This is not "the real performance of Linux under VM." This is the real performance of S/390 processors in general. S/390 processors are _slow_ compared to the newer generations of Intel hardware. Don't use them for CPU intensive tasks if you can avoid it. Compressing and decompressing data are CPU intensive tasks, and frequently you can't avoid it, but it is going to run your processor to 100% for a period of time.
Mark Post -----Original Message----- From: Alex Leyva [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 13, 2003 4:10 PM To: [EMAIL PROTECTED] Subject: URGENT! really low performance. Hi all, i have a problem, we have a z800, the configuration is: 1 cp 80 MIPS 1 IFL 8 Gb storage 3 partitions: -os/390 2.6 -os/390 2.6 -z/vm 4.3 840 gb (shark) the cp is dedicated to both os/390, and the ifl to z/vm, 2gb to both os/390, and 6 gb to z/vm. Redhat 7.2 as a z/vm guest: [root@linux1 root]# uname -a Linux linux1.xxx.xxx.xxx 2.4.9-38lvm #1 SMP mii feb 12 12:25:01 CST 2003 s390 unknown [root@linux1 s390]# cat /proc/cpuinfo vendor_id : IBM/S390 # processors : 1 bogomips per cpu: 630.78 processor 0: version = FF, identification = 02900A, machine = 2066 [root@linux1 s390]# cat /proc/meminfo total: used: free: shared: buffers: cached: Mem: 1045737472 364187648 681549824 0 15532032 317743104 Swap: 409821184 0 409821184 Default installation, the z/vm has one week installed: q cplevel z/VM Version 4 Release 3.0, service level 0201 (64-bit) Generated at 05/09/02 17:30:26 EST IPL at 02/07/03 12:13:53 EST when we make a tar -gzipping it- from a directory with 100Mb, we have that: -the hmc indicates that the ifl is at 99% utilization. -real time monitor indicates that the processor is at 99% utilization: | <USERID> %CPU %CP %EM ISEC PAG WSS RES UR PGES SHARE VMSIZE TYP,CHR,STAT | | LINUX1 99 .15 99 4.4 .00 100K 100K .0 1 50%A 1G VUS,QDS,DISP | | SYSTEM .08 .08 .00 .00 .00 0 5060 .0 536 ..... 2G SYS, | | VMRTM .02 .01 .01 .63 .00 462 483 .0 0 3%A 32M VUS,IAB,SIMW | -"top" at the linux shows: 30 processes: 27 sleeping, 3 running, 0 zombie, 0 stopped CPU states: 97.6% user, 2.3% system, 0.0% nice, 0.0% idle Mem: 1021228K av, 279636K used, 741592K free, 0K shrd, 14120K buff Swap: 400216K av, 0K used, 400216K free 234992K cached we apply some performance related commands like: set quickdsp linux1 on real set share linux1 relative 300 real set share linux1 absolute 50% real and the time went from 1m3.6s to 1m2.039s in the better case, the people from ibm (they are here yet) can give me an answer about the poor performance (i consider that its a poor performance, because a intel piii 128Mb RAM make the tar in about 28s), so i really dont know if this is the real performance of linux under vm, if we are doing something wrong, or what, when we bought the z800 they said that with this configuration we will be able to run about 200 virtual machinnes, maybe thats a fairly dream? Please, i accept any comments, sugestions, or anything that can help us. Thanks. -- Alejandro Leyva Rabinovich. Jefe de la Unidad Departamental de Soporte Ticnico (Administracisn de Mainframe). Direccisn General de Informatica. Secretarma de Finanzas. Gobierno del Distrito Federal.
