Re: SW-RAID0 Performance problems

From: Andreas Peter (ujq7@rz.uni-karlsruhe.de)
Date: Sat Apr 14 2001 - 08:09:37 EST

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Am Samstag, 14. April 2001 14:28 schrieb Kurt Roeckx:
> Does turning unmaskirq on help?

Already tried this, but it doesn't help
The actual settings (same on /dev/hdc):

bash-2.04# hdparm /dev/hda

/dev/hda:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 59556/16/63, sectors = 60032448, start = 0

bash-2.04# hdparm -tT /dev/md0

/dev/md0:
Timing buffer-cache reads: 128 MB in 1.30 seconds = 98.46 MB/sec
Timing buffered disk reads: 64 MB in 3.14 seconds = 20.38 MB/sec

bash-2.04# hdparm -tT /dev/hda3

/dev/hda3:
Timing buffer-cache reads: 128 MB in 1.31 seconds = 97.71 MB/sec
Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec

Andreas

-- Andreas Peter *** ujq7@rz.uni-karlsruhe.de

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