Excessive users (21.5) in Queue 0.
Using QUICKDSP indiscriminately nulls the
scheduler to control thrashing.
If running Linux, SET SRM STORBUF instead.
>Date: Fri, 3 Dec 2004 09:15:12 -0600
>From: "Little, Chris" <[EMAIL PROTECTED]>
>Subject: Re: Lin
lf Of
David Kreuter
Sent: Friday, December 03, 2004 7:37 AM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
I too deal with this all the time. Many Pof C's consist of clients
dumping PC server workload exactly as is into linux virtual machines.
Not going to be kind to a "Z" box
On Fri, 03 Dec 2004 10:37:12 -0500, David Kreuter
<[EMAIL PROTECTED]> wrote:
> linux. Watch out: if "Z" P of C's are done improperly we will lose many
> opportunities to get linux on VM shops up running and stable - with
> acceptable performance and costs.
We're just in the front lines with zSeri
I too deal with this all the time. Many Pof C's consist of clients
dumping PC server workload exactly as is into linux virtual machines.
Not going to be kind to a "Z" box.
When I ask for "Z" performance data or PC and SUN server data I usually
get a blank stare. One client that is having major perf
On Thu, 2 Dec 2004 20:52:31 -0500, Post, Mark K <[EMAIL PROTECTED]> wrote:
> some people don't yet have enough backing from management to do that. Too
> many people keep hearing that Linux is free (instead of Free), and they
> don't understand why it gets so expensive. Of course, doing things th
--Original Message-
From: Post, Mark K [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 02, 2004 7:53 PM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
Barton,
You're absolutely right. Without data, all anyone can do is guess. I
suspect the problem a lot of people are facing is
, 2004 4:27 PM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
I really DO hate to bring this up, but
It really does solve a lot of mysteries to have a performance
monitor that collects your linux and VM data.
Right now, i'm looking at some SAP data, Linux on z/VM,
a big linux server logs
gt;Brad Johnson
>Sent: Wednesday, December 01, 2004 08:42
>Subject: Linux Slowdown
>
>
>Has anyone seen where the Linux Guests under VM just slow
>working from a network perspective and then it will work fine.
>During the time when the IP network connectivity fails, I have
>
I am experiencing the same thing. Its like the guests is not being dispatched.
Very strange.
-Cameron
-Original Message-
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
Brad Johnson
Sent: Wednesday, December 01, 2004 08:42
To: [EMAIL PROTECTED]
Subject: Linux Slowdown
Has
A few comments on QUICKDSP; some opinion, some fact.
I tend to look at QUICKDSP in three lights:
1. As Barton mentioned any guest/server that another
guest depends on. He once used the phrase 'anything that
is an extension of the operating system (VM)' should have
quickdsp. Network, secur
On Thursday, 12/02/2004 at 10:02 CET, Rob van der Heij <[EMAIL PROTECTED]>
wrote:
> I also am reluctant to give QUICKDSP to virtual machines that might
> consume a fair amount of resources. You'd let someone get in front of
> the line only when you know he only has something small to do, i.e. it
>
On Wed, Dec 01, 2004 at 03:38:28PM -0600, Little, Chris wrote:
> We have the following guests set to QUICKDSP
> REXECD (probably don't need it. we don't use rexec on the vm side)
If you don't use it, it DEFINITELY doesn't need QUICKDSP.
> FTPSERVE (ditto? do, but rarely)
> VMSERVR
> VMSERVS
>
I also am reluctant to give QUICKDSP to virtual machines that might
consume a fair amount of resources. You'd let someone get in front of
the line only when you know he only has something small to do, i.e. it
will not increase your wait time too much. We know that SFS servers
sometimes can eat a CP
erm.
David Kreuter
From: Linux on 390 Port on behalf of Little, Chris
Sent: Wed 12/1/2004 4:38 PM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
We have the following guests set to QUICKDSP
REXECD (probably don't need it. we don't use rexec on t
s all important . . . depending on who you
ask)
-Original Message-
From: Adam Thornton [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 01, 2004 1:44 PM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
On Dec 1, 2004, at 12:20 PM, Little, Chris wrote:
> What about a mission critical guest? We
On Dec 1, 2004, at 12:20 PM, Little, Chris wrote:
What about a mission critical guest? We have QUICKDSP set to ON for
our
primary database server. We _want_ it to work at the expense of
everything
else. If things get tight, that guest should not suffer.
OK, then, but it's a slippery slope; you a
Sent by: Linux on [EMAIL PROTECTED]
390 Port cc
<[EMAIL PROTECTED]
IST.EDU> Subject
Re: [LINUX-390] Linux Slowdown
12/01/2004 02:29
;should not suffer.
>
>-Original Message-
>From: Adam Thornton [mailto:[EMAIL PROTECTED]
>Sent: Wednesday, December 01, 2004 10:49 AM
>To: [EMAIL PROTECTED]
>Subject: Re: Linux Slowdown
>
>
>On Dec 1, 2004, at 9:59 AM, Mike Riggs wrote:
>
>> Should QUICKDSP be
, December 01, 2004 10:49 AM
To: [EMAIL PROTECTED]
Subject: Re: Linux Slowdown
On Dec 1, 2004, at 9:59 AM, Mike Riggs wrote:
> Should QUICKDSP be set ON for the LINUX guests under VM?
>
Not in general.
It may help a particular guest, but it does so at the expense of
everyone else, and bas
On Dec 1, 2004, at 9:59 AM, Mike Riggs wrote:
Should QUICKDSP be set ON for the LINUX guests under VM?
Not in general.
It may help a particular guest, but it does so at the expense of
everyone else, and basically you're patching a symptom rather than
fixing the underlying problem.
Adam
On Dec 1, 2004, at 9:42 AM, Brad Johnson wrote:
Has anyone seen where the Linux Guests under VM just slow working from
a
network perspective and then it will work fine. During the time when
the
IP network connectivity fails, I have consoled in via tn3270 and the
console just freezes. It will then
upgrade.
> -Original Message-
> From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
> Ward, Garry
> Sent: Wednesday, December 01, 2004 10:48 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [LINUX-390] Linux Slowdown
>
>
> Some in the past have found that t
n [EMAIL PROTECTED]
390 Port cc
<[EMAIL PROTECTED]
IST.EDU> Subject
Re: Linux Slowdown
12/01/2004
You'd want to see in your performance monitor whether the guest landed
in the eligble list. That can easily happen when you have been adding
more Linux servers and not reviewed the tuning of z/VM paging
subsystem. When Linux is stuck there for a while, IP connections time
out.
When Linux is hung yo
Some in the past have found that the specific guest has moved into the
wrong dispatching queue under VM.
-Original Message-
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Brad Johnson
Sent: Wednesday, December 01, 2004 10:42 AM
To: [EMAIL PROTECTED]
Subject: Linux
Has anyone seen where the Linux Guests under VM just slow working from a
network perspective and then it will work fine. During the time when the
IP network connectivity fails, I have consoled in via tn3270 and the
console just freezes. It will then restore. It appears that the system is
going i
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