[PlanetCCRMA] 3ms latency in ccrma kernel

Nils nils.tonnaett at posteo.de
Fri Apr 22 01:52:16 PDT 2016

Yesterday I installed another realtime kernel from https://copr.fedorai
nfracloud.org/coprs/jkastner/Fedora-Realtime/packages/. There has to be
a difference in configuration or a bug that gives me over 3 ms latency
with the ccrma kernel. With kastner's kernel the latency is under

-- Nils

Am Mittwoch, den 20.04.2016, 15:37 +0200 schrieb
ycollette.nospam at free.fr:
> On my PC, which is AMD based and has a Radeon graphic card, the RT
> kernel is almost unusable because of the latency problems.
> ----- Mail original -----
> De: "Nils" <nils.tonnaett at posteo.de>
> À: planetccrma at ccrma.Stanford.EDU
> Envoyé: Mercredi 20 Avril 2016 14:57:01
> Objet: [PlanetCCRMA] hwlat_detector module
> Hello everybody,
> is there a reason that there is no hwlat_detector module compiled for
> the ccrma rt kernel? Maybe it could be enabled for the kernel. I
> would
> like to find the reason why my Thinkpad E530 has latencies above 3ms.
> I
> tried disabling c-states and rc6-states, disabling dedicated nvidia
> graphics, disabling wifi and a lot of other things. The high
> latencies
> occur (maybe always) when I move or maximize a window. The situation
> is
> better when I have an external monitor connected. Has someone
> experienced similar behaviour with lenovo laptops?
> -- Nils
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