Skip site navigation (1)Skip section navigation (2)
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"

next in thread | previous in thread | raw e-mail | index | archive | help
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++: //



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19961230024428.26653.qmail>