Re: Two identical systems, radically different performance

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От Claudio Freire
Тема Re: Two identical systems, radically different performance
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Msg-id CAGTBQpbFSWPR1Z9NiN_B6amhONjyt9PvoT13Z=SdPN8GoKZi2Q@mail.gmail.com
обсуждение исходный текст
Ответ на Re: Two identical systems, radically different performance  (Craig James <cjames@emolecules.com>)
Ответы Re: Two identical systems, radically different performance  (Evgeny Shishkin <itparanoia@gmail.com>)
Re: Two identical systems, radically different performance  (Craig James <cjames@emolecules.com>)
Список pgsql-performance
Дерево обсуждения 
On Mon, Oct 8, 2012 at 7:25 PM, Craig James <cjames@emolecules.com> wrote:
>> > But why? What have I overlooked?
>>
>> Do you have readahead properly set up on the new one?
>
>
>  # blockdev --getra /dev/sdb1
> 256


It's probably this. 256 is way too low to saturate your I/O system.
Pump it up. I've found 8192 works nice for a system I have, 32000 I
guess could work too.

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