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From: Con Kolivas <conman@kolivas.net>
To: Jens Axboe <axboe@suse.de>, Giuliano Pochini <pochini@shiny.it>
Subject: Re: [BENCHMARK] 2.5.47{-mm1} with contest
Date: Tue, 12 Nov 2002 20:40:05 +1100
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Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@digeo.com>
References: <3DD046BD.799F36D4@digeo.com> <XFMail.20021112095219.pochini@shiny.it> <20021112092045.GB832@suse.de>
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>On Tue, Nov 12 2002, Giuliano Pochini wrote:
>> On 12-Nov-2002 Andrew Morton wrote:
>> > Con Kolivas wrote:
>> >> io_load:
>> >> Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
>> >> 2.4.18 [3]              474.1   15      36      10      6.64
>> >> 2.4.19 [3]              492.6   14      38      10      6.90
>> >> 2.5.46 [1]              600.5   13      48      12      8.41
>> >> 2.5.46-mm1 [5]          134.3   58      6       8       1.88
>> >> 2.5.47 [3]              165.9   46      9       9       2.32
>> >> 2.5.47-mm1 [5]          126.3   61      5       8       1.77
>> >
>> > We've increased the kernel build speed by 3.6x while decreasing the
>> > speed at which writes are retired by 5.3x.
>>
>> Did the elevator change between .46 and .47 ?
>
>No, but the fifo_batch count (which controls how many requests are moved
>sort list to dispatch queue) was halved. This gives lower latency, at
>the possible cost of dimishing throughput.

Preempt also lowered this value, and ReiserFS changes may have affected it 
further (test machine running Reiser).

Con
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