Re: [Beowulf] cpufreq, multiple cores, load

2010-03-09 Thread Mark Hahn
2400MHz using the "ondemand" governor. The interesting thing, at least from my point of view, is how rapidly the power savings degrade as CPU load increases. well, one of the big themes in recent chip development is factoring out pieces that can be separately clocked. it's also true that the

Re: [Beowulf] Arima motherboards with SATA2 drives

2010-03-09 Thread Geoff Jacobs
David Mathog wrote: >> I'm assuming that the boffin Flextronics has handling legacy support for >> Arima is not being very responsive? > > If by "very" you mean "at all", then you would be accurate. > >> Well, editing the BIOS image for the mainboard seams kind of dodgy. > > That's what I ended

Re: [Beowulf] cpufreq, multiple cores, load

2010-03-09 Thread Bill Broadley
David Mathog wrote: > Starting a second cpuburn apparently schedules it > on one of the cores on the unused second processor, rather than > on the equally unused, but already sped up, second core on the first > CPU. Since that gives the most additional performance that seems a reasonable default.

[Beowulf] cpufreq, multiple cores, load

2010-03-09 Thread David Mathog
I am currently configuring a new (for us) dual Opteron 280 system. cpufreq works on this system, moving each pair of cores between 1000 and 2400MHz using the "ondemand" governor. The interesting thing, at least from my point of view, is how rapidly the power savings degrade as CPU load increases.

Re: [Beowulf] Arima motherboards with SATA2 drives

2010-03-09 Thread Geoff Jacobs
David Mathog wrote: > Have any of you seen a patched BIOS for the Arima HDAM* motherboards > that resolves the issue of the Sil 3114 SATA controller locking up when > it sees a SATA II disk? (Even a disk jumpered to Sata I speeds.) > Silicon Image released a BIOS fix for this, but since all of the