diff options
| author | Timofey Titovets <[email protected]> | 2018-12-28 00:34:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-12-28 12:11:46 -0800 |
| commit | 59e1a2f4bf83744e748636415fde7d1e9f557e05 (patch) | |
| tree | cc25e2343b4d9be364d9fbd04de37a7326d796cd /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 0b9df58b79fa283fbedc0fb6a8e248599444bacc (diff) | |
ksm: replace jhash2 with xxhash
Replace jhash2 with xxhash.
Perf numbers:
Intel(R) Xeon(R) CPU E5-2420 v2 @ 2.20GHz
ksm: crc32c hash() 12081 MB/s
ksm: xxh64 hash() 8770 MB/s
ksm: xxh32 hash() 4529 MB/s
ksm: jhash2 hash() 1569 MB/s
Sioh Lee did some testing:
crc32c_intel: 1084.10ns
crc32c (no hardware acceleration): 7012.51ns
xxhash32: 2227.75ns
xxhash64: 1413.16ns
jhash2: 5128.30ns
As jhash2 always will be slower (for data size like PAGE_SIZE). Don't use
it in ksm at all.
Use only xxhash for now, because for using crc32c, cryptoapi must be
initialized first - that requires some tricky solution to work well in all
situations.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Timofey Titovets <[email protected]>
Signed-off-by: leesioh <[email protected]>
Reviewed-by: Pavel Tatashin <[email protected]>
Reviewed-by: Mike Rapoport <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions