On 06/12/2019 21:38, Cong Wang wrote:
This patchset contains three small optimizations for the global spinlock
contention in IOVA cache. Our memcache perf test shows this reduced its
p999 latency down by 45% on AMD when IOMMU is enabled.
Cong Wang (3):
iommu: avoid unnecessary magazine allocations
iommu: optimize iova_magazine_free_pfns()
iommu: avoid taking iova_rbtree_lock twice
---
drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------
1 file changed, 45 insertions(+), 30 deletions(-)
I retested, and got a ~1.1% gain in throughput for my storage test -
results here if interested https://pastebin.com/dSQxYpN8
Thanks,
John
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
