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    SubjectRe: Time for a pre-patch-2.0.31-3?
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    Richard Waltham <dormouse@farsrobt.demon.co.uk> writes:

    > Hi,
    >
    > Have you checked what happens to disk read performance?
    >
    > With 2.0.29, and 2.0.30 with Pavel Krauz patch, Bonnie gives something like
    >
    > -------Sequential Output-------- ---Sequential Input-- --Random--
    > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    > 100 2259 77.0 4873 28.5 1768 20.5 2119 76.9 4114 20.4 118.8 5.3
    >
    >
    > And with your latest patch with pre-patch 2.0.31-2
    >
    > -------Sequential Output-------- ---Sequential Input-- --Random--
    > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    > 100 2262 76.8 4841 30.6 1362 15.5 1445 52.7 1568 7.6 120.1 5.3
    >
    > Note the drastic fall in read performance. :( These results are consistent.

    I rememember the original port of the 2.1 buffer.c into 2.0.30 was inspired
    by this read performance problem. Leonard Zubkoff presented a patch for it
    at this time. Maybe he knows how to fix it. It *should* be fixed for 2.0.31.

    -Andi


    >
    >
    > Richard
    >
    >
    >
    > Dr. Werner Fink wrote:
    > >
    > >
    > > Hi,
    > >
    > > here is the collected patch against pre-patch-2.0.31-2. The buffer code
    > > is based on the NEW buffer-code of 2.0.30. I've added some old own and old
    > > foreign changes (let's look into http://www.linuxhq.com/patch/20-p0595.html):
    > >
    >
    >
    > --
    > Richard Waltham | Work: richard@digtalinterface.demon.co.uk
    > At home in | Home: dormouse@farsrobt.demon.co.uk
    > Southampton UK | Compuserve 100421.1276

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