** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1744173
Title:
rfi-flush: Switch to new linear fallback flush
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Bug description:
[Impact]
Change flush method from "congruence-first with dependencies" to "linear with
no dependencies", which increases flush performance by 8x on P8, and
3x on P9. Measured with null syscall loop, which will have the flush area in
the L2 cache.
The flush also becomes simpler and more adaptable to different cache
geometries.
[Test Case]
TBD.
[Regression Potential]
The risk is deemed low since the changes are confined to POWER only and the
provided test kernels have been tested by IBM.
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