Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)

[Ingo Oeser]

Hi Paul,

in short: NAK!

On Monday 02 June 2008, Paul Jackson wrote:
> (Aside to the RealTime folks -- is there a 'realtime'
> email list which I should include in this discussion?)
> 
> The kernel has a "isolcpus=" kernel boot time parameter.  This
> parameter isolates CPUs from scheduler load balancing, minimizing the
> impact of scheduler latencies on realtime tasks running on those CPUs.

I used it to mask out a defect CPU on a 8-CPU node of a 
HPC-cluster at a customer site, until the $BIG_VENDOR 
sent a replacement. And to prove $BIG_VENDOR, that we actually
have a problem on THAT CPU.

So I would really like to keep this fault isolation capability.
I made my customer happy with that.

I wish Linux had more such "mask out bad hardware" features
to faciliate fault isolation and boot and runtime.


Best Regards

Ingo Oeser
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