Friday, December 06, 2013

OCNG 6200/6300 update

As announced, development of OCNG for 6200/6300 series Opterons started this week. Making progress already -- a little spoiler below: 6380 at 230 MHz refclock.

fah-002590582fd0:~$ sudo tpc -psmax 1
TurionPowerControl 0.44-rc2 (export)
Turion Power States Optimization and Control - by blackshard

fah-002590582fd0:~$ dmesg | grep Refined
[    4.150112] Refined TSC clocksource calibration: 2874.991 MHz.
fah-002590582fd0:~$ sudo tpc -l | grep 0.pstate.1 | head -1
core 0 pstate 1 (pb1) - En:1 VID:34 FID:12 DID:0.00 Freq:2800 VCore:1.1250
fah-002590582fd0:~$ sudo clockspeed
Clockspeed (OCNG4.5)
Family 15h
Turbo is supported. 2 boost state(s).
Running, please wait...
Refclock: 229.999 MHz
Clockspeed: 3216.071 MHz
fah-002590582fd0:~$ sudo dmidecode | grep -A4 Handle.0x0000
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: 3.0a
        Release Date: 02/01/2013

More information about this development can be found here.

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  1. So, with the OC, how does 6(2|3)00 stack up with PPD/W/$ vs Intel?

  2. At this time it's difficult to say -- comparison tests are planned for a later time.

    Generally, PPD/W gains will depend on your current configuration.

    If you're currently running -psmax 1 (forced all-core turbo) -- or if turbo is otherwise enabled, gains should be readily visible. With OCNG we'll be, effectively, "squeezing more juice" out of all-core turbo configuration, which is known to be "voltage-gifted".

    If you're currently running with turbo completely disabled, I'd expect smaller gains. Main benefit will be improved PPD "density" (more output from the same physical space).