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 CAGTBQpaoMLASfgTn-fufwou5-Lu6AybsGfi9a7JHeZZaeL+u6g@mail.gmail.com
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Ответ на Re: Two identical systems, radically different performance  (Craig James <cjames@emolecules.com>)
Ответы Re: Two identical systems, radically different performance  (Craig James <cjames@emolecules.com>)
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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?

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