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Date:      Fri, 20 Mar 1998 16:41:21 +0000 (GMT)
From:      Rob Hartill <robh@imdb.com>
To:        stable@FreeBSD.ORG
Subject:   No disk cache after memory upgrade (2.2/pii-300/512mb)
Message-ID:  <Pine.BSF.3.96.980320162905.2937D-100000@localhost>

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Yesterday we added 256mb to a batch of servers, doubling them to 512k.

One of the batch was running an older kernel/world than the others. The
older one was circa Dec97 (cvsup'ed 2.2 stable) and the others were circa
Feb 98.

We removed "options         BOUNCE_BUFFERS" from the kernel after
reading about problem with >256mb.

Installing the same kernel on all machines, they all rebooted fine, however
the most out of date server showed no sign on any 'Cache' being used
under 'top', instead it showed tons of 'Free' memory. The other machines
filled their caches up just fine (which was our primary goal in adding
more memory).

Thinking the kernel (taken from one of the more recent servers) might not
quite match with the rest of the world, we built a new kernel on the older
box, same problem; next we tried a complete make world on cvsup'ed
sources from yesterday (2.2.6-BETA) - same problem.

Anyone seen this ?

The /etc/rc* files look up to date.

The machines are 300mhz PIIs.

baffled,
rob
--
Rob Hartill                              Internet Movie Database (Ltd)
http://www.moviedatabase.com/   .. a site for sore eyes.


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