Hello Rafal,
Hello,
However I find it quite possible to have reached the throughput limit
because of software (driver) problems. I have done various testing
(mostly "hdparm -tT" with exactly the same PC and disks since about
kernel 2.6.8 (maybe even earlier). I remember with certainty that read
throughput the early days was about 50MB/s for each of the big disks,
and combined with RAID 0 I got ~75MB/s. Those figures have been dropping
gradually with each new kernel release and the situation today, with
2.6.22, is that hdparm gives maximum throughput 20MB/s for each disk,
and for RAID 0 too!
Just tested (plain curiosity).
via82cxxx average result @533MHz:
/dev/hda:
Timing cached reads: 232 MB in 2.00 seconds = 115.93 MB/sec
Timing buffered disk reads: 64 MB in 3.12 seconds = 20.54 MB/sec
pata_via average result @533MHz:
/dev/sda:
Timing cached reads: 234 MB in 2.01 seconds = 116.27 MB/sec
Timing buffered disk reads: 82 MB in 3.05 seconds = 26.92 MB/sec
Same 2.6.23-rc1-git11 kernel.
Yes - constant 6MB/s difference (31%). Cool.
Dimitris
Regards
Rafał
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