TTYMON on v240 consumes excessive cpu time.

Asset ID:	1-72-1002446.1
Update Date:	2009-09-28
Keywords:

Solution Type Problem Resolution Sure

Solution 1002446.1 : TTYMON on v240 consumes excessive cpu time.

Related Items


Sun Fire V240 Server
 Sun Fire V210 Server
 Solaris SPARC Operating System

Related Categories


GCS>Sun Microsystems>Servers>Entry-Level Servers
 GCS>Sun Microsystems>Operating Systems>Solaris Operating System

PreviouslyPublishedAs
203419

Symptoms
Installed Bi-Directional modem on ttyb on Sun Fire[TM] V240.

# pmadm -l
PMTAG          PMTYPE         SVCTAG         FLGS ID       <PMSPECIFIC>
zsmon          ttymon         ttyb           u    root     /dev/term/b b - /usr/bin/login - 57600   ldterm,ttcompat login:  - - n  #Modem - Bidirectional
Though, modem is not in use its ttymon process is consuming close to 40% cpu time.
# ps -ef | grep ttymon
PID USERNAME THR PRI NICE  SIZE   RES STATE   TIME    CPU COMMAND
440 root       1  20    0 1840K 1128K run   3328.4 97.53% ttymon

Resolution
This is known problem with V240's running Solaris[TM]10 or 9 with a Bi-Directional modem configured on ttyb. May also occur with Solaris[TM] 8 07/03.

The problem is caused by a regression introduced with the fix for bug
4028137 - serial line hangs and gets "link down".
The problem will occur if the following patches are installed.
Solaris[TM]10 w/ 118557-04, 119574-02 and 118868-01
Solution-  1.) Install 118557-05 or above. 2.) Upgrade to s10u3_02.
Solaris[TM] 9 w/ 113077-17 and 123056-01
Solution-  Install 113077-20 or above
Solaris[TM] 8 w/ 109793-28 or above.
Solution-  Install 109793-31 or above
Alternate solution to the above.
Possible hung login process. Kill ttymon process. It will respawn a new ttymon process.

Relief/Workaround

Solaris[TM] 9:
Backout 113077-17 and 123056-01 then install 113077-16 or below only.
Solaris[TM] 8:
Backout 109793-28 to 109793-27 or below.

Additional Information
Problem may also appear with Sun Fire[TM] V210.

Setting ttyb-ignore-cd to false has no effect.

Product
Solaris 9 Operating System SPARC Platform Edition
Solaris 10 Operating System
Solaris 8 HW 07/03
Sun Fire V240 Server
Sun Fire V210 Server

v240, sun fire, modem, ttymon, cpu, consume
Previously Published As
86736

Change History
Date: 2007-07-06
User Name: 95826
Action: Approved
Comment: - verified metadata
- review date ok : 2008-07-05
- checked for TM - none added
- checked audience : contract
- no further edit required
Publishing
Version: 8
Date: 2007-07-05
User Name: 95826
Action: Accept
Comment:
Version: 0

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