[Skiboot] [PATCH] SLW: Increase stop4-5 residency by 10x

Stewart Smith stewart at linux.vnet.ibm.com
Fri Mar 23 16:43:57 AEDT 2018

Akshay Adiga <akshay.adiga at linux.vnet.ibm.com> writes:
> Using DGEMM benchmark we observed there was a drop of 5-9% throughput with
> and without stop4/5. In this benchmark the GPU waits on the cpu to wakeup
> and provide the subsequent data block to compute. The wakup latency
> accumulates over the run and shows up as a performance drop.
> Linux enters stop4/5 more aggressively for its wakeup latency. Increasing
> the residency from 1ms to 10ms makes the performance drop <1%
> Signed-off-by: Akshay Adiga <akshay.adiga at linux.vnet.ibm.com>
> ---
>  hw/slw.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Merged to master as of 87f33f4990612116306ab42fbd7c163a2f90c89c
Stewart Smith
OPAL Architect, IBM.

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