Date: Tue, 23 Nov 1999 15:09:59 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Peter Wemm <peter@netplex.com.au> Cc: Tommy Hallgren <thallgren@yahoo.com>, freebsd-smp@FreeBSD.ORG Subject: Re: Matt's new unlock optimiazation Message-ID: <28648.943366199@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 23 Nov 1999 22:01:28 %2B0800." <19991123140128.3A7D41C6D@overcee.netplex.com.au>
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In message <19991123140128.3A7D41C6D@overcee.netplex.com.au>, Peter Wemm writes : >Tommy Hallgren wrote: >> Hi subscribers! >> >> FYI, this popped up in the linux-kern mailing-list: >> http://boudicca.tux.org/hypermail/linux-kernel/this-week/0060.html >> >> The entire thread is here: >> http://boudicca.tux.org/hypermail/linux-kernel/this-week/subject.html#start >> >> The subject is: spin_unlock optimization(i386) > >A bit worrying, to say the least, especially coming from Linus (even moreso >in light of his work at transmeta and what they're doing with/to Intel cpu's). We (Peter and I :-) actually have been there once before, in what '96 or '97 when we got SMP on its legs. I didn't comment on Matts stuff because I didn't want to upset him, but I agree with Linus: This doesn't work unless other serialization is added to the code. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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