Date: Tue, 22 Feb 2005 19:56:03 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Kevin Oberman <oberman@es.net> Cc: freebsd-stable@freebsd.org Subject: Re: HZ in RELENG_5? tcp_subr.c related Message-ID: <Pine.NEB.3.96L.1050222195429.68237B-100000@fledge.watson.org> In-Reply-To: <20050222193858.1C18C5D07@ptavv.es.net>
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On Tue, 22 Feb 2005, Kevin Oberman wrote: > > In RELENG_5, the default HZ for amd64 is 1000, but for all other platforms > > it is 100. So amd64 users will see a ten-fold decrease in tcp_isn_tick() > > running, but i386 (and other) users will see no change. > > Now that 5 is STABLE, I guess we are stuck with it, but in an era of > "slow" 2GHz systems, it seems like a questionable choice. I know that > there are a lot of folks running old hardware (like my trusty old K6), > but they are a minority and changing HZ is not a big deal. Why make the > majority live with 100 on fast systems or know enough to manually change > it? > > Has there been discussion of changing this for V6 or is there a reason I > missed for keeping HZ at 100 in the iX86 platforms. In 6-CURRENT, HZ is 1000 for amd64, i386, and ia64, but 100 for other platforms (i.e., ppc, arm, and alpha). I'm not opposed to merging the HZ change to RELENG_5 at some point, but given that occasional nits, such as the TCP nit, are turning up, I think it's worth waiting until after 5.4. Robert N M Watson
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