From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Hansen <dave.hansen@intel.com>,
Leonid Shatz <leonid.shatz@ravellosystems.com>,
"'Ingo Molnar'" <mingo@kernel.org>,
linux-kernel@vger.kernel.org,
"'Yu-cheng Yu'" <yu-cheng.yu@intel.com>,
"'Andy Lutomirski'" <luto@amacapital.net>,
"'Borislav Petkov'" <bp@alien8.de>,
"'Fenghua Yu'" <fenghua.yu@intel.com>,
"'Linus Torvalds'" <torvalds@linux-foundation.org>,
"'Oleg Nesterov'" <oleg@redhat.com>,
"'Peter Zijlstra'" <peterz@infradead.org>,
"'Quentin Casasnovas'" <quentin.casasnovas@oracle.com>,
"'Ravi V. Shankar'" <ravi.v.shankar@intel.com>,
"'Sai Praneeth Prakhya'" <sai.praneeth.prakhya@intel.com>,
"'Thomas Gleixner'" <tglx@linutronix.de>
Cc: liran.alon@ravellosystems.com, mendel.aizner@ravellosystems.com,
"'Elazar Leibovich'" <elazar.leibovich@ravellosystems.com>,
"'Eyal Moscovici'" <eyal.moscovici@ravellosystems.com>,
gil.hoffer@ravellosystems.com
Subject: Re: Linux patch disabling AVX when eagerfpu is turned off - possibly not required
Date: Thu, 21 Jan 2016 12:11:52 -0800 [thread overview]
Message-ID: <56A13B88.1090505@zytor.com> (raw)
In-Reply-To: <56A13AC7.2040601@intel.com>
On 01/21/16 12:08, Dave Hansen wrote:
> On 01/21/2016 02:33 AM, Leonid Shatz wrote:
>> In view of above findings we would like to suggest to double check if
>> disabling AVX together with "eagerfpu off" is actually required and is a
>> real necessity. It would be helpful to consult with Intel engineers
>> regarding related design details.
>
> Hi Leonid,
>
> Thanks for the report!
>
> Are you aware of any actual eagerfpu=off use in practice, or is this
> mostly a theoretical concern?
>
Looking into this, FWIW.
-hpa
next prev parent reply other threads:[~2016-01-21 20:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 10:33 Linux patch disabling AVX when eagerfpu is turned off - possibly not required Leonid Shatz
2016-01-21 20:08 ` Dave Hansen
2016-01-21 20:11 ` H. Peter Anvin [this message]
2016-01-21 21:03 ` Andy Lutomirski
2016-01-21 21:03 ` Yu-cheng Yu
2016-01-21 21:08 ` H. Peter Anvin
2016-01-21 21:12 ` Yu-cheng Yu
2016-01-21 21:19 ` Leonid Shatz
2016-01-21 21:22 ` H. Peter Anvin
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