Date: Sun, 11 Mar 2001 10:15:18 +0200 (IST) From: Roman Shterenzon <roman@harmonic.co.il> To: Rich Wales <richw@webcom.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Silo overflows Message-ID: <Pine.LNX.4.10.10103111014001.18158-100000@shark.harmonic.co.il> In-Reply-To: <20010304065203.30478.richw@wyattearp.stanford.edu>
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I *think* that when I had this problem on a ThinkPad laptop, having 0x00008 | 0x20000 (from sio(4)) solved the problem, though, reading through source, I don't understand why, so it may be a coincidence. On Sat, 3 Mar 2001, Rich Wales wrote: > I'm running 4.2-RELEASE on an 800-MHz Athlon system. One of the > serial ports on this machine is connected to the serial console port > on a second machine (my home firewall/bridge, running 4.2-STABLE). > > The firewall's serial console speed is set to 115200. The builtin > serial ports on both machines are 16550A's. > > I'm getting lots and lots of silo overflows on the Athlon when I > generate a large amount of output from the firewall (e.g., if I do > "ls -ls", the output is badly garbled, and I get kernel messages on > the Athlon about silo overflows). > > The Athlon's serial port (sio1) is using IRQ 3, and is =not= sharing > this IRQ with any other hardware on the system. > > I've 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 console speed to 19200 or slower. > > I'm really surprised that I should be getting silo overflows on an > 800-MHz Athlon -- which, I would think, should have plenty of computing > power available to handle serial interrupts without losing any input. > > It works flawlessly, BTW, if I run Win98 on the Athlon and connect to > the firewall via Hyperterm -- so I assume the problem is in the FreeBSD > serial port driver, and not in my hardware. > > I understand this "silo overflow" problem has been around for a long > time, but I wanted to bring it up again to make sure it wouldn't be > forgotten and would (hopefully) get fixed. > > Rich Wales richw@webcom.com http://www.webcom.com/richw/ > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > --Roman Shterenzon, UNIX System Administrator and Consultant [ Xpert UNIX Systems Ltd., Herzlia, Israel. Tel: +972-9-9522361 ] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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