From: dfevans@bbcr.uwaterloo.ca (David Evans)
Subject: [pups] Progress on 2.11BSD kernel
Date: Wed, 19 Mar 2003 18:15:16 -0500 [thread overview]
Message-ID: <20030319181516.A18264@bcr10.uwaterloo.ca> (raw)
In-Reply-To: <200303192308.h2JN8kD04865@moe.2bsd.com>; from sms@2BSD.COM on Wed, Mar 19, 2003 at 03:08:46PM -0800
On Wed, Mar 19, 2003 at 03:08:46PM -0800, Steven M. Schultz wrote:
> > OK. From what I recall (that turned-off machine again...) the entire
> > discussion on tuning MAXUSERS and friends is based on allocation of UMRs.
> > Might be a good idea to slip in a note about what to do when you don't have
>
> It is less a matter of MAXUSERS than it is of NBUF. NBUF sets
> the number of disc cache buffers.
Yeah, sorry, it was NBUF that I was thinking of. It's been aboutn a month
since I've had a chance to fiddle with my /73.
> The other constraint, even for Qbus systems, is the D space requirement.
> The 1KB portion of the disc buffer is "external" to the kernel (is
> mapped in/out as needed) but there is a header structure which is
> part of the kernel's permanent address space. Each buffer header is
> 24 bytes so even without UMRs around it's not feasible to have a 200KB
> cache because that'd use 4800 bytes of kernel D space (which is always
> on the edge of being overflowed it seems).
>
Cool, thanks.
--
David Evans (NeXTMail/MIME OK) dfevans at bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo "Default is the value selected by the composer
Ontario, Canada overridden by your command." - Roland TR-707 Manual
next prev parent reply other threads:[~2003-03-19 23:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-19 23:08 Steven M. Schultz
2003-03-19 23:15 ` David Evans [this message]
2003-03-19 23:34 ` Johnny Billquist
-- strict thread matches above, loose matches on Subject: below --
2003-03-21 18:33 Steven M. Schultz
2003-03-21 18:26 Steven M. Schultz
2003-03-19 23:52 Steven M. Schultz
2003-03-19 19:09 Steven M. Schultz
2003-03-19 19:30 ` David Evans
2003-03-19 19:06 Carl Lowenstein
2003-03-19 19:14 ` David Evans
2003-03-19 20:12 ` David C. Jenner
2003-03-19 17:51 Steven M. Schultz
2003-03-19 18:08 ` David Evans
2003-03-19 17:36 Steven M. Schultz
2003-03-19 17:46 ` David Evans
2003-03-19 18:24 ` Ian King
2003-03-19 18:59 ` David Evans
2003-03-21 18:08 ` Ian King
2003-03-19 7:44 Ian King
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