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Date: Tue, 28 Oct 1997 06:10:33 -0500 (EST)
From: Thomas David Rivers <rivers@dignus.com>
Message-Id: <199710281110.GAA06120@lakes.dignus.com>
To: perlsta@cs.sunyit.edu, rivers@dignus.com
Subject: Re: sio silo overflows on a P75 @ 38400 baud?
Cc: freebsd-hackers@freefall.FreeBSD.org
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> 
> you are quite possbily over loading your system with a combination of
> writes and swapping (8megs of ram? ewwww)

 Hmm... good point.

> 
> if disk activity is constant it's quite possible to reach a load of 9.0+
> i did while doing a buildworld and making my kernel -j8... it was at like
> 9.6+ at times... pretty cool as X kept freezing for several seconds at a
> time...

 But - the disk activity isn't constant; it's no where near that
(being a little twiddle about every 13 seconds). In fact, uptime
shows my load average as
  7:02AM  up  8:52, 2 users, load averages: 0.00, 0.00, 0.00

 So, I don't believe that's the culprit.

 In the span of this 8:52 hours, though, I've only seen 3 silo
overflows...  So, the issue appears to be intermittent... (which
makes it more aggravating... :-) )

	- Dave Rivers -

> 
> On Mon, 27 Oct 1997, Thomas David Rivers wrote:
> 
> > 
> > I was just wondering - should it be possible, at 38400 baud,
> > in multi-user mode, but nothing else really going on; to get
> > silo overflows on a P75 with 16550 (clone?) UARTs?
> > 
> > I'm doing a SL/IP connection and sending the output of
> > dd'ing a tape back to the P75 system for un-tarring.  The
> > sending system is a P200 (running FreeBSD 2.2-970510.)
> > 
> > I'm getting these silo overflows with 2.2.5.
> > 
> > I'm hoping someone can whip out some figures on the
> > interrupt latency to suggest that a P75 should be able
> > to deal with receiving 38400...
> > 
> > This could, of course, be an artifact of some device
> > holding the bus too long.  The P75 machine is a laptop
> > with a IDE drive (to which I'm writting) and 8 meg of memory;
> > again, running 2.2.5-RELEASE.
> > 
> > 	 - Thanks -
> > 	- Dave Rivers -
> > 
> 
>