diff options
| author | Romain Dolbeau <[email protected]> | 2016-10-21 19:55:49 +0200 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2016-10-21 10:55:49 -0700 |
| commit | 24cdeaf12e9e546621902449699fc6d664aeac2b (patch) | |
| tree | 12af696407ba15b157d591f44f23de6d5eee2882 /man/man5 | |
| parent | e4ffa98dcaf2208c742609f0ab2bdb343071446a (diff) | |
Fletcher4 algorithm implemented in pure NEON for Aarch64 / ARMv8 64 bits
This is not useful on micro-architecture with a weak NEON
implementation (only 64 bits); the native version is slower &
the byteswap barely faster than scalar. On A53 or A57, it's
a small improvement on scalar but OK for byteswap.
Results from an A53 system:
0 0 0x01 -1 0 1499068294333000 1499101101878000
implementation native byteswap
scalar 1008227510 755880264
aarch64_neon 1198098720 1044818671
fastest aarch64_neon aarch64_neon
Results from a A57 system:
0 0 0x01 -1 0 4407214734807033 4407233933777404
implementation native byteswap
scalar 2302071241 1124873346
aarch64_neon 2542214946 2245570352
fastest aarch64_neon aarch64_neon
Reviewed-by: Gvozden Neskovic <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Romain Dolbeau <[email protected]>
Closes #5248
Diffstat (limited to 'man/man5')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index 932342cfd..95527906b 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -900,7 +900,7 @@ Default value: \fB67,108,864\fR. Select a fletcher 4 implementation. .sp Supported selectors are: \fBfastest\fR, \fBscalar\fR, \fBsse2\fR, \fBssse3\fR, -\fBavx2\fR, and \fBavx512f\fR. +\fBavx2\fR, \fBavx512f\fR, and \fBaarch64_neon\fR. All of the selectors except \fBfastest\fR and \fBscalar\fR require instruction set extensions to be available and will only appear if ZFS detects that they are present at runtime. If multiple implementations of fletcher 4 are available, |