* Slow AVX XOR reported
@ 2013-11-25 20:29 Larkin Lowrey
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From: Larkin Lowrey @ 2013-11-25 20:29 UTC (permalink / raw)
To: linux-raid
The AVX XOR performance reported during boot seems wrong.
raid6: using algorithm sse2x4 (10035 MB/s)
xor: automatically using best checksumming function:
avx : 3468.000 MB/sec
I would expect the value to be well north of 10000MB/s. I do not get a
generic_sse performance number which I do on other non-AVX hosts.
The system is a dual AMD Opteron 6378 (16 core, 2.4GHz, piledriver). The
kernel is 3.11.8-200.fc19.x86_64.
I did read that AMD's AVX-256 implementation performs poorly compared to
AVX-128. Perhaps there are other AMD specific "optimizations" that need
to be considered.
Is there any standalone code I ran run to benchmark the various XOR
implementations?
--Larkin
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2013-11-25 20:29 Slow AVX XOR reported Larkin Lowrey
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