Re: [PATCH] - Fix get_model_name() for mixed cpu type systems

Jack Steiner
2006-10-20T02:03:32Z

>
> While I was testing cpu-hotplug (2.6.18-git tree), mistakenly I hot-plugged
> different-frequency-cpu.
> Booted with : Itanium2 1.6GHz
> Hot-added : Itanium2 1.5GHz
>
> What happend was ...hrtimer delayed.
> timers based on jiffies (ex. select()) worked well but timer based on hrtimer
> can't work. For example, sleep(1) sleeps very long..
>
> Mixed-cpu system works well in other environment ?

FWIW, one of our primary test systems has:

CPU GEOID FAMILY MOD REV ARCH CPUFREQ ITCFREQ FSBFREQ L3-MB CORE THD NODE NASID SHUB PROM
0 001c05#0a Itanium2 1 5 0 1300 1300 400 3 0 0 0 0 1.2 4.70
1 001c05#0c Itanium2 1 5 0 1300 1300 400 3 0 0 0 0 1.2 4.70
2 001c05#1a Itanium2 1 5 0 1300 1300 400 3 0 0 1 2 1.2 4.70
...
21 001c34#0c Itanium2 1 5 0 1300 1300 325 3 0 0 14 28 1.1 4.70
22 001c34#1a Itanium2 1 5 0 1300 1300 325 3 0 0 15 30 1.1 4.70
23 001c34#1c Itanium2 1 5 0 1300 1300 400 3 0 0 15 30 1.1 4.70
24 002c11#0a Itanium2 2 2 0 1600 1600 400 6 0 0 16 32 1.2 4.70
25 002c11#0c Itanium2 2 2 0 1600 1600 400 6 0 0 16 32 1.2 4.70
26 002c11#1a Itanium2 2 2 0 1600 1600 426 6 0 0 17 34 1.2 4.70
...
31 002c14#1c Itanium2 2 2 0 1600 1600 426 6 0 0 19 38 1.2 4.70
32 002c17#0a Itanium2 2 2 0 1500 1500 400 4 0 0 20 40 1.2 4.70
33 002c17#0c Itanium2 2 2 0 1500 1500 400 4 0 0 20 40 1.2 4.70
34 002c17#1a Itanium2 2 2 0 1500 1500 461 4 0 0 21 42 1.2 4.70
35 002c17#1c Itanium2 2 2 0 1500 1500 666 4 0 0 21 42 1.2 4.70
36 002c27#0a Itanium2 2 2 0 1500 1500 666 4 0 0 22 44 1.2 4.70
...
40 003c11#0a Itanium2 0 7 0 900 900 400 1 0 0 24 48 1.1 4.70
41 003c11#0c Itanium2 0 7 0 900 900 400 1 0 0 24 48 1.1 4.70
42 003c11#1a Itanium2 0 7 0 900 900 400 1 0 0 25 50 1.1 4.70

I've never noticed a problem with normal operation. I have NOT tried hot-add.

-- jack