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SubjectRe: Help understanding slow down
Phy Prabab wrote:
> NO HT, disabled in bios and did not enable in kernel:
> cat /proc/cpuinfo|grep processor|wc -l
> 2
> grep SMT .config (2.6.7-rc1)
> # CONFIG_SCHED_SMT is not set
>
> On 2.4.21 I also include "append=noht"
>

OK good, that makes things simpler.

I'm out of ideas though. The kernel just doesn't seem to be
the problem here. Can you put together a testcase that causes
the problem and that we can download and reproduce it?

Otherwise, try to work out why your userspace processes are
more often idle under the 2.6 kernel.
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