> > 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 - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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