:My only worry here is laptops. : :If my laptop is connected to the wall-power when it boots it comes :up at full CPU speed during the probe and mask determination. : :Then I unplug it and the CPU speed drops by a large factor and :suddenly the mask is too tight for the CPU to get two samples. : :I think we need an approach where we loosen the mask at runtime if :some significant number of iterations fail to get a count may be :needed: : :#define N 25 : : static unsigned mask = 0xfffffffe; : : for (;;) { : for (i = 0; i < N; i++) { : c = READ_TIMER & mask; : d = READ_TIMER & mask; : if (c == d) : return(d); : } : printf("Adjusting mask to %08x\n", mask); : mask <<= 1; : } : :-- :Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
Ugh. Oh well. So much for the code being simple. I'll incorporate a similar change which adjusts the mask dynamically in both directions. -Matt Matthew Dillon <[EMAIL PROTECTED]> To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message