SUMMARY: Solaris 2.5 - NOTICE: zs3: ring buffer overflow

From: Chin Fang (
Date: Tue Jan 23 1996 - 12:58:26 CST

Dear fellow Sun Managers,

First of all, thanks to the following kind Sun managers who responded to
my question.

Tony Walton <tony.walton@UK.Sun.COM> (Andrew Foote) (Robin Connell) (Kevin Sheehan {Consulting Poster Child})
Bill Krauss <>
smckinty@sunicnc.France.Sun.COM (Steve McKinty - SunSoft ICNC Grenoble) (Steve Butterfield)
Jens Fischer <> (Glenn Satchell - Uniq Professional Services)
Casper Dik <casper@holland.Sun.COM>

My original question:

This afternnon, I was playing with the Solaris 2.5's ifconfig IFS:n logical
interface feature. Since the man page claims it can accomodate 1-255 so
I wrote a small sh script to give the le0 interfaces 255 IPs.

After rebooting, this message shows up on the console:

NOTICE: zs3: ring buffer overflow

Everything seems to be working fine even with this message. I looked into
SPARC: Installation Notes Solaris 2.5 Chapter 4, Late-Breaking Solaris Patches
but didn't see any mentioning of this.

Any ideas where to look further?

The gist of all responses are summarized below:

(1) the documented info can be found in the zs man page on line zs(4S)
(2) for zs3, it's mouse serial comms driver (the 3 indicates so)
(3) during rebooting, if the mouse is moved, such messages show up.
    This is documented in the FAQ for comp.sys.sun.admin, which I
    forgot to check :(
(4) it's harmless if shows up only accationally during reboot.
    Again, this is stated in the aforementioned FAQ.

I still have reservations about the messages. It seems to me if you
wants to use the logical interface assignment feature and to run DNS
on the same machine, the named interface binding seems to make the
machine particularly fragil, lots messages would show up which won't
otherwise. Named would crash, the OS may ill behaving (e.g Openwin
core dumps. This is true both for SunOS 4.1.x and SunOS 5.x) Running
either DNS or logical interfaces on the same machine is not a problem
(I have tried) So looks like this is the route we will be taking. No
more cohosting of DNS and logical interfaces.

BTW, the zs3 overflow messages never showed up before I activated both.

Thanks again to all who responded.


Chin Fang

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