Performance problem with the guest operating system

Hello gurus - I have one of the most unusual questions, I ran into a few time. Here it is:

I have a guest w2008R2 OS - installed in a 5.1 version of VM 7 vSpherer - which has an Emulex LPe 12002-E 8 GB dual HBA port is assigned to the as 2 PCI (1 device per port) via DirectPath devices

The guest operating system has an application that performs backup tests. WWPN of the HBA is zoned in the fabric and declared in the interface of Compellent Storage Center and everything is good here. the application creates a replay of a volume, mount it as a drive, read all the blocks, then dismantles and moves then repeat the process with what ever additional volumes should be safeguarded. It is so cool I have do this with a VM right and not a physical host? (would be cool if I had work NPIV but that's another story, not with technology HBA vendor support...)

So, what's the problem? Well, the bed the mounted disk backup will work extremely slow as slow as 5MB\sec flow, then during any other activity takes place on the system the flow jumps up to 150MB\sec all of a sudden and will continue to run fast for a long time and finish jobs on time with each work taking a little more than an hour. But when the slow going the same work (all jobs are the same, they are simply by reading all the blocks of a bunch of 200 GB volumes and wrote a set of NULL value, do not forget this is just test) takes up to 10 hours to complete.

I think that what is the culprit? POWER MANAGEMENT.

I have just about each performance counter and the journal of events known to man and I don't see anything abnormal on the table, ESXi virtual machine, nothing. But what I see in the newspapers is any kind of activity that could happen in a transparent manner to save energy.

FACTS on this case:

-Reservation of memory is defined (it must be for directpath otherwise, you can't power on the virtual machine)

-Booking CPU - has not been defined before an hour ago, I gave her just a small reserve for this rule, so I do not know if this will help alleviate the slow flow, or have an effect on what I think is a question of power (unit linked) management

-windows power management is set to high performance never-ever - but not until an hour there doesn't I changed advanced settings for USB Disabled------turned off. PCI peripheral energy saving setting was already off. Which is in contradiction with my theory. But maybe, just maybe, something is broken somewhere, or could be a bug... blah blah blah

-the HBA, Emulex, as it appears in Device Manager in the guest OS doesn't have a power management tab to disable the feature, I don't see that the adapter VMXNET3 had this tab, and I turn off the power save setting to be conservative, do not think that it was the culprit, but as there is no real data running through the NIC. The data is simply to be read from the disk mounted, not copied on any wire Ethernet. never the less, in the Emulex properties is a Details tab and a selection of power data, and performance data indicate you what power mode, the device is, as well as feeding supported systems. D0: full power, but D3, which shows as supported by the device, is an energy saving mode. I could not yet attend the setting at the time of slow activity, my good intention as soon as possible. He is currently shooting in D0, full power.

This is so what I have to offer on this, I hope that its just... If I'm missing something, or if others have experienced this massive loss of unknown flow without reason and have resolutions, please share.

If there is a way for me to disable power on the Emulex HBA management inform you please, I don't mind if I stop to enter the firmware, if that was even possible. But if possible I would disable it immediately before any new tests are executed.

The root cause of this issue has never been identified by VMware support which for me is a question of ugly. Reservation of CPU for the VM using directpath IO with HBA installed in it corrected the problem. I'd be leary with direct path IO.

Tags: VMware

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http://KB.VMware.com/kb/1003638

If you believe this or any other answer was helpful please consider marking as 'correct' or 'useful '.

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---

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____________

Blog: LucD notes

Twitter: lucd22

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Performance problem with the guest operating system

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