WS 29377031 + 248 [qemu-io]
> 259,0 31 394 0.719319179 10729 Q WS 29377279 + 8 [qemu-io]
Compared to the old one:
> 9,0 11 1 0.000000000 11151 Q WS 312737792 + 1023 [qemu-img]
> 9,0 11 2 0.000007938 11151 Q WS 312738815 + 8 [qemu-img]
> 9,0 11 3 0.000030735 11151 Q WS 312738823 + 1016 [qemu-img]
> 9,0 11 4 0.000032482 11151 Q WS 312739839 + 8 [qemu-img]
> 9,0 11 5 0.000041379 11151 Q WS 312739847 + 1016 [qemu-img]
> 9,0 11 6 0.000042818 11151 Q WS 312740863 + 8 [qemu-img]
> 9,0 11 7 0.000051236 11151 Q WS 312740871 + 1017 [qemu-img]
I suspect the difference is that my patch avoids RMW operations on disks
that have 512-byte logical blocks and 4K physical blocks.
Paolo