[lkml]   [2002]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: do_gettimeofday vs. rdtsc in the scheduler
   From: Alan Cox <>
Date: 17 Sep 2002 22:28:12 +0100

A bus clock - but things like the x440 have more than one bus clock. Its
NUMA. Also the bus clock and rdtsc clock are different - rdtsc is
dependant on the multiplier. Shove a celeron 300 and a celeron 450 in a
BP6 board with tsc on and enjoy

That's mostly my point.

If the bus clocks differ, then great create some system wide crystal
oscillator. That's a detail, the important bit is that you don't need
to go out to the system bus to read the tick value, it must be cpu
local to be effective and without serious performance impact.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:51    [W:0.103 / U:1.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site