There is also the rt-timers from Ingo Molnar which can be downloaded as 
a patch sets from http://www.kernel.org/pub/linux/kernel/projects/rt/

Gary Stanley kirjoitti:
> At 10:02 AM 3/31/2008, Erik Southworth wrote:
>   
>> I don't know if that's a 64_bit issue or an AMD vs Intel issue. I've seen
>> some hosting sites claim they can guarantee 500fps using AMD based systems.
>> I think if the binary is compiled for AMD opteron and I use  opteron
>> hardware the bottle neck would be the kernel parameters compiled in. I'm
>> currently using an Athlon /proc which is not ideal for the Opteron binary.
>> It's just for testing some of the kernel builds I plan on testing. The fps
>> right now is only 150fps on stock kernel with HZ=300, but it is stable.
>>     
>
> FPS is calculated by measuring the differences between 2 
> gettimeofday() calls and multiplying it by, IIRC, 1000.
> gettimeofday() is sourced by whatever drives your clocks. TSC is very 
> fast, but skews. HPET is nice to have, ACPI is slow to read and the 
> 8254 is very very slow to read.
>
> Your best bet is to use HPET if your hardware supports it. If not, use TSC.
>
>
> -- Gary Stanley ([EMAIL PROTECTED] | [EMAIL PROTECTED])
>
> http://leaf.dragonflybsd.org/~gary
>
>
>
>
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