Date: Thu, 28 Mar 1996 12:46:47 -0800 (PST) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: batie@agora.rdrop.com (Alan Batie) Cc: phang@cpm.com.my, freebsd-isp@FreeBSD.ORG Subject: Re: BOCA 8 port -> uptime Message-ID: <199603282046.MAA10676@GndRsh.aac.dev.com> In-Reply-To: <m0u2OLj-0008tgC@agora.rdrop.com> from Alan Batie at "Mar 28, 96 12:31:15 pm"
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> > Well, if this is agora, thats understandable, it is also a general purpose
> > time sharring system with users doing all sorts of things on it....
>
> I would expect interrupt handling to be independent of user load, except to
> the extent they are doing things to cause other interrupts.
And in all likely hood it is those ``other interrupts'' that have caused
enough latency for you to see the occasional Silo overflow. I am pretty
familiar with your hardware and am a bit surprized that you are getting
them at all :-(. You system is all bus mastering low latency devices
(I just checked an lsdev output, you do have a _lot_ of sio devices,
that may cause some problems:).
sio29 Idle Serial port: National 16550A or compatible
sio30 Busy Serial port: National 16550A or compatible
sio31 Idle Serial port: National 16550A or compatible
sio48 Idle Serial port: National 16550A or compatible
sio49 Idle Serial port: National 16550A or compatible
I also counted 21 busy sio ports.... a bit beyond the 16 I sighted ...
Probably a reduction of the FIFO threshold from 14 to 8 would totally
eliminate your FIFO overflow problem, afterall it does need to check
49 ISA I/O registers per sio interrupt which takes ~49uS to do. Also
I am not sure, but I think, the BB2016 can live with an ISA I/O recovery
time of 1 BClk at 8Mhz, you may want to check your BIOS settings.
> > agora:rgrimes {141} uptime
> > 10:53AM up 30 days, 3:06, 34 users, load averages: 0.24, 0.21, 0.18
> > agora:rgrimes {142}
>
> I should mention also that in over 10 years of running agora on Xenix-286,
> SVR3, SVR4, FreeBSD 1.1.5 and now FreeBSD 2.1, this is one of a handful
> of instances where I've seen this much uptime.
:-), I was even rather shocked when I saw the 30 day uptime!! I know that
FreeBSD had not fared so well on your system in the past, but it looks like
it has finally reached the ``stabity'' stage.
--
Rod Grimes rgrimes@gndrsh.aac.dev.com
Accurate Automation Company Reliable computers for FreeBSD
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