[dpdk-dev] [PATCH v2 03/12] crypto/armv8: Add core crypto operations for ARMv8
Thomas Monjalon
thomas.monjalon at 6wind.com
Tue Dec 6 22:42:51 CET 2016
2016-12-07 02:48, Jerin Jacob:
> On Tue, Dec 06, 2016 at 09:29:25PM +0100, Thomas Monjalon wrote:
> > 2016-12-06 18:32, zbigniew.bodek at caviumnetworks.com:
> > > From: Zbigniew Bodek <zbigniew.bodek at caviumnetworks.com>
> > >
> > > This patch adds core low-level crypto operations
> > > for ARMv8 processors. The assembly code is a base
> > > for an optimized PMD and is currently excluded
> > > from the build.
> >
> > It's a bit sad that you cannot achieve the same performance with
> > C code and a good compiler.
> > Have you tried it? How much is the difference?
>
> Like AES-NI on IA side(exposed as separate PMD in dpdk),
> armv8 has special dedicated instructions for crypto operation using SIMD.
> This patch is using the "dedicated" armv8 crypto instructions and SIMD
> operation to achieve better performance.
It does not justify to have all the code in asm.
> We had compared with openssl implementation.Here is the performance
> improvement for chained crypto operations case WRT openssl pmd
>
> Buffer
> Size(B) OPS(M) Throughput(Gbps)
> 64 729 % 742 %
> 128 577 % 592 %
> 256 483 % 476 %
> 512 336 % 351 %
> 768 300 % 286 %
> 1024 263 % 250 %
> 1280 225 % 229 %
> 1536 214 % 213 %
> 1792 186 % 203 %
> 2048 200 % 193 %
OK but what is the performance difference between this asm code
and a C equivalent?
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