Op 16 okt. 2013, om 11:20 heeft Phil Blundell <p...@pbcl.net> het volgende
geschreven:
> On Wed, 2013-10-16 at 09:25 +0200, Koen Kooi wrote:
>> From: Koen Kooi <koen.k...@linaro.org>
>>
>> This enables aes and sha1 assembly at buildtime. Openssl does a
>> runtime check to see which portion gets enabled.
>
> [...]
>
>> Algo blocksize ops/s after
>> ops/s before difference
>> -------------------------------------------
>> MD5 16 308,766 264,664 -14.28%
>> 64 277,090 263,340 -4.96%
>> 256 212,652 197,043 -7.34%
>> 1024 103,604 100,157 -3.33%
>> 8192 17,936 17,796 -0.78%
>
> Do you know why it's causing MD5 to get slower? I guess md5 with
> blocksize=16 is not a very common case, but still.
I really don't know and it is the only algo that gets a lot slower. This patch
is a preparation for (more) NEON optimizations which seem to fix the
regression, see
https://docs.google.com/spreadsheet/ccc?key=0AhgZ33Tf6eBldHVONjRXRnItWld4eFlRWTJ3RzVIdGc&usp=sharing
and
http://dominion.thruhere.net/koen/angstrom/0002-openssl-1.0.1e-add-ARMv7-AES-optimizations.patch
I need to test that patch on A9 and A15 cores as well since it doesn't seem to
do a lot on A8 cores :(
> Also, it seems generally a bit unwholesome for openssl to be picking its
> own CFLAGS at all. Would it be better to just make it use the same
> CFLAGS as everything else?
openssl.inc already pokes at CLAG(S):
CFLAG = "${@base_conditional('SITEINFO_ENDIANNESS', 'le', '-DL_ENDIAN',
'-DB_ENDIAN', d)} \
-DTERMIO ${CFLAGS} -Wall -Wa,--noexecstack"
The complete command looks like this:
arm-angstrom-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork
-mfloat-abi=hard -mfpu=neon -mtune=cortex-a8
--sysroot=/build/v2013.06/build/tmp-angstrom_v2013_06-eglibc/sysroots/beaglebone
-I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT
-DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -O2 -pipe -g
-feliminate-unused-debug-types -Wall -Wa,--noexecstack -DHAVE_CRYPTODEV
-DUSE_CRYPTODEV_DIGESTS -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM
-DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM -c -c -o
armv4cpuid.o armv4cpuid.S
So the '$cflags = -DTERMIO -O3 -Wall' in linux-armv4 gets overridden by
OE, just like we want :)
regards,
Koen
_______________________________________________
Openembedded-core mailing list
Openembedded-core@lists.openembedded.org
http://lists.openembedded.org/mailman/listinfo/openembedded-core
