From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Cc: zbigniew.bodek@caviumnetworks.com, dev@dpdk.org,
pablo.de.lara.guarch@intel.com,
Emery Davis <emery.davis@caviumnetworks.com>
Subject: Re: [dpdk-dev] [PATCH v2 03/12] crypto/armv8: Add core crypto operations for ARMv8
Date: Wed, 07 Dec 2016 16:00:07 +0100 [thread overview]
Message-ID: <2244872.kAKz40o8xq@xps13> (raw)
In-Reply-To: <20161206232437.GA26779@localhost.localdomain>
2016-12-07 04:54, Jerin Jacob:
> On Tue, Dec 06, 2016 at 02:41:01PM -0800, Thomas Monjalon wrote:
> > 2016-12-07 03:35, Jerin Jacob:
> > > On Tue, Dec 06, 2016 at 10:42:51PM +0100, Thomas Monjalon wrote:
> > > > 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@caviumnetworks.com:
> > > > > > > From: Zbigniew Bodek <zbigniew.bodek@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.
> > >
> > > Why ? if we can have separate dpdk pmd for AES-NI on IA . Why not for ARM?
> >
> > Jerin, you or me is not understanding the other.
> > It is perfectly fine to have a separate PMD.
> > I am just talking about the language C vs ASM.
>
> Hmm. Both are bit connected topic :-)
>
> If you check the AES-NI PMD installation guide, We need to download the
> "ASM" optimized AES-NI library and build with yasm.
> We all uses fine grained ASM code such work.
> So AES-NI case those are still ASM code but reside in some other
> library.
Yes
> http://dpdk.org/doc/guides/cryptodevs/aesni_mb.html(Check Installation section)
> https://downloadcenter.intel.com/download/22972
>
> Even linux kernel use, hardcore ASM for crypto work.
> https://github.com/torvalds/linux/blob/master/arch/arm/crypto/aes-ce-core.S
Yes
> > > > > 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?
> > >
> > > Do you you want compare against the scalar version of C code? its not
> > > even worth to think about it. The vector version will use
> > > dedicated armv8 instruction for crypto so its not portable anyway.
> > > We would like to asm code so that we can have better control on what we do
> > > and we cant rely compiler for that.
> >
> > No I'm talking about comparing a PMD written in C vs this one in ASM.
>
> Only fast stuff written in ASM. Remaining pmd is written in C.
> Look "crypto/armv8: add PMD optimized for ARMv8 processors"
>
> > It"s just harder to read ASM. Most of DPDK code is in C.
> > And only some small functions are written in ASM.
> > The vector instructions use some C intrinsics.
> > Do you mean that the instructions that you are using have no intrinsics
> > equivalent? Nobody made it into GCC?
>
> There is intrinsic equivalent for crypto but that will work only on
> armv8. If we start using the arch specific intrinsic then it better to
> plain ASM code, it is clean and we all do similar scheme for core crypto
> work(like AES-NI library, linux etc)
>
> We did a lot of effort to make clean armv8 ASM code _optimized_ for DPDK workload.
> Just because someone doesn't familiar with armv8 Assembly its not fair to
> say write it in C.
I'm just saying it is sad, as it is sad for AES-NI or Linux code.
Please read again my questions:
Have you tried it? How much is the difference?
I'm not saying it should not enter in DPDK, I'm just asking some basic
questions to better understand the motivations and the status of ARM crypto
in general.
You did not answer for comparing with a C implementation, so I guess you
have implemented it in ASM without even trying to do it in C.
The conclusion: we will never know what is the real gain of coding this in ASM.
