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Re: Introducing a new linux readahead framework

From: Michael Stone <mstone+postgres(at)mathom(dot)us>
To: pgsql-performance(at)postgresql(dot)org
Cc: Wu Fengguang <wfg(at)mail(dot)ustc(dot)edu(dot)cn>
Subject: Re: Introducing a new linux readahead framework
Date: 2006-04-26 14:43:49
Message-ID: 20060426144347.GA31328@mathom.us (view raw or flat)
Thread:
Lists: pgsql-performance
From my initial testing this is very promising for a postgres server. 
Benchmark-wise, a simple dd with an 8k blocksize gets ~200MB/s as 
compared to ~140MB/s on the same hardware without the patch. Also, that 
200MB/s seems to be unaffected by the dd blocksize, whereas without the 
patch a 512k blocksize would get ~100MB/s. I'm now watching to see how 
it does over a couple of days on real-world workloads. 

Mike Stone

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