Messages in this thread |  | | From | Torrey Hoffman <> | Subject | RE: [reiserfs-list] ReiserFS on RAID5 Linux-2.4 - speed problem | Date | Thu, 29 Nov 2001 15:36:48 -0800 |
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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. :-(
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