From: Xiang Chen <[email protected]>
The series ("Optimizing iommu_[map/unmap] performance") improve the
iommu_[map/unmap] performance. Based on the series, implement [map/unmap]_pages
callbacks for ARM SMMUV3.
Use tool dma_map_benchmark to test the latency of map/unmap, and it promotes
much on it. The test result is as follows:
t = 1(thread = 1):
before opt(us) after opt(us)
g=1(4K size) 0.1/1.3 0.1/0.8
g=2(8K size) 0.2/1.5 0.2/0.9
g=4(16K size) 0.3/1.9 0.1/1.1
g=8(32K size) 0.5/2.7 0.2/1.4
g=16(64K size) 1.0/4.5 0.2/2.0
g=32(128K size) 1.8/7.9 0.2/3.3
g=64(256K size) 3.7/14.8 0.4/6.1
g=128(512K size) 7.1/14.7 0.5/10.4
g=256(1M size) 14.0/53.9 0.8/19.3
g=512(2M size) 0.2/0.9 0.2/0.9
g=1024(4M size) 0.5/1.5 0.4/1.0
t = 10(thread = 10):
before opt(us) after opt(us)
g=1(4K size) 0.3/7.0 0.1/5.8
g=2(8K size) 0.4/6.7 0.3/6.0
g=4(16K size) 0.5/6.3 0.3/5.6
g=8(32K size) 0.5/8.3 0.2/6.3
g=16(64K size) 1.0/17.3 0.3/12.4
g=32(128K size) 1.8/36.0 0.2/24.2
g=64(256K size) 4.3/67.2 1.2/46.4
g=128(512K size) 7.8/93.7 1.3/94.2
g=256(1M size) 14.7/280.8 1.8/191.5
g=512(2M size) 3.6/3.2 1.5/2.5
g=1024(4M size) 2.0/3.1 1.8/2.6
Xiang Chen (2):
iommu/arm-smmu-v3: Implement the unmap_pages() IOMMU driver callback
iommu/arm-smmu-v3: Implement the map_pages() IOMMU driver callback
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
--
2.8.1
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