Date: Sun, 19 Sep 1999 11:36:49 -0700 From: Mike Smith <mike@smith.net.au> To: wwoods@cybcon.com Cc: Kent Stewart <kstewart@3-cities.com>, freebsd-questions@FreeBSD.ORG, freebsd-alpha@FreeBSD.ORG Subject: Re: Silo Overflows on Alpha...... Message-ID: <199909191836.LAA25719@dingo.cdrom.com> In-Reply-To: Your message of "Sun, 19 Sep 1999 11:37:02 PDT." <XFMail.990919113702.wwoods@cybcon.com>
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The problem is simply that the Alpha interrupt handling code hasn't been optimised yet, and it's too slow to service a primitive UART like the 16x50 family. Put the modem somewhere else (eg. on a PC), or get a better network connection where the I/O hardware sits on your ethernet. For about six months I used a Cisco 2501 with a modem hung off the Aux port. This worked just fine, and if it had silo overflows I never heard about them. 8) > Just to follow up a bit on this.... > > dmesg says that the port is a : > > sio0 at port 0x3f8-0x3ff irq4 on isa0 > sio0: type 16550A > > does this mean I am basically screwed? > > On 19-Sep-99 Kent Stewart wrote: > > I don't have an Alpha but on a PC this isn't a usually an OS problem. > > It is most often a uart problem. It happens when you have an external > > moden connected to a com port running to 16450 or less uart. If you > > have a 16550Afn or modern equivalent, then you have to up the fifo > > count where the interrupts occur to 14. The internal modems have the > > equivalent of a 16550 built in and don't have the problem for that > > reason. Somewhere above 9600, the interupt latency is such that the > > system can't respond and you get an overflow. My PC has the equivalent > > of a 16550 built onto the motherboard and the connection to the > > external modem is at 115,200 baud. This will handle a 56kb modem. You > > are supposed to have the DTE rate set to 4 times the DCE rate but > > 115,200 is as high as it goes on my computers. > > > > Kent > > > > William Woods wrote: > >> > >> I have an Alphastation 200 4/233 running 3.2-R (I am TRYING to cvsup to > >> 3.3-Stable) and I keep getting silo overflows when connected to the net with > >> an > >> external modem at anything over 9600. > >> > >> The exact messages are: > >> > >> Sep 17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 300) > >> 17 22:10:45 alpha /kerne;: sio0: 1 more silo overflow (total 301) > >> 17 22:11:15 alpha /kerne;: sio0: 1 more silo overflow (total 302) > >> 17 22:11:30 alpha /kerne;: sio0: 1 more silo overflow (total 303) > >> 17 22:11:45 alpha /kerne;: sio0: 1 more silo overflow (total 304) > >> 17 22:12:00 alpha /kerne;: sio0: 1 more silo overflow (total 305) > >> 17 22:12:15 alpha /kerne;: sio0: 1 more silo overflow (total 306) > >> 17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 307) > >> 17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 308) > >> > >> etc......... > >> > >> I know I had this problem about 5 months ago, then I dident use the Alpha > >> for a > >> while. Now I am HOPEING that this is somewhat fixed in 3.3 (If I can ever > >> cvsup > >> the sources, I will find out). > >> > >> Can anyone shed some light on this... > >> > >> ---------------------------------- > >> E-Mail: William Woods <wwoods@cybcon.com> > >> Date: 18-Sep-99 > >> Time: 22:37:32 > >> This message was sent by XFMail > >> --- > >> > >> To Unsubscribe: send mail to majordomo@FreeBSD.org > >> with "unsubscribe freebsd-questions" in the body of the message > > > > -- > > Kent Stewart > > Richland, WA > > > > mailto:kstewart@3-cities.com > > http://www.3-cities.com/~kstewart/index.html > > > > SETI (Search for Extraterrestrial Intelligence) @ Home > > http://setiathome.ssl.berkeley.edu/ > > ---------------------------------- > E-Mail: William Woods <wwoods@cybcon.com> > Date: 19-Sep-99 > Time: 11:35:17 > This message was sent by XFMail > ---------------------------------- > > -----BEGIN GEEK CODE BLOCK----- > Version: 3.1 > GIT d++ s+:+ a C+++ UB+++ P+ L++ E- W++ N+ o+ K- w > O- M-- V PS-- PE++ Y+ PGP t+ 5+ X R- tv- b++ DI+ D > G e++ h---- r+++ y++++ > ------END GEEK CODE BLOCK------ > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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