I recently wrote a blog article detailing Hyper-Threading (HT) and its effect on vSphere. An astute reader pointed out, a recent update to Project VRC’s terminal services analysis suggests disappointment with HT on vSphere. We spent a lot of time looking at those results to understand why they contradicted the body of performance data, which show HT offering 10-30% gain on vSphere. What we discovered led us to create a vSphere patch that would allow users to improve performance in some benchmarking environments.
vSphere 4.0, Hyper-Threading, and Terminal Services
March 17th, 2010 Posted in Uncategorized
Mar, 17 2010
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Hyper-Threading on vSphere
March 6th, 2010 Posted in Uncategorized
Mar, 06 2010
I continue to receive many questions from our customers on the expected performance gains of the new version of Hyper-Threading in Intel’s Core i7 processors. The answer requires a little bit of discussion on Hyper-Threading, a little bit on ESX, and comes with some performance data. If you are still interested, read on.
Four Things You Should Know About ESX 4's Scheduler
September 29th, 2009 Posted in Uncategorized
Sep, 29 2009
[This is the last re-post of old community content. But this content is important enough to be worth a re-post.]
I spend a great deal of time answering customers’ questions about the scheduler. Never have so many questions been asked about such an abstruse component for which so little user influence is possible. But CPU scheduling is central to system performance, so VMware strives to provide as much information on the subject as possible. In this blog entry, I want to point out a few nuggets of information on the CPU scheduler. These four bullets answer 95% of the questions I get asked.
Performance Troubleshooting: No PhD Required!
September 18th, 2009 Posted in Uncategorized
Sep, 18 2009
A couple of weeks ago at VMworld in San Francisco I squeezed a few press meetings in between the 19 sessions of the performance lab I led. In one of those meetings I talked with David Vellante and two of his colleagues to discuss vSphere performance and performance monitoring. David and company asked some hard questions about our performance work but my knowledge of this area runs deep, so the conversation was fruitful and interesting.
A few days after the conference a coworker of mine shared the following quote with me, courtesy of an article by David on Internet Evolution:
The fact is, most data center managers wouldn’t trust VMware to manage their Tier 1 applications because if something goes wrong performance-wise, you still need to roll in the VMware PhDs to solve it.
Let me respond to a few of the suggestions from this quote.
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