[Cake] Cake3 - source code and some questions

Toke Høiland-Jørgensen toke at toke.dk
Thu Apr 23 07:01:03 EDT 2015

Adrian Popescu <adriannnpopescu at gmail.com> writes:

> Thanks to your experiment and your statement regarding CPU load on
> your box during testing, I was able to fix the problem.


> It looks like this problem was being caused by power saving. Something
> changed between the older kernels and the newer ones. Changing the
> power saving settings in the BIOS brings back latency below 0.5
> milliseconds.

So is this the PCI bus power saving settings, or the CPU, or?

> This might have an impact some benchmarks which don't load up all CPU
> cores or which don't need a lot of CPU power. This is certainly
> something to keep an eye on when doing any kind of testing involving
> really low latencies or network schedulers.

Yes, definitely. Having things be worse during idle is definitely not
optimal. I wonder if there's a kernel-level setting that can affect this?


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