A decent performance monitor (ESALPS comes to mind) will tell you exactly what
processes
are using the cpu and exactly how much. Have you considered running a decent
performance
monitor?
Kate Riggsby wrote:
Thank you all for sharing experiences and for advice. It gives me
hope there may be a way around my brick wall!
Rob, page-in is what this problem feels like. But
the lpar has 6G/2G of main/xstor and the total virtual storage
of all the guests together is 3264M, of which the problem linux guest
has 2G. VM reports 0 paging.
Just to clarify, there is one ifl on the z800. The lpar is running the
regular VM service machines, two small non-load-balanced linuxes
and then this problem instance. The linux I'm talking about
is load-balanced with five standalone (not on VM)
boxes. Our vm linux instance shouldn't be running a firewall
but it's another thing I should verify.
Mark, the lpar is running z/VM 5.2 at 0601. The linux guests are
running SLES9 SP3 (64bit). The system is using Performance Toolkit.
cat /proc/meminfo shows:
MemTotal: 2050128 kB LowFree: 343412 kB
MemFree: 343412 kB SwapTotal: 475852 kB
Buffers: 143588 kB SwapFree: 475852 kB
Cached: 1128868 kB Dirty: 444 kB
SwapCached: 0 kB Writeback: 0 kB
Active: 1035208 kB Mapped: 279544 kB
Inactive: 486132 kB Slab: 163204 kB
HighTotal: 0 kB Committed_AS: 2997492 kB
HighFree: 0 kB PageTables: 2496 kB
LowTotal: 2050128 kB VmallocTotal: 4292861952 kB
VmallocUsed: 2532 kB
VmallocChunk: 4292859180 kB
thanks,
kate
On 9/11/07, Rob van der Heij wrote:
Although you say there's enough real memory, it may be the system is
not configured correctly and still pages the Linux guests. Your
performance monitor should be able to provide more data than what you
mention in your post. You'd need to see whether it's indeed these two
Linux servers that consume the extra cycles, and if so, see which
processes are doing that in Linux. I would not expect that opening a
connecting on port 443 and ending it would cause a lot of CPU activity
(unless it triggers firewalls in Linux).
I think I read from your post that there's one IFL on the z800. That
means that you probably don't make things go faster by spreading the
load over multiple virtual machines (actually, you will make it
slower). The folks who came up with the model of probing port 443 may
have had a different failure model than what's applicable to running
two Linux virtual machines on the same z/VM (but I also know that such
sometimes is a nasty fight).
Rob
--
Rob van der Heij
----------------------------------------------------------------------
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
begin:vcard
fn:Barton Robinson
n:Robinson;Barton
adr;dom:;;PO 390640;Mountain View;CA;94039-0640
email;internet:[EMAIL PROTECTED]
title:Sr. Architect
tel;work:650-964-8867
note:If you can't measure it, I'm just not interested
x-mozilla-html:FALSE
url:http://velocitysoftware.com
version:2.1
end:vcard
