console messages

Posted on 1998-06-11
Medium Priority
Last Modified: 2013-12-27
I noticed some console messages I am unfamiliar with, can anyone tell me anything about them?
Platform is Solaris 2.5 running on Sparc 2.
Didn't suffer any ill effects as far as I know -- Just curious.

Console Messages:

TIOCFLUSH: Timer expired
ttysw - TIOCSWINS2: Timer expired

NOTICE: zs3:ring buffer overflow
Question by:gormenghast

Accepted Solution

jlms earned 300 total points
ID: 2007971
From the Solaris 2.6 answerbook (should apply to your situation):

zsnumber: silo overflow


This message means that the Zilog 8530 character input silo (or serial port FIFO) overflowed before it
    could be serviced. The zs(4S) driver, which talks to a Zilog Z8530 chip, is reporting that the FIFO (holding
    about two characters) has been overrun. The number after zs shows which serial port experienced an

        zs0 - tty serial port 0 (/dev/ttya)
        zs1 - tty serial port 1 (/dev/ttyb)
        zs2 - keyboard port (/dev/kbd)
        zs3 - mouse port (/dev/mouse)


Silo overflows indicate that data in the respective serial port FIFO has been lost. However, consequences
    of silo overflows might be negligible if the overflows occur infrequently, if data loss is not catastrophic, or if
    data can be recovered or reproduced. For example, although a silo overflow on the mouse driver (zs3)
    indicates that the system could not process mouse events quickly enough, the user can perform mouse motions
    again. Similarly, lost data from a silo overflow on a serial port with a modem connection transferring data using
    uucp(1C) will be recovered when uucp discovers the loss of data and requests retransmission of the corrupted

    Frequent silo overflow messages can indicate a zs hardware FIFO problem, a serial driver software problem, or
    abnormal data or system activity. For example, the system ignores interrupts during system panics, so mouse
    and keyboard activity result in silo overflows.

    If the serial ports experiencing silo overflows are not being used, a silo overflow could indicate the onset of a
    hardware problem.

    Technical Notes Another type of silo overflow is one that occurs during reboot when an HDLC line is connected
    to any of the terminal ports. For example, an X.25 network could be sending frames before the kernel has been
    told to expect them. Such overflow messages can be ignored.

The other two messages are related to arcane network stuff, so maybe your network (is it an X.25 network?) is having problems high use.


Author Comment

ID: 2007972

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