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SubjectRE: [reiserfs-list] ReiserFS on RAID5 Linux-2.4 - speed problem
Date
René Rebe wrote:
> Have you tryed:
>
> echo 1023 > /proc/sys/vm/max-readahead
[...]

Well, I gave that a try.

note:
/dev/md0 is a 180 GB reiserfs on software RAID 5.
/dev/hda9 is an 18 GB reiserfs on a normal partition.
System is a dual PIII-800 with 512 MB RAM.
Kernel is 2.4.16 + Andrew Morton's Low Latency and I/O
scheduling patches.

before:
cat /proc/sys/vm/max-readahead: 31
dbench 32 on /dev/md0 : 8.11 MB/sec
dbench 32 on /dev/hda9 : 24.85 MB/sec

after:
echo 1023 > /proc/sys/vm/max-readahead
dbench 32 on /dev/md0 : 8.047 MB/sec
dbench 32 on /dev/hda9 : 24.65 MB/sec

So that change actually made things a little worse,
at least on this kernel. :-(

Torrey
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