Date: Sat, 16 Dec 1995 04:52:23 +0400 (BSK) From: Ran <ran@nic.aic.net> To: dennis@etinc.com (dennis) Cc: hackers@freebsd.org Subject: Re: sio overruns on 2.0.5R Message-ID: <199512160052.EAA05001@nic.aic.net> In-Reply-To: <199512152328.SAA14493@etinc.com> from "dennis" at Dec 15, 95 06:28:30 pm
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> > >>> After I switched to a Asus P55TP4XE 90Mc I see things like > >>> > >>> sio0: 5 more silo overflows (total 7) > >>> > >>> The Asus supposedly has 16550A UARTs, of which I use one. > >>> > >>> On my previous MB, a 25Mc 486DX > >>> I used an AST/4 with 16550A chips without a single silo overflow. > >>> I also have the impression the UUCP datarate is now slower than > >>> before. > >>> > >>> This is a 14K4 modem BTW, on a 57600 baud line. > > > >>I hate to sound like a broken record, but are you *sure* you're using > >>flow-control? Can you use stty on the connected end to make sure? > > > >Er, flow control has no effect on silo overflows. > > > >Perhaps the problem is a downgrade to a bus-hogging DMA controller. > > > > Ah...bus mastering controllers! So unpredictable. > > Does anyone know how these on-board IDE/IO asics are bussed to the system? > If they're bridged they could have secondary interrupts or something..... > > I would disable the on-board uart and try the same AST board you used before > successfully just to see if it works.. Many of those IO asics emulate 16550s > but they're > not as good. > > Dennis > ---------------------------------------------------------------------------- > Emerging Technologies, Inc. http://www.etinc.com > > Synchronous Communications Cards and Routers For > Discriminating Tastes. 56k to T1 and beyond. Frame > Relay, PPP, HDLC, and X.25 > > disable irq on your videocard or replace it. hrant.
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