Date: Tue, 24 Jul 2001 17:02:52 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: Bala Viswanathan <balaviswanathan@hotmail.com> Cc: freebsd-smp@FreeBSD.org Subject: RE: SMP performance Message-ID: <XFMail.010724170252.jhb@FreeBSD.org> In-Reply-To: <F172TlKn4ZHkRQq5xVz00005884@hotmail.com>
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On 24-Jul-01 Bala Viswanathan wrote: > > I have been trying to get some idea of the status of SMP support > in FreeBSD-current especially as far as performance is concerned. I > have looked at the FreeBSD SMP Project page, other related > links and the archives of the various FreeBSD mailing lists. > But have not found any information that appears current. Right now 95+% (and that's somewhat of a guess, but it should be pretty close) is still under the Giant lock. This effectively means interrupts are blocked out of almost all of the kernel, and is equivalent to running the entire kernel at splhigh() using spl() semantics. This should help explain that the performance is not great right now, nor is it going to be great until subsystems are locked and moved out of Giant. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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