Hi Victor,
We have used the statement "The hipervisor is busy". Sometimes it works :))
-Mike MacIsaac
On Fri, Apr 21, 2017 at 3:15 PM, Victor Echavarry Diaz <
[email protected]> wrote:
> Alan:
>
> The Unix group are asking for this. Because they see the steal alert, they
> want to know what is this happen. Is there a red book or presentation that
> talk about this so the Unix group understand this?
>
> Thanks,
>
> Victor Echavarry
> System Programmer
> Operating Systems
> EVERTEC, LLC
>
>
> -----Original Message-----
> From: Linux on 390 Port [mailto:[email protected]] On Behalf Of
> Alan Altmark
> Sent: Wednesday, April 19, 2017 5:48 PM
> To: [email protected]
> Subject: Re: High steal on z/linux guest
>
> On Wednesday, 04/19/2017 at 08:27 GMT, Victor Echavarry Diaz <
> [email protected]> wrote:
> > We are having issues with Linux guests that show high cpu steal when
> > the
> IFL's is not at full
> > capacity.
> >
> > Why this happening is system has IFL? How z/VM works with that? Some
> > of
> the guest with high steal
> > are Top Users. A guest under cluster do fencing
>
> I assert that users who consume a lot of CPU are more likely to notice
> that CPU time and wall clock time do not match. All virtualization
> platforms with shared CPU resources will have this issue. We're just
> better at measuring it. :-)
>
> I tell my clients:
> a) Stop running top. It wastes resources.
> b) If the application is running well, don't worry about it.
> c) Steal time doesn't tell you *why* the guest (or LPAR!) is not being
> dispatched, so you need to use z/VM performance data to find out why.
> d) If steal is steadily increasing, you might be adding workload faster
> than you are adding CPUs, or your LPAR weights are out of whack.
>
> Alan Altmark
>
> Senior Managing z/VM and Linux Consultant Lab Services System z Delivery
> Practice IBM Systems & Technology Group ibm.com/systems/services/
> labservices
> office: 607.429.3323
> mobile; 607.321.7556
> [email protected]
> IBM Endicott
>
> ----------------------------------------------------------------------
> 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 more information on Linux on System z, visit http://wiki.linuxvm.org/
>
> WARNING: This email and any files transmitted with it are confidential and
> intended solely for the use of the individual or entity to whom they are
> addressed. If you have received this email in error please delete it
> immediately.
> Please note that any views or opinions presented in this email are solely
> those
> of the author and do not necessarily represent those of EVERTEC, Inc. or
> its
> affiliates. Finally, the integrity and security of this message cannot be
> guaranteed on the Internet, and as such EVERTEC, Inc. and its affiliates
> accept
> no liability for any damage caused by any virus transmitted by this email.
>
> ----------------------------------------------------------------------
> 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 more information on Linux on System z, visit
> http://wiki.linuxvm.org/
>
--
-Mike MacIsaac
----------------------------------------------------------------------
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 more information on Linux on System z, visit
http://wiki.linuxvm.org/
