Date: Fri, 15 Dec 1995 18:28:30 -0500 From: dennis@etinc.com (dennis) To: Bruce Evans <bde@zeta.org.au> Cc: hackers@freebsd.org Subject: Re: sio overruns on 2.0.5R Message-ID: <199512152328.SAA14493@etinc.com>
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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
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