Date: Mon, 28 Jun 1999 21:55:30 +0200 (SAT) From: John Hay <jhay@mikom.csir.co.za> To: dillon@apollo.backplane.com (Matthew Dillon) Cc: freebsd-smp@FreeBSD.ORG Subject: Re: high-efficiency SMP locks - submission for review Message-ID: <199906281955.VAA17112@zibbi.mikom.csir.co.za> In-Reply-To: <199906281947.MAA24287@apollo.backplane.com> from Matthew Dillon at "Jun 28, 1999 12:47:25 pm"
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> :> The 386, I doubt has it. There have been a couple of suggestions for ending > :> the support for the 386 as it will simplify some ugly code for emulating > :> kernel-mode write faults etc, but it's never happened. Apparently the > :> 386 is common in some areas still. > : > :The 386 is still used a lot in embeded systems. (With FreeBSD running on > :some of them. :-) > : > > Since 386's are UP systems, I think it would be fairly easy to implement > the UP version of the compare-and-exchange primitive trivially with an > spl wrapper. We should be able to freely use use the cmpxchg instruction > on SMP systems. > Yes, I understand that and my worry wasn't about the lock code, but it sounded like somebody was sharpening an ax for the 386 code and I just wanted to show that it was still used. :-) John -- John Hay -- John.Hay@mikom.csir.co.za To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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