Re: Two identical systems, radically different performance

From: Craig James <cjames(at)emolecules(dot)com>
To: Claudio Freire <klaussfreire(at)gmail(dot)com>
Cc: Evgeny Shishkin <itparanoia(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Two identical systems, radically different performance
Date: 2012-10-08 22:25:43
Message-ID: CAFwQ8rfVgRXQLaHULbvpD65+7jYsAt9ANqujOwnksFLGYHkZew@mail.gmail.com
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On Mon, Oct 8, 2012 at 3:09 PM, Claudio Freire <klaussfreire(at)gmail(dot)com>wrote:

> On Mon, Oct 8, 2012 at 7:06 PM, Craig James <cjames(at)emolecules(dot)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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