Date: Thu, 22 Jul 1999 12:45:33 -0600 From: Nate Williams <nate@mt.sri.com> To: Terry Lambert <tlambert@primenet.com> Cc: nate@mt.sri.com (Nate Williams), scheper@beast.toad.net, freebsd-smp@FreeBSD.ORG Subject: Re: SMP + XDM = keyboard lockup Message-ID: <199907221845.MAA03196@mt.sri.com> In-Reply-To: <199907221839.LAA10550@usr05.primenet.com> References: <199907221812.MAA02907@mt.sri.com> <199907221839.LAA10550@usr05.primenet.com>
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> > > The xdm program, among other things, starts X. > > > > > > I believe the issue is one CPU running X doing inb/outb's while > > > the other CPU is in the kernel -- doing the same. > > > > Why would the other CPU doing the same inb/outb's as X? By the time > > init is run, the kernel is done 'setting up' the kernel. > > It wouldn't be. > > It would merely be trying to latch different addresses on the I/O > bus and/or write data to the previously latched address, at the > same time. > > Basically, user space code should keep its cold, wet nose out of > the kernels crotch. > > I believe the issue is the system is still starting up, and thus > has the kernel poking at things. It shouldn't be. The kernel is completely done 'starting up', else all the /etc/rc.* files wouldn't have been run and init wouldn't have started spawning off gettys. > You could guess that the init and the X server might be running > on different CPU's, but then you would expect the /etc/ttys file > based xdm startup to work. Right. > This jibes with his statement that manually starting the xdm from > a root shell prompt on a relatively quiescent system "works". It > is likely that it "works" only because there is not simultaneous > activity. Or there is a a race in the video/keyboard driver that is causing problems. X calls into the driver, so it's possible a missing spl() or somesuch is causing problem. I doubt very much the problem is related to inb/outb, and is instead a just a 'bug'. :) Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the messagehome | help
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