Per core frequency control

2010-11-09 Thread David Naylor
Hi, I was reading through cpufreq(4) and in the bugs section it mentions that per core (or CPU) frequency control is not supported. That all cores/CPUs have to be at the same speed. What is the reason for that? Is it an infrastructure problem with FreeBSD or has it just not been

Re: Per core frequency control

2010-11-09 Thread Svein Skogen (Listmail account)
On 09.11.2010 11:56, David Naylor wrote: Hi, I was reading through cpufreq(4) and in the bugs section it mentions that per core (or CPU) frequency control is not supported. That all cores/CPUs have to be at the same speed. What is the reason for that? Is it an infrastructure

Re: Per core frequency control

2010-11-09 Thread David Brodbeck
On Tue, Nov 9, 2010 at 5:17 AM, Svein Skogen (Listmail account) svein-listm...@stillbilde.net wrote: You did read the symmetric part of symmetric multi processor didn't you? It's a limitation of the technology. One clock. I don't think that's quite true. The newer Intel server chipsets have

Re: Per core frequency control

2010-11-09 Thread Chuck Swiger
On Nov 9, 2010, at 9:54 AM, David Brodbeck wrote: On Tue, Nov 9, 2010 at 5:17 AM, Svein Skogen (Listmail account) svein-listm...@stillbilde.net wrote: You did read the symmetric part of symmetric multi processor didn't you? It's a limitation of the technology. One clock. I don't think

Re: Per core frequency control

2010-11-09 Thread Liontaur
On Tue, Nov 9, 2010 at 9:54 AM, David Brodbeck g...@gull.us wrote: On Tue, Nov 9, 2010 at 5:17 AM, Svein Skogen (Listmail account) svein-listm...@stillbilde.net wrote: You did read the symmetric part of symmetric multi processor didn't you? It's a limitation of the technology. One clock.