Date: Mon, 19 Jan 2004 20:38:45 -0800
From: Andrew Morton <akpm@osdl.org>
To: markw@osdl.org
Cc: piggin@cyberone.com.au, linux-kernel@vger.kernel.org
Subject: Re: DBT-2 anticipatory scheduler and filesystem results with 2.6.1
Message-Id: <20040119203845.332cd5df.akpm@osdl.org>
In-Reply-To: <200401200005.i0K05do05666@mail.osdl.org>
References: <200401200005.i0K05do05666@mail.osdl.org>
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markw@osdl.org wrote:
>
>  I ran some dbt-2 tests against 5 filesystems with 2.6.1-mm4 and 2.6.1. I
>  see a degradation from 0 to 7% in throughput. 

-mm4 also had readahead changes which will adversely impact database-style
workloads.  I'd suggest that you revert

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.1/2.6.1-mm4/broken-out/readahead-revert-lazy-readahead.patch

and retest.

We reverted lazy readahead because it broke NFS linear reads and was doing
the wrong thing anyway.  We need to come up with something else for
database-style workloads.

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