Date: Sat, 31 Mar 2001 19:05:08 -0800 (PST) From: richw@webcom.com To: freebsd-gnats-submit@FreeBSD.org Subject: i386/26261: silo overflow problem in sio driver Message-ID: <200104010305.f31358B95983@freefall.freebsd.org>
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>Number: 26261 >Category: i386 >Synopsis: silo overflow problem in sio driver >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Mar 31 19:10:01 PST 2001 >Closed-Date: >Last-Modified: >Originator: Rich Wales >Release: 4.2-RELEASE >Organization: >Environment: FreeBSD jekyll.richw.org 4.2-RELEASE FreeBSD 4.2-RELEASE #8: Sat Mar 3 21:17:31 PST 2001 richw@jekyll.richw.org:/big/4.2/usr/src/sys/compile/JEKYLL i386 >Description: I'm getting lots of "silo overflow" errors on an internal serial port in my 800-MHz Athlon system. I tried patching isa/sio.c to set a lower receive FIFO threshold, but even with a threshold of FIFO_RX_MEDL, I still get silo overflows unless I reduce the serial port speed to 19200 or slower. The serial port works flawlessly if I run Win98 and Hyperterm -- so I assume the problem is in FreeBSD and not in my hardware. >How-To-Repeat: Sustained high-speed serial input at 38400 or above. >Fix: No fix known. Reducing port speed to 19200 or slower is a workaround, but not a very satisfying one. >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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