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| author | Robin Murphy <robin.murphy@arm.com> | 2020-01-15 16:42:39 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-01-16 15:23:29 +0000 |
| commit | 5777eaed566a1d63e344d3dd8f2b5e33be20643e (patch) | |
| tree | 9bf4f13c0209f26135e66073760b297ba0cac0d9 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | 46cf053efec6a3a5f343fead837777efe8252a46 (diff) | |
arm64: Implement optimised checksum routine
Apparently there exist certain workloads which rely heavily on software
checksumming, for which the generic do_csum() implementation becomes a
significant bottleneck. Therefore let's give arm64 its own optimised
version - for ease of maintenance this foregoes assembly or intrisics,
and is thus not actually arm64-specific, but does rely heavily on C
idioms that translate well to the A64 ISA and the typical load/store
capabilities of most ARMv8 CPU cores.
The resulting increase in checksum throughput scales nicely with buffer
size, tending towards 4x for a small in-order core (Cortex-A53), and up
to 6x or more for an aggressive big core (Ampere eMAG).
Reported-by: Lingyan Huang <huanglingyan2@huawei.com>
Tested-by: Lingyan Huang <huanglingyan2@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions