Date: Sat, 06 Nov 2004 15:50:06 -0800 From: Nate Lawson <nate@root.org> To: Max Laier <max@love2party.net> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern subr_param.c Message-ID: <418D632E.2020402@root.org> In-Reply-To: <200411061859.56624.max@love2party.net> References: <200411061133.iA6BXhHT086940@repoman.freebsd.org> <20041106163748.GB38881@ip.net.ua> <200411061859.56624.max@love2party.net>
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Max Laier wrote: > On Saturday 06 November 2004 17:37, Ruslan Ermilov wrote: >>On Sat, Nov 06, 2004 at 11:33:43AM +0000, Poul-Henning Kamp wrote: >> >>>phk 2004-11-06 11:33:43 UTC >>> >>> FreeBSD src repository >>> >>> Modified files: >>> sys/kern subr_param.c >>> Log: >>> Increase default HZ for i386 to 1000 >>> >>> Revision Changes Path >>> 1.65 +6 -4 src/sys/kern/subr_param.c >> >>What's the motivation for this change? Also, NOTES > > This has been discussed here: > http://lists.freebsd.org/pipermail/freebsd-arch/2004-November/003085.html I was traveling out of the country so I didn't get a chance to comment. The two caveats I'm aware of is a slight loss in processes that are CPU bound and an audio hum from ACPI CPU idling. The latter is rather interesting actually. At hz=100, it's just a quiet low buzz but at 1000, it is readily audible on many laptops and annoying. Windows uses hz=1000 too and has the same problem. I believe it's related to the capacitors and other devices charging/discharging when clocks are stopped. I'm fine with this change and just wanted to make sure people know where these behavioral changes are coming from when reports come in. -- Nate
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