Unless you bought full speed processor, yes there is room for improvement. But the waits for data count toward your reduce CPU costs. I.E. a full speed CPU sees delays due to waiting, versus a slower processor counts those delays toward the reduced CPU speed.
On Wed, Jan 10, 2018 at 9:34 PM, Rugen, Len <[email protected]> wrote: > I wonder if the microcode has a little "detuning" so that if they ever have > to make patches that would slow down the system, they can remove a little of > the detuning to get back to base performance. > > > Len Rugen > > University of Missouri > Division of Information Technology > Systems & Operations - Metrics & Automation Team > ________________________________ > From: IBM Mainframe Discussion List <[email protected]> on behalf of > Mike Schwab <[email protected]> > Sent: Wednesday, January 10, 2018 8:55:07 PM > To: [email protected] > Subject: Re: System z & Meltdown/Spectre > > Yep. I know my site didn't purchase upgrades until running at 100% > all weekday long would slow down batch runs by 4X elapsed time > compared to 90%. > > On Wed, Jan 10, 2018 at 1:15 PM, Pommier, Rex <[email protected]> wrote: >> Gil, >> >> I don't think this one is necessarily a quality issue. As widespread as the >> problem is, it appears to me to be more of a huuuge oversight. That said, >> you are correct in that we don't know what IBM plans to do, or for that >> matter, even how much of an impact fixing this will be on performance of >> z/OS. My concern is that since we (as well as probably many of the sites on >> this board) are bumping against our cap and if we get hit by even a 10% >> reduction in thruput from this, we're in danger of missing SLAs and other >> fun TLAs. >> >> Rex >> >> -----Original Message----- >> From: IBM Mainframe Discussion List [mailto:[email protected]] On >> Behalf Of Paul Gilmartin >> Sent: Wednesday, January 10, 2018 11:52 AM >> To: [email protected] >> Subject: Re: System z & Meltdown/Spectre >> >> On Wed, 10 Jan 2018 17:31:37 +0000, Pommier, Rex wrote: >> >>>And what does "a significant CPU hit" mean for those of us who's 4HRA is >>>already at the top of our machine's capacity? That's where my concern is. >>>Yeah, the money for increasing MSUs is gonna stink, but missing SLAs due to >>>the box no longer being big enough is going to really bite. >>> >> There's a cynical suspicion that when a vendor sees defect repair as a >> profit center >> it provides a disincentive to quality. >> >> This might go a step beyond: "We did it wrong, so we'll raise the price to >> make it right." >> >> In fairness, we don't know what IBM plans to do. >> >> -- gil >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to [email protected] with the message: INFO IBM-MAIN >> >> >> The information contained in this message is confidential, protected from >> disclosure and may be legally privileged. If the reader of this message is >> not the intended recipient or an employee or agent responsible for >> delivering this message to the intended recipient, you are hereby notified >> that any disclosure, distribution, copying, or any action taken or action >> omitted in reliance on it, is strictly prohibited and may be unlawful. If >> you have received this communication in error, please notify us immediately >> by replying to this message and destroy the material in its entirety, >> whether in electronic or hard copy format. Thank you. >> >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to [email protected] with the message: INFO IBM-MAIN > > > > -- > Mike A Schwab, Springfield IL USA > Where do Forest Rangers go to get away from it all? > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
