Date: Thu, 11 Jul 2002 09:13:41 -0400 From: "Ken Menzel" <kenm@icarz.com> To: <freebsd-stable@FreeBSD.ORG> Subject: tuning(7) request was: Re: Performance boost with kernel options in FBSD 4.6 Message-ID: <04a601c228dc$c6dbb980$681663cf@icarz.com> References: <20020710104730.L10343-100000@klima.physik.uni-mainz.de>
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Hi, If it's possible this makes a difference can we get a note about HZ added to the tuning(7) man page? Thanks Ken ----- Original Message ----- From: "Hartmann, O." <ohartman@klima.physik.uni-mainz.de> To: <freebsd-stable@FreeBSD.ORG> Sent: Wednesday, July 10, 2002 4:58 AM Subject: Performance boost with kernel options in FBSD 4.6 > Dear Sirs. > > I followed an interesting dispute in this list about setting > the kernel option HZ=100 to HZ=10000. > > No one can say exactly what kind of hardware is 'fast enough' to > obtain benefits from setting this granularity option to that high value, > so each administrator has to do several efforts to examine whether > its hardware is suitable to switch o HZ=10000 or not. > > We use several SMP systems around here, some have special server > mainboards (Slot1 type, TYAN Thunder 2500), some new UP systems > with P4/ASUS P4TE main PCB and a low cost SMP system with > ASUS CUV4X-D PCB. On all these systems it seems to my subject > that performance or 'reaction' time has significantly increased. > > I did not test the behaviour under extremely heavy load, but > within our normal duties and daily work (webserver, MySQL server, > NFS server (UPD NFS/3), DHCP boot server, SAMBA server, analytical > number crunching with smaller applications in F77 and/or PGI pgf90 > under Linuxulator) it is a very convenient experience to see > how smooth these machines operate now. > > We also have a lot of pure diskless clients for X11 terminal services, > based on 750 MHz Duron and 64 MB PC133 slow SDRAM, Intel Pro/100+ > NICs. They also now have HZ set to 10000 and they also seem to operate > faster. > > Well, this is a subjective impression, not aproved by measurements. > > -- > MfG > O. Hartmann > > ohartman@klima.physik.uni-mainz.de > ------------------------------------------------------------------ > IT-Administration des Institutes fuer Physik der Atmosphaere (IPA) > ------------------------------------------------------------------ > Johannes Gutenberg Universitaet Mainz > Becherweg 21 > 55099 Mainz > > Tel: +496131/3924662 (Maschinenraum) > Tel: +496131/3924144 (Buero) > FAX: +496131/3923532 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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