From: Jon Masters <jcm@redhat.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [PATCH 0/1] SMTCTL 0
Date: Tue, 12 Jun 2018 14:06:24 -0400 [thread overview]
Message-ID: <10f6d9f9-2654-8d93-475c-d6bb484c0bdf@redhat.com> (raw)
In-Reply-To: <20180607205525.4515061108@crypto-ml.lab.linutronix.de>
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Hi Andi, all,
First a note that we're going with the kernel approach for the reasons
that Thomas and Jiri already described. We need it to be that easy.
On 06/07/2018 04:54 PM, speck for Andi Kleen wrote:
> - Encourages the right use model of only switching SMT state
> when it is actually needed and based on a conscious decision,
> not unnecessarily or globally.
On this point. We're going to be having some further dialogue with the
other distros and vendors involved about best practice. Our rules say we
must always default to "secure" but the problem in this case is that
it's workload dependent. If you're running OpenStack, and you didn't do
it right (most people) then you probably put different HT threads into
different VMs so we can't just rip them out from underneath you. So we
need to be a bit more cleaver about how we handle customer guidance.
Essentially I've said to Intel (and to others) "we won't throw you under
the bus if you don't throw us under the bus", which needs dialogue.
Jon.
--
Computer Architect | Sent from my Fedora powered laptop
parent reply other threads:[~2018-06-12 18:06 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20180607205525.4515061108@crypto-ml.lab.linutronix.de>]
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