Date: Sun, 19 Sep 1999 11:45:22 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: wwoods@cybcon.com Cc: freebsd-alpha@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Silo Overflows on Alpha...... Message-ID: <199909191845.LAA17531@lestat.nas.nasa.gov>
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On Sun, 19 Sep 1999 04:58:44 -0700 (PDT)
William Woods <wwoods@cybcon.com> wrote:
> I have an Alphastation 200 4/233 running 3.2-R (I am TRYING to cvsup to
> 3.3-Stable) and I keep getting silo overflows when connected to the net with an
> external modem at anything over 9600.
NetBSD's `com' driver uses a split interrupt scheme to help this a little,
and can do 56k on the Alpha pretty easily. However, above that, it still
gets overruns due to the OSF/1 PALcode's interrupt scheme; all interrupts
are routed to what is effectively one interrupt level in the PSL sense; there
are actually two, but since you have no way of knowing what processor IRQ
is routed to which IPL, and no way to program the routing yourself, you
have to block both in order to block "I/O interrupts".
-- Jason R. Thorpe <thorpej@nas.nasa.gov>
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