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Date: Thu, 7 Sep 2017 23:26:47 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Eric Biggers <ebiggers3@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, Tim Chen <tim.c.chen@linux.intel.com>,
        Mathias Krause <minipli@googlemail.com>,
        Chandramouli Narayanan <mouli@linux.intel.com>,
        Jussi Kivilinna <jussi.kivilinna@iki.fi>,
        Peter Zijlstra <peterz@infradead.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>, linux-crypto@vger.kernel.org,
        Eric Biggers <ebiggers@google.com>, Andy Lutomirski <luto@kernel.org>,
        Jiri Slaby <jslaby@suse.cz>
Subject: Re: [PATCH 00/12] x86/crypto: Fix RBP usage in several crypto .S
 files
Message-ID: <20170907212646.q3y5wmhyaaqblg5m@gmail.com>
References: <cover.1504029132.git.jpoimboe@redhat.com>
 <20170902000919.GA139193@gmail.com>
 <20170907071534.ztbxvyfoo7m7esmw@gmail.com>
 <20170907175800.GA92996@gmail.com>
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* Eric Biggers <ebiggers3@gmail.com> wrote:

> On Thu, Sep 07, 2017 at 09:15:34AM +0200, Ingo Molnar wrote:
> > 
> > * Eric Biggers <ebiggers3@gmail.com> wrote:
> > 
> > > Thanks for fixing these!  I don't have time to review these in detail, but I ran
> > > the crypto self-tests on the affected algorithms, and they all pass.  I also
> > > benchmarked them before and after; the only noticable performance difference was
> > > that sha256-avx2 and sha512-avx2 became a few percent slower.  I don't suppose
> > > there is a way around that?  Otherwise it's probably not a big deal.
> > 
> > Which CPU model did you use for the test?
> > 
> > Thanks,
> > 
> > 	Ingo
> 
> This was on Haswell, "Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz".

Any chance to test this with the latest microarchitecture - any Skylake derivative 
Intel CPU you have access to?

Thanks,

	Ingo