Quoting Manuel Bouyer <bouyer@antioche.lip6.fr>:
> > 1. This error happens while dialed up to the internet:
> > 
> > Feb 15 17:00:07 kaptah /netbsd: com0: 2 silo overflows, 0
> ibuf floods
> 
> This mean the kernel didn't process the incoming data fast
> enouth.
> What hardware is it, and what else do you have running on this
> box ?

It's an external modem (I'm at work, so don't remember the 
manufacturer/model at the moment, but can get it if needed) with 
a 440FX motherboard, a dual PII 266, with a Viper 330 video 
card, and Awe 64 audio.  The scsi is an adaptec 2940, w/ 
matsushita cdrom (24x) attached, and a 250 Zip.  Any other 
details I missed?
 
> > Feb 15 16:54:14 kaptah /netbsd: cd0(pciide0:1:1):  Check
> Condition on CDB: 0x28 
> > 00 00 00 00 00 00 00 01 00
> > Feb 15 16:54:14 kaptah /netbsd:     SENSE KEY:  Illegal
> Request
> > Feb 15 16:54:14 kaptah /netbsd:      ASC/ASCQ:  Illegal Mode
> For This Track
> > Feb 15 16:54:14 kaptah /netbsd: 
> > Feb 15 16:54:14 kaptah /netbsd: cd0: dos partition I/O
> error
> 
> This is harmless (but I admit the kernel shouldn't be so
> verbose in this case).

Agreed.  It doesn't seem to affect anything except my message 
log size.

> > sd0: could not mode sense (4/5); using fictitious geometry
> > sd0: no disk label
> > 
> > Whenever I mount a zip disk I get the last two lines.
> 
> This is also harmless.

Ditto the above.

> > 4. This error comes up in my daily report (or from iostat
> -x):
> > 
> > iostat: sysctl hw.diskstats failed: Invalid argument
> 
> Do you have out of sync kernel and userland ?

As previously mentioned, this is a 1.6L MP kernal with a 1.6-
RELEASE userland.
-- 
D. E. Evans
<sinuhe@xmission.com>
<http://www.xmission.com/~sinuhe>
If one political tendency kindled my wrath, it was precisely the 
tendency of industrial liberalism to level down all 
civilizations to a single cheap and dreary pattern.  
--George Santayana