Date: Tue, 22 Feb 2005 22:04:44 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: "Kevin Oberman" <oberman@es.net>, "Robert Watson" <rwatson@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: HZ in RELENG_5? tcp_subr.c related Message-ID: <opsml956br8527sy@outgoing.local> In-Reply-To: <20050222205206.C7B4A5D07@ptavv.es.net> References: <20050222205206.C7B4A5D07@ptavv.es.net>
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Just put something like this in /boot/loader.conf. kern.hz="250" It works for me since a long time (freebsd 4 I think). Ronald. On Tue, 22 Feb 2005 12:52:06 -0800, Kevin Oberman <oberman@es.net> wrote: >> Date: Tue, 22 Feb 2005 19:56:03 +0000 (GMT) >> From: Robert Watson <rwatson@FreeBSD.org> >> >> >> 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. > > Let's keep STABLE stable. If there are timing issues with HZ of 1000 in > V5, we clearly would not want to change before they are resolved. > Happily, I have not see these on my faster systems and have not > increased HZ on anything < 1 GHz. > > If I do see network problems, now I know another place to look, too. > > Thanks! -- Ronald Klop Amsterdam, The Netherlands
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