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Re: Effects of setting linux block device readahead size

From: James Mansion <james(at)mansionfamily(dot)plus(dot)com>
To: Greg Smith <gsmith(at)gregsmith(dot)com>
Cc: Scott Carey <scott(at)richrelevance(dot)com>, Mark Wong <markwkm(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org, Gabrielle Roth <gorthx(at)gmail(dot)com>, Selena Deckelmann <selenamarie(at)gmail(dot)com>
Subject: Re: Effects of setting linux block device readahead size
Date: 2008-09-11 05:21:17
Message-ID: 48C8AACD.5090702@mansionfamily.plus.com (view raw or flat)
Thread:
Lists: pgsql-performance
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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