Date: Sat, 14 Dec 1996 09:45:16 +0800 From: Peter Wemm <peter@spinner.dialix.com> To: Steve Passe <smp@csn.net> Cc: "Erich Boleyn,,,," <erich@uruk.org>, smp@freebsd.org Subject: Re: Tried SMP kernel from early morning CVS tree Message-ID: <199612140145.JAA13805@spinner.DIALix.COM> In-Reply-To: Your message of "Fri, 13 Dec 1996 18:08:09 MST." <199612140108.SAA09847@clem.systemsix.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Steve Passe wrote: > Hi, > > > Hi all. I tried the SMP kernel from the CVS tree from early this > > morning. It still has the problem on my 4-CPU Pentium Pro test box > > where a long compile kills it by getting a kernel page fault in > > pmap_enter. > > I wish I knew how to help with this, but I have neither a P6 machine or > skills/knowledge in this area... I've been taking advantage of the lull to > go thru my code and cleanup a lot of little details that have fallen > thru the cracks. Same here, but I've been out of action for different reasons (like: doing some final work on a new house and preparing to move). There were some good details posted on this problem a few days ago from the other person with the P6 system, there is probably a good clue in there. My initial reaction to the details was that it almost looked like both cpu's accessed a shared data structure at nearly the same time, which should be impossible due to the locking. I can't imagine why this might be happening yet, but I must re-examine that part of the code. An extra local tlb flush might help, but I'm not 100% sure yet. On the other hand: % uname -a FreeBSD spinner.DIALix.COM 3.0-SMP FreeBSD 3.0-SMP #154: Thu Dec 5 02:26:10 WST 1996 peter@spinner.DIALix.COM:/home/peter/smp/sys/compile/SMP i386 % uptime 9:38AM up 9 days, 7:04, 12 users, load averages: 0.00, 0.01, 0.00 This machine has had the stuffing hammered out of it over the last week, I'm really happy with the stability of the P5 systems apart from the Floating point problems. This kernel was built with APIC_IO+APIC_LAZY+SMP_INVLTLB, and I've had none of the subtle corruption problems that I used to have before SMP_INVLTLB. It's been easy to forget that it's running SMP most of the time. :-) Cheers, -Peter
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199612140145.JAA13805>