Messages in this thread | | | Date | Wed, 21 Sep 2022 16:20:01 +0800 | Subject | Re: [RFC PATCH 2/6] crypto: benchmark - add a crypto benchmark tool | From | Yang Shen <> |
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在 2022/9/20 15:31, Greg KH 写道: > On Mon, Sep 19, 2022 at 08:05:33PM +0800, Yang Shen wrote: >> Provide a crypto benchmark to help the developer quickly get the >> performance of a algorithm registered in crypto. >> >> Due to the crypto algorithms have multifarious parameters, the tool >> cannot support all test scenes. In order to provide users with simple >> and easy-to-use tools and support as many test scenarios as possible, >> benchmark refers to the crypto method to provide a unified struct >> 'crypto_bm_ops'. And the algorithm registers its own callbacks to parse >> the user's input. In crypto, a algorithm class has multiple algorithms, >> but all of them uses the same API. So in the benchmark, a algorithm >> class uses the same 'ops' and distinguish specific algorithm by name. >> >> First, consider the performance calculation model. Considering the >> crypto subsystem model, a reasonable process code based on crypto api >> should create a numa node based 'crypto_tfm' in advance and apply for >> a certain amount of 'crypto_req' according to their own business. >> In the real business processing stage, the thread send tasks based on >> 'crypto_req' and wait for completion. >> >> Therefore, the benchmark will create 'crypto_tfm' and 'crypto_req' at >> first, and then count all requests time to calculate performance. >> So the result is the pure algorithm performance. When each algorithm >> class implements its own 'ops', it needs to pay attention to the content >> completed in the callback. Before the 'ops.perf', the tool had better >> prepare the request data set. And in order to avoid the false high >> performance of the algorithm caused by the false cache and TLB hit rate, >> the size of data set should be larger than 'crypto_req' number. >> The 'crypto_bm_ops' has following api: >> - init & uninit >> The initialize related functions. Algorithm can do some private setting. >> - create_tfm & release_tfm >> The 'crypto_tfm' related functions. Algorithm has different tfm name in >> crypto. But they both has a member named tfm, so use tfm to stand for >> algorithm handle. The benchmark has provides the tfm array. >> - create_req & release_req >> The 'crypto_req' related functions. The callbacks should create a 'reqnum' >> 'crypto_req' group in struct 'crypto_bm_base'. And the also suggest >> prepare the request data in this function. In order to avoid the false >> high performance of the algorithm caused by the false cache and TLB hit >> rate, the size of data set should be larger than 'crypto_req' number. >> - perf >> The request sending functions. The registrant should use parameter 'loop' >> to send requests repeatly. And update the count in struct >> 'crypto_bm_thread_data'. >> >> Then consider the parameters that user can configure. Generally speaking, >> the following parameters will affect the performance of the algorithm: >> tfm number, request number, block size, numa node. And some parameters >> will affect the stability of performance: testing time and requests sent >> number. To sum up, the benchmark has following parameters: >> - algorithm >> The testing algorithm name. Showed in /proc/crypto. >> - algtype >> The testing algorithm class. Can get the algorithm class by echo 'algtype' >> to /sys/module/crypto_benchmark/parameters/help. >> - inputsize >> The testing length that can greatly impact performance. Such as data size >> for compress or key length for encryption. >> - loop >> The testing loop times. Avoid performance fluctuations caused by >> environment. >> - numamask >> The testing bind numamask. Used for allocate memory, create threads and >> create 'crypto_tfm'. >> - optype >> The testing algorithm operation type. Can get the algorithm available >> operation types by cat /sys/module/crypto_benchmark/parameters/help >> with specified 'algtype'. >> - reqnum >> The testing request number for per tfm. Used for test asynchrony api >> performance. >> - threadnum >> The testing thread number. To simplify model, create a 'crypto_tfm' per >> thread. >> - time >> The testing time. Used for stop the test thread. >> - run >> Start or stop the test. >> >> Users can configure parameters under >> /sys/modules/crypto_benchmark/parameters/. > Please don't use module parameters for stuff like this, use configfs > which was designed for this type of interactions. > > thanks, > > greg k-h Got it!
Thanks,
Yang
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