Cached file read performance with 6.2-PRERELEASE
olli at lurza.secnetix.de
Thu Dec 21 06:08:50 PST 2006
Mark Kirkwood wrote:
> Exactly, that's why I did the comparison - I think you missed the part
> where I mentioned the 2 systems were *identical* with respect to cpus,
> memory, mobo - in fact even the power supplies are identical too!
So I assume your benchmark measured the performance of the
zero and null devices under FreeBSD and Linux.
This is a quote from the "cstream" docs: "These special
devices speed varies greatly among operating systems,
redirecting from it isn't appropriate benchmarking and
a waste of resources anyway."
I suggest you try cstream (ports/misc/cstream) instead of
dd. It supports built-in zero creation and data sink, so
you don't have to use the zero and null devices at all,
eliminating their overhead. It would be interesting how
that will change your benchmark numbers.
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd
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