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From: James Mansion <james@mansionfamily.plus.com>
To: Greg Smith <gsmith@gregsmith.com>
Cc: Scott Carey <scott@richrelevance.com>
Cc: Mark Wong <markwkm@gmail.com>
Cc: pgsql-performance@postgresql.org, Gabrielle Roth <gorthx@gmail.com>
Cc: Selena Deckelmann <selenamarie@gmail.com>
Subject: Re: Effects of setting linux block device readahead size
Date: Thu, 11 Sep 2008 06:21:17 +0100
Message-ID: <48C8AACD.5090702@mansionfamily.plus.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0809101313070.4714@westnet.com>
References: <70c01d1d0809092353r4ae687a3ycf3d99d43a5680cf@mail.gmail.com>
	<Pine.GSO.4.64.0809101023520.15181@westnet.com>
	<a1ec7d000809100926w28a4a57dy7c13f2942edc57ff@mail.gmail.com>
	<Pine.GSO.4.64.0809101313070.4714@westnet.com>

Greg Smith wrote:
> Average seek time:      4ms
> Seeks/second:        250
> Data read/seek:        1MB    (read-ahead number goes here)
> Total read bandwidth:    250MB/s
>
Most spinning disks now are nearer to 100MB/s streaming.  You've talked 
yourself into twice that, random access!

James

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