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| author | Ken Steele <ken@tilera.com> | 2013-08-07 18:39:56 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2013-08-27 08:05:50 +0200 |
| commit | ae77cbc1e7b90473a2b0963bce0e1eb163873214 (patch) | |
| tree | 0d412c9c4932c59c8b495aa6214f98404849af60 /lib/raid6/test | |
| parent | md: fix safe_mode buglet. (diff) | |
| download | linux-ae77cbc1e7b90473a2b0963bce0e1eb163873214.tar.xz 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/test')
| -rw-r--r-- | lib/raid6/test/Makefile | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/raid6/test/Makefile b/lib/raid6/test/Makefile index 087332dbf8aa..78f89d807f4e 100644 --- a/lib/raid6/test/Makefile +++ b/lib/raid6/test/Makefile @@ -35,6 +35,9 @@ else OBJS += altivec1.o altivec2.o altivec4.o altivec8.o endif endif +ifeq ($(ARCH),tilegx) +OBJS += tilegx8.o +endif .c.o: $(CC) $(CFLAGS) -c -o $@ $< @@ -85,11 +88,15 @@ int16.c: int.uc ../unroll.awk int32.c: int.uc ../unroll.awk $(AWK) ../unroll.awk -vN=32 < int.uc > $@ +tilegx8.c: tilegx.uc ../unroll.awk + $(AWK) ../unroll.awk -vN=8 < tilegx.uc > $@ + tables.c: mktables ./mktables > tables.c clean: rm -f *.o *.a mktables mktables.c *.uc int*.c altivec*.c tables.c raid6test + rm -f tilegx*.c spotless: clean rm -f *~ |