Hello All,
Can anyone help me understand what is the minimum Timer Granularity for
gBS->SetTimer
When i have written a callback with 50ms(milli seconds), The calls seems to
be taking a value close
to 50ms
In the 8254Timerdxe the following comments are given about timer ticks
//
// The PCAT 8253/8254 has an input clock at 1.193182 MHz and Timer 0 is
// initialized as a 16 bit free running counter that generates an
interrupt(IRQ0)
// each time the counter rolls over.
//
// 65536 counts
// ---------------- * 1,000,000 uS/S = 54925.4 uS = 549254 * 100 ns
// 1,193,182 Hz
//
// The default timer tick duration is set to 10 ms = 100000 100 ns units
//
Based on the above details on x86-IA64 architecture
54925.4uS would be close to 50ms(milli seconds)
Does it means minimum granularity is 50ms for a callback to get called. For
a 10ms callback i am not seeing
a callback getting called every 10ms
Can I use anyother Timer Mechanisms from chipset for a shorter callbacks
than 50ms to improve my IO repsonse of the device?
Please provide your inputs & suggestions.
Thanks
Ranga
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