Date: Fri, 11 Jan 2002 04:39:29 -0800 From: Peter Wemm <peter@wemm.org> To: Chris Faulhaber <jedgar@fxp.org> Cc: scottl@FreeBSD.org, smp@FreeBSD.org Subject: Re: P5 vs. SMP, part 2 Message-ID: <20020111123929.2536138FD@overcee.netplex.com.au> In-Reply-To: <20020108000825.GA60374@peitho.fxp.org>
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Chris Faulhaber wrote: > On Mon, Jan 07, 2002 at 03:50:35PM -0800, Peter Wemm wrote: > > Chris Faulhaber wrote: > > > I finally got around to narrowing down the commit (see > > > below) that slowed by dual P5 box. From my original > > > message to -smp: > >=20 > > !!!!. > >=20 > > I just reread the diff and I dont see anything obviously wrong. Do you j= > ust > > see this in P5 machines? (ie: do you have a P6 smp box as well?) > >=20 > > I have been in contact with a few other people that are also > having problems with their P5's. Gunnar Pruessner reported > a similiar problem at: > http://www.freebsd.org/cgi/getmsg.cgi?fetch=3D5782+15738+/usr/local/www/db/= > text/2001/freebsd-smp/20011007.freebsd-smp > > We have not had any problems on the dual and quad PIII's at > work and I have not seen anyone using P6's report anything > similiar. After some extended trauma (blew up a hard drive), I got my box working. Wow! the slowdown is spectacular. It is running 4.4-RELEASE right now and it is immediately obvious just while booting that it is broken. After it's up, running top takes between 4 and 8 seconds to start up. It's nearly instant in UP mode. If I ktrace it, top takes 26 seconds to start up. Most of the time seems to be spent doing lseek/read of either /dev/mem or /dev/kmem. I'm going to go through this in detail tomorrow after some sleep. At 4:30am I can't think straight. :-] Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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