From ae77cbc1e7b90473a2b0963bce0e1eb163873214 Mon Sep 17 00:00:00 2001 From: Ken Steele Date: Wed, 7 Aug 2013 12:39:56 -0400 Subject: 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 Signed-off-by: Chris Metcalf Signed-off-by: NeilBrown --- lib/raid6/test/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'lib/raid6/test') 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 *~ -- cgit v1.2.3