Date: Mon, 07 Aug 2000 15:14:56 -0700 From: David Greenman <dg@root.com> To: Paul Richards <paul@originative.co.uk> Cc: Poul-Henning Kamp <phk@critter.freebsd.dk>, Alfred Perlstein <bright@wintelcom.net>, Matt Dillon <dillon@earth.backplane.com>, Mike Smith <msmith@FreeBSD.ORG>, Stephen McKay <mckay@thehub.com.au>, freebsd-current@FreeBSD.ORG, dillon@FreeBSD.ORG Subject: Re: Ugly, slow shutdown Message-ID: <200008072214.PAA04340@implode.root.com> In-Reply-To: Your message of "Mon, 07 Aug 2000 23:21:48 BST." <398F367C.27DD39DA@originative.co.uk>
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>I did say "as a general rule". If you know that "by design" nothing else >is going to mess with what you're sleeping on before you wake up then >you can make tighter optimisations but that's not the general case. >There is such a thing as over optimisation though and for the sake of a >simple if statement it is probably better to write code that is robust >to changes made elsewhere in the system rather than squeeze every inch >of performance out of the code, unless there's a real need to optimize >in that particular area. In some cases it isn't practical or very expensive to verify that the condition that caused the sleep in the first place has been satisfied - that's often why certain parts of the kernel rely on the established tsleep symantics. -DG David Greenman Co-founder, The FreeBSD Project - http://www.freebsd.org Manufacturer of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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