next prev parent reply other threads:[~2016-12-07 15:00 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-04 11:33 [dpdk-dev] [PATCH] Add crypto PMD optimized " zbigniew.bodek
2016-12-04 11:33 ` [dpdk-dev] [PATCH 1/3] mk: fix build of assembly files for ARM64 zbigniew.bodek
2016-12-04 11:33 ` [dpdk-dev] [PATCH 2/3] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2016-12-04 11:33 ` [dpdk-dev] [PATCH 3/3] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 00/12] Add crypto PMD optimized for ARMv8 zbigniew.bodek
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 01/12] mk: fix build of assembly files for ARM64 zbigniew.bodek
2016-12-21 14:46 ` De Lara Guarch, Pablo
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 0/8] Add crypto PMD optimized for ARMv8 zbigniew.bodek
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 1/8] mk: fix build of assembly files for ARM64 zbigniew.bodek
2017-01-13 8:13 ` Hemant Agrawal
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 2/8] lib: add cryptodev type for the upcoming ARMv8 PMD zbigniew.bodek
2017-01-13 8:16 ` Hemant Agrawal
2017-01-13 15:50 ` Zbigniew Bodek
2017-01-16 5:57 ` Jianbo Liu
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 3/8] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2017-01-06 2:45 ` Jianbo Liu
2017-01-12 13:12 ` Zbigniew Bodek
2017-01-13 7:41 ` Jianbo Liu
2017-01-13 19:09 ` Zbigniew Bodek
2017-01-13 7:57 ` Hemant Agrawal
2017-01-13 19:15 ` Zbigniew Bodek
2017-01-17 15:48 ` [dpdk-dev] [PATCH v4 0/7] Add crypto PMD optimized for ARMv8 zbigniew.bodek
2017-01-17 15:48 ` [dpdk-dev] [PATCH v4 1/7] lib: add cryptodev type for the upcoming ARMv8 PMD zbigniew.bodek
2017-01-18 2:24 ` Jerin Jacob
2017-01-17 15:48 ` [dpdk-dev] [PATCH v4 2/7] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 0/7] Add crypto PMD optimized for ARMv8 zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 1/7] cryptodev: add cryptodev type for the ARMv8 PMD zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 2/7] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 0/8] Add crypto PMD optimized for ARMv8 zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 1/8] cryptodev: add cryptodev type for the ARMv8 PMD zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 2/8] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 3/8] mk: add PMD to the build system zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 4/8] cryptodev/armv8: introduce ARM-specific feature flags zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 5/8] doc: update documentation about ARMv8 crypto PMD zbigniew.bodek
2017-01-18 20:01 ` [dpdk-dev] [PATCH v6 6/8] crypto/armv8: enable ARMv8 PMD in the configuration zbigniew.bodek
2017-01-18 20:02 ` [dpdk-dev] [PATCH v6 7/8] MAINTAINERS: update MAINTAINERS entry for ARMv8 crypto zbigniew.bodek
2017-01-18 20:02 ` [dpdk-dev] [PATCH v6 8/8] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
2017-01-18 21:14 ` [dpdk-dev] [PATCH v6 0/8] Add crypto PMD optimized for ARMv8 De Lara Guarch, Pablo
2017-01-19 10:36 ` Zbigniew Bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 3/7] mk: add PMD to the build system zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 4/7] doc: update documentation about ARMv8 crypto PMD zbigniew.bodek
2017-01-18 17:05 ` De Lara Guarch, Pablo
2017-01-18 19:52 ` Zbigniew Bodek
2017-01-18 19:54 ` De Lara Guarch, Pablo
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 5/7] crypto/armv8: enable ARMv8 PMD in the configuration zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 6/7] MAINTAINERS: update MAINTAINERS entry for ARMv8 crypto zbigniew.bodek
2017-01-18 14:27 ` [dpdk-dev] [PATCH v5 7/7] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
