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Re: [PATCH] Don't use SSE4_2 instructions on Intel Silvermont Micro Architecture.
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Carlos O'Donell <carlos at redhat dot com>
- Cc: Dmitrieva Liubov <liubov dot dmitrieva at gmail dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Thu, 20 Jun 2013 17:17:11 +0200
- Subject: Re: [PATCH] Don't use SSE4_2 instructions on Intel Silvermont Micro Architecture.
- References: <CAHjhQ93=uegeZg9iTqoJ+PFuUrvn8e2mA8tZ96Jy4CaV6aPbWg at mail dot gmail dot com> <20130617163729 dot GA15981 at domone dot kolej dot mff dot cuni dot cz> <CAHjhQ93zmP525hqW-2RnHBREc_949XLnm7sE-CSv3Nj8PQgUig at mail dot gmail dot com> <CAMe9rOqT31AFq1S3V0Krh2CZnHu=FiyXqhg840fimRtfU4_hXQ at mail dot gmail dot com> <20130618064910 dot GA19972 at domone dot kolej dot mff dot cuni dot cz> <CAHjhQ90Fc0kdZfQrUwLwpKbz2va4X9rzf1EkGD-s-RH-iF7guQ at mail dot gmail dot com> <CAHjhQ92qfjdKZthqAwxCVuCnLqDr2stdEbQpne5rKhzJPeN_cQ at mail dot gmail dot com> <51C23583 dot 1070307 at redhat dot com> <CAHjhQ93vWnCiVVU9MPoGptjQtn2J2PCDT2B7ZfXiKt+Cv_Rh_w at mail dot gmail dot com> <51C307A5 dot 7030608 at redhat dot com>
On Thu, Jun 20, 2013 at 09:46:13AM -0400, Carlos O'Donell wrote:
> On 06/20/2013 09:10 AM, Dmitrieva Liubov wrote:
> > What benchmarks do you mean? string/test-str** unit tests?
>
> I mean the new glibc microbenchmark suite :-)
>
Are you sure about that?
Lets take aside from while that this is "You do not have look to
barometer to see if it is raining." situation.
What you have is currently nowhere near of state where you can get
usable results by it. It has five major flaws that i wrote earlier and
any of them is enough to have paper immidiately rejected.
Dangers of using benchmarks that provide wrong data are real. And about
as severe as if you went to hospital, got to test blood sugar level but
in laboratory they would test level of salt instead.