Robin Murphy
bb65a64c72
iommu/dma: Plumb in the per-CPU IOVA caches
...
With IOVA allocation suitably tidied up, we are finally free to opt in
to the per-CPU caching mechanism. The caching alone can provide a modest
improvement over walking the rbtree for weedier systems (iperf3 shows
~10% more ethernet throughput on an ARM Juno r1 constrained to a single
650MHz Cortex-A53), but the real gain will be in sidestepping the rbtree
lock contention which larger ARM-based systems with lots of parallel I/O
are starting to feel the pain of.
Reviewed-by: Nate Watterson <nwatters@codeaurora.org >
Tested-by: Nate Watterson <nwatters@codeaurora.org >
Signed-off-by: Robin Murphy <robin.murphy@arm.com >
Signed-off-by: Joerg Roedel <jroedel@suse.de >
2017-04-03 12:45:03 +02:00
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