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Subjectx86: Enhance perf checksum profiling and x86 implementation
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Hey all-
Sorry for the delay here, but it took me a bit to get the perf bits
working to my satisfaction. As Ingo requested I added do_csum to the perf
benchmarking utility (as part of the mem suite, since it didn't seem right to
create its own suite). I've also revamped the do_csum routine to do some smart
prefetching, as it yielded slightly better performance over simple prefetching
at a fixed stride:

Without prefetch:
[root@rdma-dev-02 perf]# ./perf bench mem csum -r x86-64-csum -l 1500B -s 512MB
-i 1000000 -c
# Running mem/csum benchmark...
# Copying 1500B Bytes ...

0.955977 Cycle/Byte

With prefetch:
[root@rdma-dev-02 perf]# ./perf bench mem csum -r x86-64-csum -l 1500B -s 512MB
-i 1000000 -c
# Running mem/csum benchmark...
# Copying 1500B Bytes ...

0.922540 Cycle/Byte


About a 3% improvement.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: sebastien.dugue@bull.net
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: x86@kernel.org



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