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Date:   Sat, 10 Jun 2023 22:06:03 +0800
From:   Oliver Sang <oliver.sang@intel.com>
To:     Stephan Mueller <smueller@chronox.de>
CC:     <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        <linux-crypto@vger.kernel.org>, <ying.huang@intel.com>,
        <feng.tang@intel.com>, <fengwei.yin@intel.com>
Subject: Re: [linux-next:master] [crypto]  bb897c5504:
 stress-ng.af-alg.ops_per_sec -8.0% regression
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 <1697789.S9sCK8dtJg@tauon.chronox.de>
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hi, Stephan,

On Fri, Jun 09, 2023 at 01:57:27PM +0200, Stephan Mueller wrote:
> Am Freitag, 9. Juni 2023, 10:02:32 CEST schrieb kernel test robot:
> 
> Hi,
> 
> > Hello,
> > 
> > kernel test robot noticed a -8.0% regression of stress-ng.af-alg.ops_per_sec
> > on:
> > 
> > 
> > commit: bb897c55042e9330bcf88b4b13cbdd6f9fabdd5e ("crypto: jitter - replace
> > LFSR with SHA3-256")
> > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> > 
> > testcase: stress-ng
> > test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @
> > 3.00GHz (Cascade Lake) with 128G memory parameters:
> 
> Thank you for the report, but this change in performance is expected to ensure 
> proper entropy collection. I assume that the jitterentropy_rng is queried via 
> AF_ALG. Considering that the amount of data to be generated (and thus the 
> effect of the performance degradation) is small, there should be no noticeable 
> impact on users.

got it. Thanks a lot for information!

> 
> Ciao
> Stephan
> 
>