2017-01-18 15:23 ` [dpdk-dev] [PATCH v5 0/7] Add crypto PMD optimized for ARMv8 Jerin Jacob
2017-01-17 15:48 ` [dpdk-dev] [PATCH v4 3/7] mk: add PMD to the build system zbigniew.bodek
2017-01-17 15:49 ` [dpdk-dev] [PATCH v4 4/7] doc: update documentation about ARMv8 crypto PMD zbigniew.bodek
2017-01-17 15:49 ` [dpdk-dev] [PATCH v4 5/7] crypto/armv8: enable ARMv8 PMD in the configuration zbigniew.bodek
2017-01-17 15:49 ` [dpdk-dev] [PATCH v4 6/7] MAINTAINERS: update MAINTAINERS entry for ARMv8 crypto zbigniew.bodek
2017-01-17 15:49 ` [dpdk-dev] [PATCH v4 7/7] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
2017-01-18 2:26 ` Jerin Jacob
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 4/8] mk/crypto/armv8: add PMD to the build system zbigniew.bodek
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 5/8] doc/armv8: update documentation about crypto PMD zbigniew.bodek
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 6/8] crypto/armv8: enable ARMv8 PMD in the configuration zbigniew.bodek
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 7/8] crypto/armv8: update MAINTAINERS entry for ARMv8 crypto zbigniew.bodek
2017-01-04 17:33 ` [dpdk-dev] [PATCH v3 8/8] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
2017-01-12 10:48 ` De Lara Guarch, Pablo
2017-01-12 11:50 ` Zbigniew Bodek
2017-01-12 12:07 ` De Lara Guarch, Pablo
2017-01-13 9:28 ` Hemant Agrawal
2017-01-10 17:11 ` [dpdk-dev] [PATCH v3 0/8] Add crypto PMD optimized for ARMv8 De Lara Guarch, Pablo
2017-01-10 17:50 ` Zbigniew Bodek
2017-01-13 8:07 ` Hemant Agrawal
2017-01-13 18:59 ` Zbigniew Bodek
2017-01-16 6:57 ` Hemant Agrawal
2017-01-16 8:02 ` Jerin Jacob
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 02/12] lib: add cryptodev type for the upcoming ARMv8 PMD zbigniew.bodek
2016-12-06 20:27 ` Thomas Monjalon
2016-12-07 19:04 ` Zbigniew Bodek
2016-12-07 20:09 ` Thomas Monjalon
2016-12-09 12:06 ` Declan Doherty
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 03/12] crypto/armv8: Add core crypto operations for ARMv8 zbigniew.bodek
2016-12-06 20:29 ` Thomas Monjalon
2016-12-06 21:18 ` Jerin Jacob
2016-12-06 21:42 ` Thomas Monjalon
2016-12-06 22:05 ` Jerin Jacob
2016-12-06 22:41 ` Thomas Monjalon
2016-12-06 23:24 ` Jerin Jacob
2016-12-07 15:00 ` Thomas Monjalon [this message]
2016-12-07 16:30 ` Jerin Jacob
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 04/12] crypto/armv8: Add AES+SHA256 " zbigniew.bodek
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 05/12] crypto/armv8: Add AES+SHA1 " zbigniew.bodek
2016-12-07 2:32 ` [dpdk-dev] [PATCH v2 06/12] crypto/armv8: add PMD optimized for ARMv8 processors zbigniew.bodek
2016-12-21 14:55 ` De Lara Guarch, Pablo
2016-12-07 2:33 ` [dpdk-dev] [PATCH v2 07/12] crypto/armv8: generate ASM symbols automatically zbigniew.bodek
2016-12-07 2:33 ` [dpdk-dev] [PATCH v2 08/12] mk/crypto/armv8: add PMD to the build system zbigniew.bodek
2016-12-21 15:01 ` De Lara Guarch, Pablo
2016-12-07 2:33 ` [dpdk-dev] [PATCH v2 09/12] doc/armv8: update documentation about crypto PMD zbigniew.bodek
2016-12-07 21:13 ` Mcnamara, John
2016-12-07 2:33 ` [dpdk-dev] [PATCH v2 10/12] crypto/armv8: enable ARMv8 PMD in the configuration zbigniew.bodek
2016-12-08 10:24 ` [dpdk-dev] [PATCH v2 00/12] Add crypto PMD optimized for ARMv8 Bruce Richardson
2016-12-08 11:32 ` Zbigniew Bodek
2016-12-08 17:45 ` Jerin Jacob
2016-12-21 15:34 ` Declan Doherty
2016-12-22 4:57 ` Jerin Jacob
2016-12-07 2:36 ` [dpdk-dev] [PATCH v2 11/12] crypto/armv8: update MAINTAINERS entry for ARMv8 crypto zbigniew.bodek
2016-12-07 2:37 ` [dpdk-dev] [PATCH v2 12/12] app/test: add ARMv8 crypto tests and test vectors zbigniew.bodek
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