Date: Thu, 11 Jul 2002 22:44:13 -0500 (CDT) From: hawkeyd@visi.com (D J Hawkey Jr) To: dillon@apollo.backplane.com, freebsd-stable@freebsd.org Subject: Re: tuning(7) request was: Re: Performance boost with kernel options in FBSD 4.6 Message-ID: <200207120344.g6C3iDS63523@sheol.localdomain> In-Reply-To: <200207111930.g6BJUX5m096974_apollo.backplane.com@ns.sol.net> References: <04a601c228dc$c6dbb980$681663cf_icarz.com@ns.sol.net> <200207111930.g6BJUX5m096974_apollo.backplane.com@ns.sol.net>
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In article <200207111930.g6BJUX5m096974_apollo.backplane.com@ns.sol.net>, dillon@apollo.backplane.com writes: > >: >: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 > > I could put a general admonition in tuning(7) about Hz, but the > performance effects are going to be highly dependant on the situation. > > Generally speaking aggregate performance will not improve if you increase > Hz, but I can see how perceived performance might improve in > certain specific situations such as having a lot of X clients talking > to the server at the same time. > > The issue with X clients is that a single interactive operation done on > the client may result in dozens of interactive packet ops occuring > between client and server, many of which cannot be pipelined... > > [ SNIP] > > But for most people it just doesn't matter. In your estimation, would it affect the case of several chained pipes, [doing|waiting on] disk I/O? Or, say, a complex SQL query? Sorry for my naivete, but would increasing the HZ have the effect of making the rest of my activities "snappier" in the above situation? Or is this still too vague? The machines are 700Mhz Celerons and "better", mostly IDE, BTW. > -Matt Thanks, Dave -- Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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