Linux-kernel mailing list archive 2000-06,: Re: 2.2.15pre5, IDE and Athlon problem(s)

# Re: 2.2.15pre5, IDE and Athlon problem(s)

Mark Hahn (hahn@coffee.psychology.mcmaster.ca)
Sat, 5 Feb 2000 23:39:42 -0500 (EST)

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> > dd if=/dev/zero of=/home/1 bs=1024k &

which is the moral equivalent to a fork-bomb: it generates an overwhelming
stream of requests to the same region of disk.

> It's probably a problem with the elevator sorting in
> ll_rw_blk. I'm thinking this because the exact same
> test doesn't give any performance hit at all on my
> SCSI system...

I think it's merely a fairness issue with allocating request blocks;
elevator sorting should be fine, since it's c-scan. this isn't an issue
for scsi because we punt all scheduling to the disk (not always a win...)

regards, mark hahn.

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