Messages in this thread | | | From | Paul Mackerras <> | Date | Thu, 23 Aug 2001 22:31:20 +1000 (EST) | Subject | Re: [PATCH] (comments requested) adding finer-grained timing to PPC add_timer_randomness() |
| |
Gabriel Paubert writes:
> Reading the PVR is probably faster in this case, since you avoid a > potential cache miss.
Yep.
> As I said in an earlier message the __USE_RTC macro > should be made dependent on whether the kernel supports 601 or not.
We don't have USE_RTC in 2.2. The proposed patch was for 2.2.19.
> No, this is not what they are trying to capture. Furthermore the 7 LSB of > the decrementer on a 601 are not random (but they don't seem to be 0 > always despite the documentation) so you would have to shift the result
Don't you mean that the 7 LSB of RTCL aren't random and are supposed to be 0? The decrementer should decrement by 1 at a rate of 7.8125MHz and all the bits should be implemented.
Paul. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |