Section 2 – AIX Multiuser Performance (rPerf, POWER8 and up). CPW results of IBM Power Systems servers running the IBM i operating. rPerf is a computer benchmark that evaluates the relative OLTP performance of servers based on IBM POWER microprocessors. It is published by IBM and. Section 2a – AIX Multiuser Performance (rPerf, SPEC CPU, . All performance measurements for the IBM Power™ Systems, IBM.

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IBM did not publish any official information about piwer performance impact, neither how the security flaw was solved. Running industry benchmarks can be very expensive. Not sure if there is anyone in IT world who has not heard about latest vulnerabilities in the modern chips. Bart February 19, at In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point.

If your workload is better aligns with two threads per processor core, you should consider reducing the published POWER7 rPerf numbers by approximately 15 to 20 percent to get a more reasonable representation of its rPerf value. The graph looks very similar. Having this comprehensive set of information makes it easier to estimate the commercial workload CPU performance for any Power Systems server.

As you can see, there is almost the same utilization, no spectacular grow. He can be roerf at ccler forsythe. This has resulted in the publication of multiple rPerf values for each server based on varying processor core counts.


Email required Address never made public. Disk Flash Servers Software Tape. I had no performance impact once this fix get applied. Paul February 26, at I did a query — show me the jobs which consumed CPU the most. Martin February 19, at The main reason was to publish data rperr a broad selection of Power Systems servers. I will be giving updates in comming weeks. From information what we got so far, it looks that almost every modern chip which uses speculative processing is affected.

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More Articles From Charlie Cler. To find out more, including ivm to control cookies, see here: This tool collects statistics delivered by the HMC, which are the processor cycles dispatched by the Power Hypervisor. You are commenting using your Twitter account. There is almost no difference in CPU utilization.

Since IBM owns and controls the rPerf benchmark, it can report both actual and estimated data for Power servers.

Cover letter again is very mysterious. Patching is scheduled in waves. The first patch was delivered on January 9th. Note that rPerf can only be used for making comparisons within Power servers.

X We use ibbm to optimize your visit to our website. The amount of rPerfs required to run existing workloads can be determined and used to size new servers. Actually, in the OS V7R2 no performance degradation noted either. For workload migrations and server consolidation projects, rPerf data is frequently used for CPU sizing. Left graph before patches, right one with patches.


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If not, a server reboot is needed. Notify me of new comments via email.

If you would like to change your cookie settings at any time please view our privacy policy for additional information. We have carefully put this rper to test systems and closely monitored the performance. Do not forget that fixes for VIOSes were released as well.

IBM Power System CPW Performance Data: POWER8 vs. POWER9 ScaleOut Models

These requirements would make it extremely costly to publish multiple data points for each Power Systems model. Unfortunately, IBM is very conservative in published information regarding the vulnerability. I will try to update this post within next days, because last Friday Charlie Cler supports customers in a solutions-architect role at Forsythe Technology Inc.

The only way how to solve it, is to redesign the chip or patch the OS in the way that it will not allow to use this vulnerability.

IBM Power System CPW Performance Data: POWER8 vs. POWER9 ScaleOut Models | Arbor Solutions

Obm data is far away from precise capacity information, but I said before, this is the quickest way. Of course, I have no idea what these or those PTFs fixed. I just believe they did something.