Date: Sat, 11 Nov 2006 00:32:36 +0200 From: Nikos Ntarmos <ntarmos@ceid.upatras.gr> To: freebsd-java@freebsd.org Subject: Re: Performance of Java on FBSD vs. others... Message-ID: <20061110223236.GD72658@ace.b020.ceid.upatras.gr> In-Reply-To: <4554F4C6.3090802@infracaninophile.co.uk> References: <20061110203714.GA89006@ace.b020.ceid.upatras.gr> <20061110124459.M88944@turing> <20061110213313.GA72658@ace.b020.ceid.upatras.gr> <4554F4C6.3090802@infracaninophile.co.uk>
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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)... \n\n
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