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From: Ricardo Galli <>
Subject: HELP: cpufreq on HT and/or SMP systems
Date: Thu, 31 Jul 2003 23:53:54 +0200	[thread overview]
Message-ID: <> (raw)

I have some doubts regarding cpufreq for SMP systems (for developing

If I remember well, I read a while ago that cpufreq didn't work in SMP 
systems, but reading the docs and kernel/cpufreq.c, it seems there should be 
any problem? 

Is it true?

OTH, I trying it on a P4 HT, and it works, changes in the frequency of one of 
the "cpu's",  changes both. 

What happens in the case of several real cpu's? Does it keep the same 
frequency for every cpu? According to a comment in cpufreq.c, it seems that 
each cpu might have different frequencies.

So, what's recommended? Change the frequency of every cpu one by one?


PS: sorry, I don't have any cpufreq/SMP machine at hand.

  ricardo galli       GPG id C8114D34

             reply	other threads:[~2003-07-31 21:54 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-31 21:53 Ricardo Galli [this message]
2003-08-01 22:36 ` HELP: cpufreq on HT and/or SMP systems Wes Felter
2003-08-01 22:51   ` Xavier Bestel
2003-08-01 23:01     ` Wes Felter
2003-08-05 11:16       ` Pavel Machek
2003-08-06  8:10         ` Dominik Brodowski

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