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Re: Two identical systems, radically different performance - Mailing list pgsql-performance

From Craig James
Subject Re: Two identical systems, radically different performance
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Msg-id CAFwQ8rfVgRXQLaHULbvpD65+7jYsAt9ANqujOwnksFLGYHkZew@mail.gmail.com
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In response to Re: Two identical systems, radically different performance  (Claudio Freire <klaussfreire@gmail.com>)
Responses Re: Two identical systems, radically different performance  (Claudio Freire <klaussfreire@gmail.com>)
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On Mon, Oct 8, 2012 at 3:09 PM, Claudio Freire <klaussfreire@gmail.com> wrote:
On Mon, Oct 8, 2012 at 7:06 PM, Craig James <cjames@emolecules.com> wrote:
>> Sequential Input on the new one is 279MB/s, on the old 400MB/s.
>>
>
> But why? What have I overlooked?

Do you have readahead properly set up on the new one?

 # blockdev --getra /dev/sdb1
256

Same on both servers.

Thanks,
Craig

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