Date: Sun, 29 Dec 1996 18:44:28 -0800 (PST) From: brian@mediacity.com To: dg@root.com Cc: freebsd-smp@freebsd.org Subject: Re: A question of how much memory? Message-ID: <19961230024428.26653.qmail@mediacity.com> In-Reply-To: <199612290259.SAA02634@root.com> from David Greenman at "Dec 28, 96 06:59:56 pm"
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Brian Litzinger wrote: > >However, my assumptions may be wrong, and memory may be shared > >in some way. In which case MAXMEM may need to by 256*1024. > >I've tried this and the kernel fails to boot with a Panic > >message along the lines of unable to [reach/allocate?] bounce > >buffer. > > > >Basically, which is it supposed to work? > David Greenman wrote: > You're correct that your assumption is wrong. All of the memory is shared > in SMP PCs. The reason the machine panics is because you have run out of > kernel virtual memory. You need to more carefully tune the various parameters > in your kernel config file (the ones that take lots of virtual memory like > NMBCLUSTERS). The fact that it doesn't panic with 128MB indicates that you > are right on the edge of running out and the extra kernel data structures > that are allocated to manage 256MB is just enough to run out. > BTW, why do you have bounce buffers configured in your kernel?? That option is turned on in the GENERIC config by default. Shall I comment it out? -- Brian Litzinger Powered by FreeBSD <brian@mediacity.com> http[s]://www.mpress.com speakfree.mpress.com [use -t (GSM)] How to program in c++: //
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