BogoMIPS change in 3.6+
Rob Herring
robherring2 at gmail.com
Thu Jan 31 11:15:11 EST 2013
The BogoMIPS value has changed on highbank since the commit below in
3.6. It is now half the value it used to be. Does that matter other than
perception (I've checked that I'm not running at half the freq)?
Rob
commit d0a533b18235d36206b9b422efadb7cee444dfdb
Author: Will Deacon <will.deacon at arm.com>
Date: Fri Jul 6 15:47:17 2012 +0100
ARM: 7452/1: delay: allow timer-based delay implementation to be
selected
This patch allows a timer-based delay implementation to be selected by
switching the delay routines over to use get_cycles, which is
implemented in terms of read_current_timer. This further allows us to
skip the loop calibration and have a consistent delay function in the
face of core frequency scaling.
To avoid the pain of dealing with memory-mapped counters, this
implementation uses the co-processor interface to the architected timers
when they are available. The previous loop-based implementation is
kept around for CPUs without the architected timers and we retain both
the maximum delay (2ms) and the corresponding conversion factors for
determining the number of loops required for a given interval. Since the
indirection of the timer routines will only work when called from C,
the sa1100 sleep routines are modified to branch to the loop-based delay
functions directly.
More information about the linux-arm-kernel
mailing list