The only time we saw idle SLES8 instances hog a system is when we brought up our z/VM 4.3 and it's guests under a 4.2 1st level at our DR site. 12 Linux instances pegged the CPU at 100%. We replaced the 1st level CP nucleus with 4.3, and then everything was normal. We didn't investigate what the incompatibility was, but it shows that some seemingly innocuous combinations of software can cause strange behavior.
Ray Mrohs Energy Information Administration U.S. Department of Energy -----Original Message----- From: John Kaba [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 16, 2004 3:58 PM To: [EMAIL PROTECTED] Subject: Linux Performance Issue We have just recently installed SuSE SLES8 under our VM3.1.0 system, and are experiencing some performance issues. Our Realtime monitor reveals that Linux is utilizing approx 65% of our CPU cycles, but we really have nothing running. I was told by our Linux guy to give it lots of memory, so I defined it with 1G. I'm wondering if this is my problem, or if I might have something else set up wrong. We have Tivoli Directory Server 5.2 fixpack1, DB2 ver 8.2, and websphere express 5.1, but it is not configured yet. We have just installed these products, and they are not being used at all, still we are seeing results like this: --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- --------- Here is our Realtime Monitor results: <>z/VM CPU9672 SERIAL 069692 2G DATE 11/16/04 START 13:37:27 END 14:25:02<> * USERID-> LOGGED %ACT %PGW %IOW %SUS %RUN %ELG :DSK :XST :SPL :CPU :PAG :I/O :STR *TOTALS* 5544 14.7 .0 .0 75.6 24.3 .0 100 100 100 100 100 100 100 LINUX 192 71.3 .0 .0 43.7 56.2 .0 .0 100 .0 65.8 .0 30.9 55.7 VSE2 96 100 .0 .0 90.6 9.3 .0 .0 .0 1.7 14.5 .0 12.1 2.9 TCPIP 96 100 .0 .0 100 .0 .0 .0 .0 .0 7.8 .0 30.7 .9 VSEIPO 96 100 .0 .0 98.9 1.0 .0 .0 .0 11.0 5.5 .0 23.7 1.1 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- --------- Here is a "TOP" listing from our Linux guest: 70 processes: 68 sleeping, 2 running, 0 zombie, 0 stopped CPU0 states: 1.4% user, 4.4% system, 0.0% nice, 93.0% idle CPU1 states: 14.2% user, 3.4% system, 0.0% nice, 81.2% idle Mem: 1008504K av, 953116K used, 55388K free, 0K shrd, 138316K buff Swap: 719896K av, 4K used, 719892K free 668240K cached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND 10871 dmelende 15 0 11372 11M 10632 S 2.9 1.1 7:50 kdeinit 10905 dmelende 15 0 16804 16M 14572 S 2.5 1.6 3:26 kdeinit 23343 jkaba 15 0 1036 1032 828 R 1.5 0.1 0:00 top 10914 dmelende 15 0 12652 12M 11724 S 0.5 1.2 0:28 kdeinit 10890 dmelende 15 0 12980 12M 11848 R 0.3 1.2 1:20 kdeinit 23327 jkaba 15 0 2376 2376 2208 S 0.3 0.2 0:00 sshd 15843 root 15 0 2084 2080 1520 S 0.1 0.2 0:06 db2fmcd 1 root 15 0 208 204 160 S 0.0 0.0 0:04 init 2 root 0K 0 0 0 0 SW 0.0 0.0 0:00 migration_CPU0 3 root 0K 0 0 0 0 SW 0.0 0.0 0:00 migration_CPU1 4 root 25 0 0 0 0 SW 0.0 0.0 0:00 kmcheck 5 root 15 0 0 0 0 SW 0.0 0.0 0:00 keventd 6 root 34 19 0 0 0 SWN 0.0 0.0 8:50 ksoftirqd_CPU0 7 root 34 19 0 0 0 SWN 0.0 0.0 8:36 ksoftirqd_CPU1 8 root 15 0 0 0 0 SW 0.0 0.0 0:07 kswapd 9 root 25 0 0 0 0 SW 0.0 0.0 0:00 bdflush [EMAIL PROTECTED]:~> --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- --------- Here is the directory entry for the Linux Guest: USER LINUX xxxxxxx 1000M 2000M G *----------------------------------------------------- ACCOUNT 442061 LINUX CPU 01 CPUID 111111 CPU 02 CPUID 111222 IPL CMS PARM AUTOCR IUCV ANY IUCV ALLOW MACHINE ESA 10 OPTION MAINTCCW RMCHINFO SHARE REL 2000 XSTORE 32M CONSOLE 01C0 3270 A SPECIAL 0808 CTCA SPECIAL 0809 CTCA SPOOL 000C 2540 READER * SPOOL 000D 2540 PUNCH A SPOOL 000E 3203 A LINK MAINT 0190 0190 RR LINK MAINT 019D 019D RR LINK MAINT 019E 019E RR LINK TCPMAINT 0592 0592 RR --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- ---- Our Real Storage looks like this: q stor STORAGE = 2G Ready; T=0.01/0.01 14:48:39 q xstore XSTORE= 2048M online= 2048M XSTORE= 2016M userid= SYSTEM usage= 3% retained= 0M pending= 0M XSTORE MDC min=10M, max=64M, usage=3% XSTORE= 32M userid= LINUX XSTORE= 2016M userid= (none) max. attach= 2016M Ready; T=0.01/0.01 14:48:43 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
