Another test we ran yesterday where to tar (WITHOUT gzip, only tar) 100 Mb, we ran the test about 30 times, without modifing the enviroment, the 70-80% times we get about 1.4s, but 20-30% times the time vary from 2s to 8s, without any reason, then, the "specialist" from ibm told us that we must try with suse (kernel 2.2), because "maybe" the kernel from redhat have some problems.
what do you think? On Fri, 14 Feb 2003, Duff Sr., David wrote: > I meant to say 'if it is greater than 1ms then I would set it to 1ms'. > Sorry, the greater than symbol got lost.... > > > -----Original Message----- > > From: Duff Sr., David [mailto:[EMAIL PROTECTED]] > > Sent: Friday, February 14, 2003 9:13 AM > > To: [EMAIL PROTECTED] > > Subject: Re: URGENT! really low performance. > > > > > > Alex, > > > > I think that if it were me, I would first look to see what my > > dispatch minor > > time slice is. If it is 1ms then I would set it to 1ms and > > see if that is > > adequate. Second, and I am not sure if this is even someting > > that can be > > done in PRSM with an IFL on a z/800 (someone else on the list > > may know), I > > would (if possible) set wait completion to off to allow a > > higher degree of > > virtual machine interlace. And last, I think that I would remove the > > absolute settings that Linux has and let the VM > > scheduler/dispatcher do > > their marvelous work. I would do each of the above as > > separate steps and > > evaluate each after completion. > > > > :>)) > > > > > -----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. > > > > > > -- 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.
