From: Marcelo Tosatti <mtosatti@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Vikas Shivappa <vikas.shivappa@intel.com>,
Tejun Heo <tj@kernel.org>, Yu Fenghua <fenghua.yu@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC] ioctl based CAT interface
Date: Fri, 13 Nov 2015 15:33:04 -0200 [thread overview]
Message-ID: <20151113173303.GB13490@amt.cnet> (raw)
In-Reply-To: <20151113165100.GI17308@twins.programming.kicks-ass.net>
On Fri, Nov 13, 2015 at 05:51:00PM +0100, Peter Zijlstra wrote:
> On Fri, Nov 13, 2015 at 02:39:33PM -0200, Marcelo Tosatti wrote:
> > + * * one tcrid entry can be in different locations
> > + * in different sockets.
>
> NAK on that without cpuset integration.
>
> I do not want freely migratable tasks having radically different
> performance profiles depending on which CPU they land.
Ok, so, configuration:
Socket-1 Socket-2
pinned thread-A with 100% L3 free
80% of L3
reserved
So it is a problem if a thread running on socket-2 is scheduled to
socket-1 because performance is radically different, fine.
Then one way to avoid that is to not allow freely migratable tasks
to move to Socket-1. Fine.
Then you want to use cpusets for that.
Can you fill in the blanks what is missing here?
next prev parent reply other threads:[~2015-11-13 17:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-13 16:39 [PATCH RFC] ioctl based CAT interface Marcelo Tosatti
2015-11-13 16:51 ` Peter Zijlstra
2015-11-13 17:27 ` Marcelo Tosatti
2015-11-13 17:43 ` Marcelo Tosatti
2015-11-16 8:59 ` Peter Zijlstra
2015-11-16 13:03 ` Marcelo Tosatti
2015-11-16 14:42 ` Thomas Gleixner
2015-11-16 19:52 ` Marcelo Tosatti
2015-11-16 15:01 ` Peter Zijlstra
2015-11-16 19:54 ` Marcelo Tosatti
2015-11-16 21:22 ` Marcelo Tosatti
2015-11-13 19:04 ` Luiz Capitulino
2015-11-13 20:22 ` Marcelo Tosatti
2015-11-16 9:03 ` Peter Zijlstra
2015-11-13 17:33 ` Marcelo Tosatti [this message]
2015-11-16 9:07 ` Peter Zijlstra
2015-11-16 14:37 ` Marcelo Tosatti
2015-11-16 15:37 ` Peter Zijlstra
2015-11-16 16:18 ` Luiz Capitulino
2015-11-16 16:26 ` Peter Zijlstra
2015-11-16 16:48 ` Luiz Capitulino
2015-11-16 16:39 ` Marcelo Tosatti
2015-11-17 1:01 ` Marcelo Tosatti
2015-11-13 18:01 ` Marcelo Tosatti
2015-11-16 9:09 ` Peter Zijlstra
2015-11-13 19:08 ` Luiz Capitulino
2015-12-03 21:58 ` Pavel Machek
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