On Sat, Oct 10, 2015 at 12:31:29PM +0200, Arnaud Ebalard wrote:
> Hi Russel,
^
> Russell King - ARM Linux <[email protected]> writes:
> > Software:
> > The 'numbers' are in 1000s of bytes per second processed.
> > type 16 bytes 64 bytes 256 bytes 1024 bytes 8192
> > bytes
> > md5 13948.89k 42477.61k 104619.41k 165140.82k
> > 199273.13k
> > sha1 13091.91k 36463.89k 75393.88k 103893.33k
> > 117104.50k
> > sha256 13573.92k 30492.25k 52700.33k 64247.81k
> > 68722.69k
> >
> > Hardware:
> > The 'numbers' are in 1000s of bytes per second processed.
> > type 16 bytes 64 bytes 256 bytes 1024 bytes 8192
> > bytes
> > md5 3964.55k 13782.11k 43181.71k 180263.38k
> > 1446616.18k
> > sha1 4609.16k 8922.35k 35422.87k 333575.31k
> > 2122547.20k
> > sha256 13519.62k 30484.10k 52547.47k 64285.21k
> > 68530.60k
Okay, the reason for the difference in SHA256 speed is because the
"openssl speed" code *totally* *bypasses* the engine support, whereas
the md5 and sha1 do not. It even bypasses the normal method used to
get hold of the sha256 implementation (EVP_sha256), and goes straight
to using SHA256() directly in openssl/crypto/sha/sha256.c. It looks
like the same goes for the AES tests too.
> I had a lot of performance results at various levels (tcrypt module on
> variations of the drivers (tasklet, threaded irq, full polling, etc),
> IPsec tunnel and transport mode through to see how it behaves w/ two
> mvneta instances also eating CPU cycles for incoming/outgoing packets)
> but those where done on an encryption use case. Some are provided
> in [2]. In an early (read dirty) polling-based version of the driver,
> the CESA on an Armada 370 (mirabox) was verified to be capable of near
> 100MB/s on buffers of 1500+ bytes for AES CBC encryption. Current
> version of the driver is not as good (say half that value) but it
> behaves better. A Mirabox can easily route 1500 bytes packets at 100MB/s
> between its two interfaces but when you mix both using IPsec in tunnel
> mode on one side, you end up w/ perfs between 10 to 15MB/s, IIRC. I
> think it's interesting to see where it ends up w/ the engine exposed to
> userland consumers (e.g. sth like SSH).
>
> I cannot promise a huge amount of time but I'll try and find some to
> play w/ AF_ALG using openssl and CESA in the coming weeks.
I think what we draw from my investigation is that "openssl speed" is
utterly crap - you don't actually know what's being tested there. Some
things test the engine, others bypass the engine infrastructure totally
and test the openssl software implementation instead.
So, if you think "openssl speed" is a good way to measure the speed of
digests and ciphers that openssl supplies to applications, *think again*.
It doesn't.
--
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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