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authorKen Steele <ken@tilera.com>2013-08-07 12:39:56 -0400
committerNeilBrown <neilb@suse.de>2013-08-27 16:05:50 +1000
commitae77cbc1e7b90473a2b0963bce0e1eb163873214 (patch)
tree0d412c9c4932c59c8b495aa6214f98404849af60 /lib/raid6/Makefile
parent275c51c4e34ed776d40a99dd97c1deee50303b07 (diff)
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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/Makefile')
-rw-r--r--lib/raid6/Makefile6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/raid6/Makefile b/lib/raid6/Makefile
index 9f7c184725d7..e5e90219d69e 100644
--- a/lib/raid6/Makefile
+++ b/lib/raid6/Makefile
@@ -5,6 +5,7 @@ raid6_pq-y += algos.o recov.o tables.o int1.o int2.o int4.o \
raid6_pq-$(CONFIG_X86) += recov_ssse3.o recov_avx2.o mmx.o sse1.o sse2.o avx2.o
raid6_pq-$(CONFIG_ALTIVEC) += altivec1.o altivec2.o altivec4.o altivec8.o
+raid6_pq-$(CONFIG_TILEGX) += tilegx8.o
hostprogs-y += mktables
@@ -70,6 +71,11 @@ $(obj)/altivec8.c: UNROLL := 8
$(obj)/altivec8.c: $(src)/altivec.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
+targets += tilegx8.c
+$(obj)/tilegx8.c: UNROLL := 8
+$(obj)/tilegx8.c: $(src)/tilegx.uc $(src)/unroll.awk FORCE
+ $(call if_changed,unroll)
+
quiet_cmd_mktable = TABLE $@
cmd_mktable = $(obj)/mktables > $@ || ( rm -f $@ && exit 1 )