Messages in this thread | | | Date | Thu, 23 Jun 2005 00:04:28 +0200 | From | Ingo Molnar <> | Subject | Re: PREEMPT_RT vs I-PIPE: the numbers, part 2 |
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* Karim Yaghmour <karim@opersys.com> wrote:
> Ingo Molnar wrote: > > the UDP-over-localhost latency was a softirq processing bug that is > > fixed in current PREEMPT_RT patches. (real over-the-network latency was > > never impacted, that's why it wasnt noticed before.) > > That's good to hear, but here are some random stats from the idle run:
please retest using recent (i.e. today's) -RT kernels. There were a whole bunch of fixes that could affect these numbers. (But i'm sure you know very well that you cannot expect a fully-preemptible kernel to have zero runtime cost. In that sense, if you want to be fair, you should compare it to the SMP kernel, as total preemptability is a similar technological feat and has very similar parallelism constraints.)
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