linux-kernel - Re: Real-time scheduling policies and hyper-threading

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Message-ID: <20140425151116.GJ11096@twins.programming.kicks-ass.net>
Date:	Fri, 25 Apr 2014 17:11:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Roman Gushchin <klamm@...dex-team.ru>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"tkhai@...dex.ru" <tkhai@...dex.ru>
Subject: Re: Real-time scheduling policies and hyper-threading

On Fri, Apr 25, 2014 at 07:02:16PM +0400, Roman Gushchin wrote:
> Hm. What I really want (and try to implement), is 
> "work as if ht is disabled if there are free physical cores, start using ht siblings otherwise".

At which point I have to ask, what about the rest of the topology?

Also, how is a task to know if its the 16th or 17th and thus should
expect worse latency?

> It's a 32-thread processor with 16 physical cores.

No NUMA? I'm not aware of single node systems with 16 cores.
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