Re: Two identical systems, radically different performance

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От Craig James
Тема Re: Two identical systems, radically different performance
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Msg-id CAFwQ8reOc-ntKsLRSqVOf81FsGRA_OiVbusDduB2BuH_SzdNGQ@mail.gmail.com
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Ответ на Re: Two identical systems, radically different performance  (Claudio Freire <klaussfreire@gmail.com>)
Ответы Re: Two identical systems, radically different performance  (Claudio Freire <klaussfreire@gmail.com>)
Re: Two identical systems, radically different performance  (Tomas Vondra <tv@fuzzy.cz>)
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On Mon, Oct 8, 2012 at 3:50 PM, Claudio Freire <klaussfreire@gmail.com> wrote:
On Mon, Oct 8, 2012 at 7:48 PM, Craig James <cjames@emolecules.com> wrote:
>> >  # 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.
>
>
> But again ... the two systems are identical.  This can't explain it.

Is the read-ahead the same in both systems?

Yes, as I said in the original reply (it got cut off from your reply): "Same on both servers."

Craig

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