Re: cpu stall and hyperthread

[Dong Liu <dliu.cn@gmail.com>]

Hi Carsten,

Thanks! I'll try to take a look at these systems.

Cheers!

Dong

On 7/5/12 6:48 PM, Carsten Emde wrote:
> Hi Dong,
>
>> I tried to disable CONFIG_RT_GROUP_SCHED, but I still got cpu stalls!
> Hmm, sorry. I hoped it would work.
>
>> Is there a recommended config for the RT patch?
> Not really. In the x86 distro case, we base everything on the distro
> configuration, e.g. using
> cp /boot/config-`uname -r` .config
>
> We then disable CONFIG_RT_GROUP_SCHED and CONFIG_DEBUG_STACKOVERFLOW,
> because they are known to cause trouble and long latencies,
> respectively. In addition, we enable diagnostics such a latency
> histograms. That's all.
>
> An alternative approach would be to select a QA farm system that is
> close to your hardware and distro and use the same settings on your
> system. A list of all farm systems sorted by distro is here ->
> https://www.osadl.org/?id=1070; clicking on the system name in the first
> row of this table will display its entire profile. This includes kernel
> parameter, hardware data and, of course, the kernel configuration.
> Sometimes, there is also a quilt series, in case we temporarily use
> off-tree patches that are on their way to mainline. Would be interesting
> to see whether your system also stalls when a configuration is used that
> is successful here.
>
> -Carsten.