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Re: [PATCH v2 1/4] migration/calc-dirty-rate: replaced CRC32 with xxHash
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From: |
Juan Quintela |
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Subject: |
Re: [PATCH v2 1/4] migration/calc-dirty-rate: replaced CRC32 with xxHash |
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Date: |
Wed, 10 May 2023 18:54:58 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Andrei Gudkov <gudkov.andrei@huawei.com> wrote:
> This significantly reduces overhead of dirty page
> rate calculation in sampling mode.
> Tested using 32GiB VM on E5-2690 CPU.
>
> With CRC32:
> total_pages=8388608 sampled_pages=16384 millis=71
>
> With xxHash:
> total_pages=8388608 sampled_pages=16384 millis=14
>
> Signed-off-by: Andrei Gudkov <gudkov.andrei@huawei.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
This changes nothing outside of dirtyrate, and if the hash function is
faster, we should be good.
queued.
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