On Fri, May 1, 2009 at 9:25 PM, Tom Duerbusch
duerbus...@stlouiscity.com wrote:
Take a look at Overhead Deltas for VSE Releases which is page 5 of the
following PDF:
You're probably a bit confused about the overhead that OP was talking
about. The overhead deltas is the internal (additional) VSE
On Mon, May 4, 2009 at 9:43 AM, Rob van der Heij rvdh...@gmail.com wrote:
On Fri, May 1, 2009 at 9:25 PM, Tom Duerbusch
duerbus...@stlouiscity.com wrote:
Take a look at Overhead Deltas for VSE Releases which is page 5 of the
following PDF:
You're probably a bit confused about the overhead
2.3 doesn't have the Turbo dispatcher on by default.
So, only one engine is used. But when you turn on Turbo dispatcher, then you
also have additional overhead (per the foils).
I do wonder if the second level VM and the third level VSE have all processors
available to then (with turbo
-Original Message-
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Tom Duerbusch
Sent: Wednesday, April 29, 2009 11:42 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
And what are the inhibitors that prevent you from running VSE 2.3
directly under
discarded the idea to work in a second level VM the third level VSE
.
At the same time we migrated from ACF/2 to Top Secret in the VSE/ESA and
were ready to go for z/VSE.
We have half of the VSE´s in z/VSE 3.1 and stopped because the CPU incr
ease
from VSE 2.3 to zVSE 3.1 was between 15 and 20 percent
and then to
5.3.
We run in a 9672, z890 and now in a z9.
It is easy to upgrade VM releases, but we spent three years migrating
from
ACF/2 to Top Secret as directed ( forced ) by CA. This was the real
problem
but I discarded the idea to work in a second level VM the third level
VSE.
At the same time we
Hello listers,
Before I begin, yes I know third level will cost us. Since SIE doesn't ge
t
down to the VSE we do not benefit from that and all CPU has to be emulate
d.
We have moved an old VM/ESA 2.2 with VSE 2.3 to a new z890 machine.
Obviously this level of VM can't run on zseries so we have
Avoid privileged instructions, such as IO and paging. Here VM's
Minidisk cache can help to avoid I/O. You'd cache at the highest
level, that is use VSE caching as much as possible, then VM/ESA's;
you'd turn off MDC in z/VM, it is of no use to have two MDC levels.
Have you looked at a performance
Hello Kris,
The guest runs with attached DASD so MDC is not applicable in this case.
It doesn't look like IO is the problem here. But obviously any command
processed in the guest will cause double the load in the host VM. So I do
agree to avoid as much as possible. I don't know if MDC in the
:01
An: IBMVM@LISTSERV.UARK.EDU
Betreff: Re: Third level VSE
Hello Kris,
The guest runs with attached DASD so MDC is not applicable in this case.
It doesn't look like IO is the problem here. But obviously any command
processed in the guest will cause double the load in the host VM. So I do
agree
2009 12:01
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
Hello Kris,
The guest runs with attached DASD so MDC is not applicable in this case.
It doesn't look like IO is the problem here. But obviously any command
processed in the guest will cause double the load in the host VM. So I
Geert,
Do you mean: attached to the VSE-guest or to the VM/ESA-guest?
If attached to the VSE-guest: is there still a real performance benefit
in attaching dasd to a 3rd level VSE-guest?
Attached to the guest VM. I don't know if there would be any advantage in
attaching to third level, other
Only a subset of privileged instructions require intervention from VM
hence huge overhead for 3'th level VSE. MOVE kind instructions for
example would ran at native speed, no matter how deed the SIE
instruction is nested.
Driving IO is the most obvious area that require VM intervention.
Avoiding
...@listserv.uark.edu] On
Behalf Of Berry van Sleeuwen
Sent: woensdag 29 april 2009 13:51
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
Geert,
Do you mean: attached to the VSE-guest or to the VM/ESA-guest?
If attached to the VSE-guest: is there still a real performance benefit
in attaching
Berry van Sleeuwen wrote:
But would that also boost non-IO load? I expect the problem is CPU load in
some stupid program. In that case any MDC wouldn't help me for that. The
only advantage would be an improvement of the batch processing.
Then engage a performance monitor under VSE, or
On Wednesday, 04/29/2009 at 08:17 EDT, Kris Buelens
kris.buel...@gmail.com wrote:
Only a subset of privileged instructions require intervention from VM
hence huge overhead for 3'th level VSE. MOVE kind instructions for
example would ran at native speed, no matter how deed the SIE
instruction
: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Berry van Sleeuwen
Sent: woensdag 29 april 2009 13:51
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
Geert,
Do you mean: attached to the VSE-guest or to the VM/ESA-guest?
If attached to the VSE-guest
On Wed, Apr 29, 2009 at 2:49 PM, Alan Altmark alan_altm...@us.ibm.com wrote:
An unassisted SIE instruction is trapped by the underlying z/VM system and
trimmed to reflect what the underlying z/VM system knows about the guest
who issued the SIE. Then that underlying z/VM issues a SIE. With
And what are the inhibitors that prevent you from running VSE 2.3 directly
under z/VM 5.4?
I have VSE 2.3.2 running on z/VM 5.2 on a z/890. I've been toying with the
idea of upgrading VM this summer. Are there other products that are running
under VM/ESA 2.2 that need to be on the same VM
...@listserv.uark.edu] On
Behalf Of Tom Duerbusch
Sent: Wednesday, April 29, 2009 11:42 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
And what are the inhibitors that prevent you from running VSE 2.3
directly under z/VM 5.4?
I have VSE 2.3.2 running on z/VM 5.2 on a z/890. I've been
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Third level VSE
And what are the inhibitors that prevent you from running VSE 2.3
directly under z/VM 5.4?
I have VSE 2.3.2 running on z/VM 5.2 on a z/890. I've been toying with
the idea of upgrading VM this summer. Are there other products
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