AlphaStation 255 tty-level buffer overflows

[Thomas Laus]

Group:

Are there any known problems with the serial ports in FreeBSD 4.10 Alpha
implementation?  I have a Oncore GPS Reference Clock on sio1 and a Belkin UPS
on sio0.

I seem to be getting tty-level buffer overflows from the sio1 port.  I am
running ntpd from the FreeBSD release.  The ntp reference clock is polled
every 16 seconds.  The ups connection to sio0 is also a polled operation every
5 seconds.  This setup has been running fine on my Athlon 1GHz server for
the past few years.  I became the owner of a few AS255's and decided to put
one of them to use as my ntp server.  My Athlon is also running 4.10 and the 
same
version of all of the base system as the AS255.  It's dmesg lists a 16550A 
serial
controller, the same as the AlphaStation.

I looked through the FreeBSD mailing list archives for any reference to
problems with the AlphaStation serial ports running under FreeBSD, but came up 
short.

My system log:

Oct  7 04:04:06 as255 /kernel: sio1: 320 more tty-level buffer overflows (total 
117556)
Oct  7 04:04:07 as255 /kernel: sio1: 24 more tty-level buffer overflows (total 
117580)
Oct  7 04:12:18 as255 /kernel: sio1: 111 more tty-level buffer overflows (total 
117691)
Oct  7 04:12:19 as255 /kernel: sio1: 88 more tty-level buffer overflows (total 
117779)
Oct  7 04:12:20 as255 ntpd[553]: pps sync disabled
Oct  7 04:20:28 as255 ntpd[553]: pps sync enabled
Oct  7 05:01:29 as255 /kernel: sio1: 33 more tty-level buffer overflows (total 
117880)
Oct  7 05:01:30 as255 /kernel: sio1: 228 more tty-level buffer overflows (total 
118108)
Oct  7 05:01:30 as255 /kernel: sio1: 161 more tty-level buffer overflows (total 
118269)
Oct  7 05:01:30 as255 /kernel: sio1: 161 more tty-level buffer overflows (total 
118430)
Oct  7 05:01:32 as255 /kernel: sio1: 104 more tty-level buffer overflows (total 
118534)
....
shutdown
restart
....
Oct  7 06:53:27 as255 /kernel: sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on 
isa0
Oct  7 06:53:27 as255 /kernel: sio0: type 16550A
Oct  7 06:53:27 as255 /kernel: sio0: interrupting at ISA irq 4
Oct  7 06:53:27 as255 /kernel: sio1 at port 0x2f8-0x2ff irq 3 on isa0
Oct  7 06:53:27 as255 /kernel: sio1: type 16550A
Oct  7 06:53:27 as255 /kernel: sio1: interrupting at ISA irq 3

Tom
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