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| author | Ken Steele <ken@tilera.com> | 2013-08-07 12:39:56 -0400 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2013-08-27 16:05:50 +1000 |
| commit | ae77cbc1e7b90473a2b0963bce0e1eb163873214 (patch) | |
| tree | 0d412c9c4932c59c8b495aa6214f98404849af60 /lib/raid6/algos.c | |
| parent | 275c51c4e34ed776d40a99dd97c1deee50303b07 (diff) | |
| download | linux-ae77cbc1e7b90473a2b0963bce0e1eb163873214.tar.gz linux-ae77cbc1e7b90473a2b0963bce0e1eb163873214.tar.bz2 linux-ae77cbc1e7b90473a2b0963bce0e1eb163873214.zip | |
RAID: add tilegx SIMD implementation of raid6
This change adds TILE-Gx SIMD instructions to the software raid
(md), modeling the Altivec implementation. This is only for Syndrome
generation; there is more that could be done to improve recovery,
as in the recent Intel SSE3 recovery implementation.
The code unrolls 8 times; this turns out to be the best on tilegx
hardware among the set 1, 2, 4, 8 or 16. The code reads one
cache-line of data from each disk, stores P and Q then goes to the
next cache-line.
The test code in sys/linux/lib/raid6/test reports 2008 MB/s data
read rate for syndrome generation using 18 disks (16 data and 2
parity). It was 1512 MB/s before this SIMD optimizations. This is
running on 1 core with all the data in cache.
This is based on the paper The Mathematics of RAID-6.
(http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf).
Signed-off-by: Ken Steele <ken@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'lib/raid6/algos.c')
| -rw-r--r-- | lib/raid6/algos.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index 6d7316fe9f30..b9f340180a3b 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -66,6 +66,9 @@ const struct raid6_calls * const raid6_algos[] = { &raid6_altivec4, &raid6_altivec8, #endif +#if defined(CONFIG_TILEGX) + &raid6_tilegx8, +#endif &raid6_intx1, &raid6_intx2, &raid6_intx4, |