Date: Wed, 10 Jul 2002 10:58:49 +0200 (CEST) From: "Hartmann, O." <ohartman@klima.physik.uni-mainz.de> To: freebsd-stable@freebsd.org Subject: Performance boost with kernel options in FBSD 4.6 Message-ID: <20020710104730.L10343-100000@klima.physik.uni-mainz.de>
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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
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