* Posts by uarch

4 posts • joined 4 Dec 2009

Server virtualisation beyond the x86 environment


Fun Graphs

I absolutely love how they include "Not answered" and "don't use this platform" in the graphs to make it look as if only a tiny fraction of unix and other systems use virtualization.

I need to remember that trick.

IBM shows off Power7 HPC monster




Calm down. You're perfectly aware that's how they report the number to the press. You and I may not like it but that's the way they do it. I made a point of providing the breakdown of SMP, Mem, etc bandwidths because of this.

If you look back at your own comments you'll see that I was responding specifically to this comment of yours:

"However, IBM stated that the Power6 has 250GB/Sec bandwidth. And now, in this article it seems that Power7 has 100GB/sec bandwidth? Has the Power7 lower bandwidth than the Power6? Why is that?"

You, yourself, chose to compare the total aggregate Power6 bandwidth to only the memory bandwidth on Power7 and claimed the bandwidth from Power6 to Power7 was reduced. If you want to use the 250 GB/Sec figure for Power6 then you need to compare it to the 590 GB/Sec figure of Power7. If you want to use the 100 GB/Sec memory bandwidth for Power7 then you'll need to compare it to the same memory bandwidth figure for Power6 (you can Google it if you like, I kept finding the peak figure). You could also compare the peak memory bandwidths though those are less meaning full (50GB/sec for Power6 vs 180GB/sec for Power7 - according to a recent CNET article).

Whatever you do, you need to do an apples to apples comparison. Your previous comment compared an apple to the entire produce section.

"[...] That pisses me off. I dont mind if IBM's Power is faster, but I hate lies and FUD. [...]"

I understand your frustration but your passion for SUN's products is giving you a bad case of tunnel vision. Spreading even more FUD is not going to accomplish much. Both companies make good products and neither one is the perfect solution in every case. One is the right answer for some problems, the other is the right answer for another set of problems, some problems can be solved by both and some can't be solved well by either. Blindly screaming "SUN GOOD, IBM BAD" while misquoting figures and misinterpreting values accomplishes nothing.



In your rush to bad mouth the competition you've managed to confuse yourself w.r.t. the technical details. Please reread the article a bit more carefully.

If you look closely you'll see the 100GBps bandwidth you're quoting is only the memory bandwidth per chip. You're forgetting about I/O and the SMP network.

Take a moment and Google this year's Hot Chips presentations. According to what was presented, bandwidth for each Power7 chip:

Memory: 100 GBps

I/O: 50 GBps

SMP: 360 GBps

Total Bandwidth for a single Power7 chip: 590 GBps

Your posts contain several additional technical mistakes/misunderstandings but enough people have already jumped on your case over it, I won't pile on.

Pig plague alert: Avoid missionary position


New pickup line?

"Hey baby, lets go fight H1N1"


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