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| author |   Anton Blanchard <anton@samba.org> | 2016-07-01 08:19:45 +1000 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2016-07-05 23:05:19 +0800 |
| commit | 6dd7a82cc54ebd2936763befd3dcd4beb727a704 (patch) | |
| tree | 4077ad30a801a6e7dcc0b915612e2c815239fd9b /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | powerpc: define FUNC_START/FUNC_END (diff) | |
| download | linux-dev-6dd7a82cc54ebd2936763befd3dcd4beb727a704.tar.xz linux-dev-6dd7a82cc54ebd2936763befd3dcd4beb727a704.zip | |
crypto: powerpc - Add POWER8 optimised crc32c
Use the vector polynomial multiply-sum instructions in POWER8 to
speed up crc32c.
This is just over 41x faster than the slice-by-8 method that it
replaces. Measurements on a 4.1 GHz POWER8 show it sustaining
52 GiB/sec.
A simple btrfs write performance test:
dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096
sync
is over 3.7x faster.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions