Subject: Re: SCSI disks for news server
To: Ale Terlevich <A.I.Terlevich@durham.ac.uk>
From: Mark Brinicombe <amb@physig.ph.kcl.ac.uk>
List: port-arm32
Date: 01/14/1997 14:45:53
On Tue, 14 Jan 1997, Ale Terlevich wrote:
> What's ANNOYING is that the problem with these drivers isn't just the
> slow transfer rates, but also the fact that because they poll the
> hardware, they really hog the CPU, so for instance while compiling a new
> kernel I couldn't really do anything else, no matter now nice I made the
> compiling task.
If you only have one SCSI disc then you can enable interrupts for the SCSI
cards (need to compile a kernel with PTSC_POLL set to zero (see
podulebus/ptscvar.h) and this will improve the latency etc.
I am going to try a driver that disables disconnections and see if that
cures the prob with multiple scsi devices as it is looking like a
reconnection failure is the problem.
Cheers,
Mark
Mark Brinicombe amb@physig.ph.kcl.ac.uk
Research Associate http://www.ph.kcl.ac.uk/~amb/
Department of Physics tel: 0171 873 2894
King's College London fax: 0171 873 2716