Subject: Re: softdep?
To: Roger Brooks <R.S.Brooks@liverpool.ac.uk>
From: Simon Burge <simonb@telstra.com.au>
List: current-users
Date: 03/27/1999 15:07:54
Roger Brooks wrote:

> Indeed.  I remember poking about on a SunOS 4.1.3 system after running
> the wonderfully-named presto_chango script which modified the kernel
> build files to use the prestoserve.  It hooked the disk driver I/O
> routines in the device switch.  Sun used to claim that it speeded up
> local disk access as well (and by default it would accelerate all
> filesystems, including / /usr and /var), although we never bothered
> trying to measure the performance enhancement.

Reminds me of a little dbx script we used to play with on Ultrix
which set a couple of kernel variables and used some normal memory as
PrestoServe memory.  Totally unreliable in the event of a crash, but
really fast :-)

Simon.