Hi all, Just a quick repost of v2[1] with a small fix for the bug reported by Nate. To recap, whilst this mostly only improves worst-case performance, those worst-cases have a tendency to be pathologically bad:
Ard reports general desktop performance with Chromium on AMD Seattle going from ~1-2FPS to perfectly usable. Leizhen reports gigabit ethernet throughput going from ~6.5Mbit/s to line speed. I also inadvertantly found that the HiSilicon hns_dsaf driver was taking ~35s to probe simply becuase of the number of DMA buffers it maps on startup (perf shows around 76% of that was spent under the lock in alloc_iova()). With this series applied it takes a mere ~1s, mostly of unrelated mdelay()s, with alloc_iova() entirely lost in the noise. Robin. [1] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg19139.html Robin Murphy (1): iommu/iova: Extend rbtree node caching Zhen Lei (3): iommu/iova: Optimise rbtree searching iommu/iova: Optimise the padding calculation iommu/iova: Make dma_32bit_pfn implicit drivers/gpu/drm/tegra/drm.c | 3 +- drivers/gpu/host1x/dev.c | 3 +- drivers/iommu/amd_iommu.c | 7 +-- drivers/iommu/dma-iommu.c | 18 +------ drivers/iommu/intel-iommu.c | 11 ++-- drivers/iommu/iova.c | 114 +++++++++++++++++---------------------- drivers/misc/mic/scif/scif_rma.c | 3 +- include/linux/iova.h | 8 +-- 8 files changed, 62 insertions(+), 105 deletions(-) -- 2.13.4.dirty
