File I/O benchmarks for various kernel

File I/O benchmarks for various kernel

[Daniel Phillips]

I've been using dbench a lot lately for reality checks on various kernel
mods, and out of interest I decided to run benchmarks with it on a few
different kernel versions.  I noticed a major difference between 2.2 and
2.4 kernels - 2.4 is running the benchmarks about 3 times faster than
2.2, and it seems to be getting faster with each step towards 2.4.0.  On
the other hand, 2.2 seems to be getting slower.  Here are a few points
on the curve.

  Test machine: 64 meg, 500 Mhz K6, IDE, Ext2, Blocksize=4K
  Test: dbench 48

  Kernel                 Throughput      Elapsed Time
  ------                 ----------      ------------
  2.2.16                 3.1 MB/sec      33 min 53 secs
  2.2.18                 2.8 MB/sec      38 min 10 secs
  2.2.19-pre3            2.7 MB/sec      39 min 44 secs
  2.4.0-test12           7.3 MB/sec      14 min 32 secs
  2.4.0-test13-pre4      9.5 MB/sec      11 min 06 secs
  2.4.0-test13-pre5     10.8 MB/sec       9 min 48 secs

Dbench was written by Andrew Tridgell to measure disk performance under
simulated samba network traffic load.  The '48' means it's simulating
the file access patterns of 48 network clients, all doing heavy io at
the same time.

For anyone interested in checking these results on their own hardware,
dbench is available at:

  ftp://samba.org/pub/tridge/dbench/dbench-1.1.tar.gz

--
Daniel
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Re: File I/O benchmarks for various kernel

[Ed Tomlinson]

Hi,

Some more numbers to consider:

7.3 MB/s  54.7s user  159.6s system  25% cpu  elaspsed 14:21.9m 
        reiserfs on hda whick gets 16.1 MB/s from hdparm -t

9.7 MB/s  51.6s user   78.3s system  19% cpu  elaspsed 10:50.8m
        ext2 on hdb which gets 10.6 MB/s from hdparm -t

both drives are udma33.  The sytem is a K6-III 400 with 128m running:
        2.4.0test13pre6 + reil #2 + drm fix + reiserfs 3.6.23

Think ext2 is doing pretty good.  I have seen comments that imply dbench 
does not show reiserfs at its best - they favor the bonnie suite.

Luck
Ed Tomlinson

Daniel Phillips wrote:

> I've been using dbench a lot lately for reality checks on various kernel
> mods, and out of interest I decided to run benchmarks with it on a few
> different kernel versions.  I noticed a major difference between 2.2 and
> 2.4 kernels - 2.4 is running the benchmarks about 3 times faster than
> 2.2, and it seems to be getting faster with each step towards 2.4.0.  On
> the other hand, 2.2 seems to be getting slower.  Here are a few points
> on the curve.
> 
>   Test machine: 64 meg, 500 Mhz K6, IDE, Ext2, Blocksize=4K
>   Test: dbench 48
> 
>   Kernel                 Throughput      Elapsed Time
>   ------                 ----------      ------------
>   2.2.16                 3.1 MB/sec      33 min 53 secs
>   2.2.18                 2.8 MB/sec      38 min 10 secs
>   2.2.19-pre3            2.7 MB/sec      39 min 44 secs
>   2.4.0-test12           7.3 MB/sec      14 min 32 secs
>   2.4.0-test13-pre4      9.5 MB/sec      11 min 06 secs
>   2.4.0-test13-pre5     10.8 MB/sec       9 min 48 secs
> 
> Dbench was written by Andrew Tridgell to measure disk performance under
> simulated samba network traffic load.  The '48' means it's simulating
> the file access patterns of 48 network clients, all doing heavy io at
> the same time.
> 
> For anyone interested in checking these results on their own hardware,
> dbench is available at:
> 
>   ftp://samba.org/pub/tridge/dbench/dbench-1.1.tar.gz
> 
> --
> Daniel
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/


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