I see your point. There are only two machines with 512M and up - one at
512M and the other at 700M. Four of the Linux machines have 128M and the
rest are 56M linux routers.
We are slated for a z800 in August. Since it comes with 8 gig (I think)
and our current OS/390 test and prod lpars only use 2.5 (and rarely use it
all) I should be set for memory. *And, we're talking about adding another
IFL into the mix. I still hope that IBM's VM/Linux system, which I have
bought into fully, benefits from some of IBM's stellar R&D teams.
Matt Lashley
Idaho State Controller's Office
"What I believe, I believe seriously. In that manner, all things
contrasting, I must question."
Jim Sibley
<[EMAIL PROTECTED] To: [EMAIL PROTECTED]
com> cc:
Sent by: Linux on Subject: Re: offloading CPU intensive
loads from zLinux to cheaper pastures
390 Port
<[EMAIL PROTECTED]
IST.EDU>
06/19/2003 10:40
AM
Please respond to
Linux on 390 Port
With 1 Gig of real memory and 512 MB per guest, you're probably measuring
the VM paging subsystem or some other overhead phenonmena, which is
probably tunable, not the Linux guest. - with 10x512 MB guest to 1 GB real
memory, you may be overcommited by more than 5 to 1 because VM chews up a
good bit of that memory too! The miracle would probaly be to do something
like add more memory.
I'd tried your perl_bench on an LPAR on a 9672 (G6) and a guest on a 2064
(z116)and the results were very consistent (though I did change the 2nd
loop to 10000).
SLES8 with SP2 applied
IFL
2 GB memory
9672 bogomips 634.06 (G6)
time ./perl_bench
real 11.7-11.8s
user 11.7-11.8s
sys 0.010s
EC guest
non-IFL
SLES8 with SP2 applied
512 GB guest memory/ 24 GB VM memory
2064 bogomips 776.6 (z1 - 116)
time ./perl_bench
real 9.6s
user 9.6s
sys 0.0s
It both cases, the results repeated with a deviation around 1%.
Regards, Jim
Linux S/390-zSeries Support, SEEL, IBM Silicon Valley Labs
t/l 543-4021, 408-463-4021, [EMAIL PROTECTED]
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