Non-intuitive gains in performance

Bill Davidsen davidsen at
Sat Feb 10 02:58:16 UTC 2001

I'm running some servers with an o/s which has a 2GB file limit. I thought
I would get better performance if I used the cycbuffs sequentially, since
the storage is on a RAID controller with a stripe size too small to work
well. The idea was to at least thrash in one part of the disk:-(

So I set the metacycbuff SEQUENTIAL as advertised, and the artwrite time
didn't go down a bit. However, the hiswrite time dropped by some 40%! Does
anyone have a thought on this? It's nice that I really helped the
performance, but I lack any idea why it works this way.

bill davidsen <davidsen at>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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