From: K.R. Foley
Date: Tue Mar 21 2006 - 21:24:28 EST
Ingo Molnar wrote:
> * K.R. Foley <kr@xxxxxxxxxx> wrote:
>> I haven't had a chance to look into it yet but this combination brings
>> with it a significant latency regression, at least as measured by the
>> rtc histogram stuff.
> can you also measure it via rtc_wakeup, a'ka:
> chrt -f -p 98 `pidof 'IRQ 8'`
> ./rtc_wakeup -f 8192 -t 100000
> ? I have just tried it, and -rt4 looks pretty good on the latency front
> (with all debugging disabled).
Sorry I have been onsite and completely buried today. Am running an
initial test on both UP and SMP now with 2.6.16-rt1. UP doesn't look bad
at all. SMP on the other hand doesn't look so good. I will give -rt4 a
spin when these are done.
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