Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751836AbaDYPLU (ORCPT ); Fri, 25 Apr 2014 11:11:20 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:52189 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751293AbaDYPLS (ORCPT ); Fri, 25 Apr 2014 11:11:18 -0400 Date: Fri, 25 Apr 2014 17:11:16 +0200 From: Peter Zijlstra To: Roman Gushchin Cc: LKML , "mingo@redhat.com" , "tkhai@yandex.ru" Subject: Re: Real-time scheduling policies and hyper-threading Message-ID: <20140425151116.GJ11096@twins.programming.kicks-ass.net> References: <36851398363372@webcorp2g.yandex-team.ru> <20140424185858.GB26782@laptop.programming.kicks-ass.net> <17051398423889@webcorp2e.yandex-team.ru> <20140425131620.GB11096@twins.programming.kicks-ass.net> <34791398438136@webcorp2g.yandex-team.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34791398438136@webcorp2g.yandex-team.ru> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/