From owner-freebsd-java@FreeBSD.ORG  Fri Nov 10 22:34:35 2006
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Date: Sat, 11 Nov 2006 00:32:36 +0200
From: Nikos Ntarmos <ntarmos@ceid.upatras.gr>
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Subject: Re: Performance of Java on FBSD vs. others...
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Hi Matthew.

On Fri, Nov 10, 2006 at 09:53:10PM +0000, Matthew Seaman wrote:
> Is this the same issue with syscalls as affects MySQL?  As in
> unconstrained calling of gettimeofday() or similar because such 
> "syscalls are free"?  Which is pretty much true in Linux, at the
> cost of not returning the time particularly accurately.
> 
> Look at http://wikitest.freebsd.org/MySQL -- especially the point
> about "frequent queries of the system time".   Try tweaking the
> 'kern.timecounter.choice' sysctl and see if that makes much
> difference.

That was my first thought too. I've tried with ACPI-fast, TSC, and i8254
and saw no noticeable difference (btw k.t.hardware is the one to be set
to whatever value and k.t.choice the one to be queried for available
time counters)...

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