linux-kernel - x86: Enhance perf checksum profiling and x86 implementation

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Date:	Wed,  6 Nov 2013 10:23:17 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	linux-kernel@...r.kernel.org
Cc:	Neil Horman <nhorman@...driver.com>, sebastien.dugue@...l.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: x86: Enhance perf checksum profiling and x86 implementation

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@...a-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@...a-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@...driver.com>
CC: sebastien.dugue@...l.net
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: x86@...nel.org

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