From: Peter Zijlstra <peterz@infradead.org>
To: Jiri Olsa <jolsa@kernel.org>
Cc: "Jean-Pierre Lozi" <jplozi@unice.fr>,
"Jirka Hladky" <jhladky@redhat.com>,
"Petr Surý" <psury@redhat.com>,
lkml <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86/topology: Fallback to SMT level only once
Date: Mon, 29 Aug 2016 12:40:47 +0200 [thread overview]
Message-ID: <20160829104047.GH10153@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1472408386-5254-1-git-send-email-jolsa@kernel.org>
On Sun, Aug 28, 2016 at 08:19:46PM +0200, Jiri Olsa wrote:
> Jirka, Peter and Jean-Pierre reported performance drop on
> some cpus after making cpu offline and online again.
>
> The reason is the kernel logic that falls back to SMT
> level topology if more than one node is detected within
> CPU package. During the system boot this logic cuts out
> the DIE topology level and numa code adds NUMA level
> on top of this.
Its not SMT topology, and back when I asked if he had CoD enabled or
such he said not.
See also:
http://lkml.kernel.org/r/1471559812-19967-3-git-send-email-srinivas.pandruvada@linux.intel.com
Arguably, that should have been split in two patches, but alas..
next prev parent reply other threads:[~2016-08-29 10:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-28 18:19 [PATCH] x86/topology: Fallback to SMT level only once Jiri Olsa
2016-08-29 10:40 ` Peter Zijlstra [this message]
2016-08-29 11:09 ` Jiri Olsa
2016-08-29 12:20 ` Jirka Hladky
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