* cpuidle broken on mainline
@ 2016-06-22 15:16 Anton Blanchard
2016-06-22 19:39 ` Shreyas B Prabhu
0 siblings, 1 reply; 2+ messages in thread
From: Anton Blanchard @ 2016-06-22 15:16 UTC (permalink / raw)
To: shreyas, ego, mpe, mikey, Paul Mackerras, Benjamin Herrenschmidt
Cc: linuxppc-dev
Hi,
I was noticing some pretty big run to run variations on single threaded
benchmarks, and I've isolated it cpuidle issues. If I look at
the cpuidle tracepoint, I notice we only go into the snooze state.
Do we have any known bugs in cpuidle at the moment?
While looking around, I also noticed PM_QOS_CPU_DMA_LATENCY,
which seems like a bad thing for us. It is used in places like
the e1000e adapter:
drivers/net/ethernet/intel/e1000e/netdev.c:
pm_qos_add_request(&adapter->pm_qos_req, PM_QOS_CPU_DMA_LATENCY
Seems like that would force us into SMT8 mode all the time. Can we
disable it on ppc64le completely?
Anton
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: cpuidle broken on mainline
2016-06-22 15:16 cpuidle broken on mainline Anton Blanchard
@ 2016-06-22 19:39 ` Shreyas B Prabhu
0 siblings, 0 replies; 2+ messages in thread
From: Shreyas B Prabhu @ 2016-06-22 19:39 UTC (permalink / raw)
To: Anton Blanchard, ego, mpe, mikey, Paul Mackerras,
Benjamin Herrenschmidt
Cc: linuxppc-dev
Hi,
On 06/22/2016 08:46 PM, Anton Blanchard wrote:
> Hi,
>
> I was noticing some pretty big run to run variations on single threaded
> benchmarks, and I've isolated it cpuidle issues. If I look at
> the cpuidle tracepoint, I notice we only go into the snooze state.
>
> Do we have any known bugs in cpuidle at the moment?
>
I've posted a fix here-
https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-June/144726.html
Thanks,
Shreyas
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