Date: Wed, 04 Mar 1998 20:46:36 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Stephen McKay <syssgm@dtir.qld.gov.au> Cc: current@FreeBSD.ORG Subject: Re: silo overflows (Was Re: 3.0-RELEASE?) Message-ID: <XFMail.980304204636.shimon@simon-shapiro.org> In-Reply-To: <199803050341.NAA08541@troll.dtir.qld.gov.au>
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On 05-Mar-98 Stephen McKay wrote: > Simon Shapiro wrote: >> >> How about getting rid of that ``%d more silo overflow..'' message? I am >> too limited in my understanding device drivers to see why that happens. >> I though that UARTs and RS-232C were well understood. > > Do you have a Matrox Millennium? I borrowed a Matrox Millennium II for > a while and put it in my Pentium 133 box. Suddenly I got silo overflows > when there was simultaneous incoming serial data and X activity (like > scrolling a 60 line xterm window). When I returned the Millennium and > put my Trio64V+ card back in, all serial problems disappeared. At the > time, > I was running the serial port at only 38400, but now run it at 115200 > with > no problems. > > I didn't do enough investigation to even guess at the cause. I looked in > the XFree86 server code for interrupt disabling but found nothing > interesting. > > I was wondering though if any PCI experts knew if a PCI video card could > starve the PCI-ISA bridge of cycles. Any experts out there? Now this is really interesting. There is a Matrox Millenium in the machine but it does no X at the moment. A Matrox will not be happy with a COM4 port. They stomp on each other. So does an ATI Mach64. Yes, a nasty video card will do ugly things to the PCI bus. BTW, most these S3 cards will not work across a PCI-PCi bridge. Never understood why... ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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