Date: Wed, 07 May 1997 08:28:02 -0700 From: Peter Grehan <grehan@Ipsilon.COM> To: Stephen Roome <steve@visint.co.uk> Cc: Terry Lambert <terry@lambert.org>, freebsd-smp@FreeBSD.ORG Subject: Re: Where to start SMP? Message-ID: <199705071528.IAA16545@mailhost.Ipsilon.COM> In-Reply-To: Your message of "Wed, 07 May 1997 14:37:01 BST." <Pine.BSF.3.91.970507143232.6423F-100000@bagpuss.visint.co.uk>
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>>This would let a single SMP kernel work on all >> hardware, regardless of which options must be twiddled to get it to >> go. The alternative is multiple "SMP GENERIC" configurations -- not >> a likely event. > >Maybe, but surely some of the changes to run an efficient SMP system >should come at kernel compile level. Unless FreeBSD moves to a modular >system on the scale of something like HURD this looks likely to decrease >performance. Have a look at http://www.digital.com/info/DTJF03/DTJF03SC.TXT - a single kernel is used, with the lock strategy determined at boot-time. The overhead for this was brought down to just 3% over that of a system that had locks compiled out. So it is possible, but may require some effort. later, Peter.
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