linux-kernel - Re: [PATCH 00/10] crypto: omap-aes: DMA and PIO mode improvements

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Date:	Thu, 15 Aug 2013 08:58:34 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	joelf@...com
Cc:	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	Mark Greer <mgreer@...malcreek.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 00/10] crypto: omap-aes: DMA and PIO mode improvements

On 15/08/13 02:30, Joel Fernandes wrote:
> On 08/14/2013 06:12 PM, Joel Fernandes wrote:
>> This patch series is a rewrite of the DMA portion of omap-aes driver
>> and also adds support for PIO mode. Both these modes, give better
>> performance than before.
>>
>> Earlier, only a single SG was used for DMA purpose, and the SG-list
>> passed from the crypto layer was being copied and DMA'd one entry at
>> a time. This turns out to be quite inefficient, so we replace it with
>> much simpler code that directly passes the SG-list from crypto to the
>> DMA layer.
>>
>> We also add PIO mode support to the driver, and switch to PIO mode
>> whenever the DMA channel allocation is not available. This is only for
>> OMAP4 platform will work on any platform on which IRQ information is
>> populated.
>>
>> Tests performed on am33xx and omap4 SoCs , notice the 50% perf improvement
> Just correcting, this is more like 35% not 50% when using DMA.

Hmm :)

1766/1460 = ~20%

>
> Thanks,
>
> -Joel
>
>
>
>
>
>> for large 8K blocks:
>>
>> Sample run on am33xx (beaglebone):
>> With DMA rewrite:
>> [   26.410052] test 0 (128 bit key, 16 byte blocks): 4318 operations in 1 seconds (69088 bytes)
>> [   27.414314] test 1 (128 bit key, 64 byte blocks): 4360 operations in 1 seconds (279040 bytes)
>> [   28.414406] test 2 (128 bit key, 256 byte blocks): 3609 operations in 1 seconds (923904 bytes)
>> [   29.414410] test 3 (128 bit key, 1024 byte blocks): 3418 operations in 1 seconds (3500032 bytes)
>> [   30.414510] test 4 (128 bit key, 8192 byte blocks): 1766 operations in 1 seconds (14467072 bytes)
>>
>> Without DMA rewrite:
>> [   31.920519] test 0 (128 bit key, 16 byte blocks): 4417 operations in 1 seconds (70672 bytes)
>> [   32.925997] test 1 (128 bit key, 64 byte blocks): 4221 operations in 1 seconds (270144 bytes)
>> [   33.926194] test 2 (128 bit key, 256 byte blocks): 3528 operations in 1 seconds (903168 bytes)
>> [   34.926225] test 3 (128 bit key, 1024 byte blocks): 3281 operations in 1 seconds (3359744 bytes)
>> [   35.926385] test 4 (128 bit key, 8192 byte blocks): 1460 operations in 1 seconds (11960320 bytes)
>>
>> With PIO mode, note the tremndous boost in performance for small blocks there:
>> [   27.294905] test 0 (128 bit key, 16 byte blocks): 20585 operations in 1 seconds (329360 bytes)
>> [   28.302282] test 1 (128 bit key, 64 byte blocks): 8106 operations in 1 seconds (518784 bytes)
>> [   29.302374] test 2 (128 bit key, 256 byte blocks): 2359 operations in 1 seconds (603904 bytes)
>> [   30.302575] test 3 (128 bit key, 1024 byte blocks): 605 operations in 1 seconds (619520 bytes)
>> [   31.303781] test 4 (128 bit key, 8192 byte blocks): 79 operations in 1 seconds (647168 bytes)
>>
>> Future work in this direction would be to dynamically change between
>> PIO/DMA mode based on the block size.
>>
>> Joel Fernandes (10):
>>   crypto: scatterwalk:  Add support for calculating number of SG
>>     elements
>>   crypto: omap-aes: Add useful debug macros
>>   crypto: omap-aes: Populate number of SG elements
>>   crypto: omap-aes: Simplify DMA usage by using direct SGs
>>   crypto: omap-aes: Sync SG before DMA operation
>>   crypto: omap-aes: Remove previously used intermediate buffers
>>   crypto: omap-aes: Add IRQ info and helper macros
>>   crypto: omap-aes: PIO mode: Add IRQ handler and walk SGs
>>   crypto: omap-aes: PIO mode: platform data for OMAP4 and trigger it
>>   crypto: omap-aes: Switch to PIO mode in probe function
>>
>>  crypto/scatterwalk.c         |   22 +++
>>  drivers/crypto/omap-aes.c    |  400 ++++++++++++++++++++----------------------
>>  include/crypto/scatterwalk.h |    2 +
>>  3 files changed, 217 insertions(+), 207 deletions(-)
>>
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