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Date:      Mon, 12 May 1997 17:12:07 +0930 (CST)
From:      Michael Smith <msmith@atrad.adelaide.edu.au>
To:        bruce@zuhause.mn.org (Bruce Albrecht)
Cc:        msmith@atrad.adelaide.edu.au, freebsd-current@FreeBSD.ORG
Subject:   Re: Excessive tty-level buffer overflows
Message-ID:  <199705120742.RAA05522@genesis.atrad.adelaide.edu.au>
In-Reply-To: <199705071343.IAA00221@zuhause.mn.org> from Bruce Albrecht at "May 7, 97 08:43:59 am"

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Bruce Albrecht stands accused of saying:
> Michael Smith writes:
>  > Bruce Albrecht stands accused of saying:
>  > > In a five minute period while running uucp via an external sportster
>  > > 33K modem at 57.6 KB on /dev/cuaa1, I received over 123,000 tty-level
>  > > buffer overflows.  This is a dual CPU Pentium Pro Tyan ATX 1668,
>  > > running in single CPU mode.  What does this mean?  Is it a shoddy
>  > > 16550 emulation?  My kernel is from Saturday, or thereabouts.
>  > 
>  > Please read the sio(4) manpage, which explains what a tty-level
>  > overflow is.
>  > 
>  > I don't think it's the serial hardware, but you may have other
>  > problems.
> 
> True.  But even though I was running a make world at the time, I don't
> think a Pentium Pro should not have been able to handle UUCP traffic
> at 57.6K.

Not necesarily; do you nice your builds around?  It's possible that the
UUCP job was simply starved for CPU.

-- 
]] Mike Smith, Software Engineer        msmith@gsoft.com.au             [[
]] Genesis Software                     genesis@gsoft.com.au            [[
]] High-speed data acquisition and      (GSM mobile)     0411-222-496   [[
]] realtime instrument control.         (ph)          +61-8-8267-3493   [[
]] Unix hardware collector.             "Where are your PEZ?" The Tick  [[



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