On 29/03/2012 22:44, Jim Kukunas wrote:
Based on xor_speed, the AVX implementation appears to be ~32% faster than the
SSE implementation on my i7 2600:
generic_sse: 15088.000 MB/sec
avx: 19936.000 MB/sec
I just noticed in my logs the other day (recent el5 kernel on a Core 2):
raid5: automatically using best checksumming function: generic_sse
generic_sse: 7805.000 MB/sec
raid5: using function: generic_sse (7805.000 MB/sec)
raid6: int64x1 2635 MB/s
raid6: int64x2 3208 MB/s
raid6: int64x4 3020 MB/s
raid6: int64x8 2519 MB/s
raid6: sse2x1 5099 MB/s
raid6: sse2x2 5742 MB/s
raid6: sse2x4 8237 MB/s
raid6: using algorithm sse2x4 (8237 MB/s)
I was just wondering how it's possible to do the RAID6 Q calculation
faster than the RAID5 XOR calculation - or am I reading this log excerpt
wrongly?
It's probably academic, since the machine this is running on only has a
maximum of about 4500 MB/s of memory throughput, and a lot of that would
be consumed sending data to disc in amongst the calculations being done.
Cheers,
John.
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
