silo overflows

[Giorgos Keramidas]

I've been seeing the following for a while now.  Any hints about ways to
track down why this happens or how to fix it?

Sep 25 19:18:36 gothmog kernel: sio1: 2 more silo overflows (total 357)
Sep 25 19:18:45 gothmog kernel: sio1: 2 more silo overflows (total 359)
Sep 25 19:18:46 gothmog kernel: sio1: 1 more silo overflow (total 360)
Sep 25 19:37:03 gothmog kernel: sio1: 3 more silo overflows (total 363)
Sep 25 19:37:14 gothmog kernel: sio1: 1 more silo overflow (total 364)

This is with a relatively recent 6.0-CURRENT on a Celeron @ 1800MHz.

$ uname -v
FreeBSD 6.0-CURRENT #0: Fri Sep 24 00:04:47 EEST 2004     \
sysop at gothmog.gr:/usr/obj/usr/src/sys/GENERIC