From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752567Ab1L3KO0 (ORCPT ); Fri, 30 Dec 2011 05:14:26 -0500 Received: from e28smtp04.in.ibm.com ([122.248.162.4]:44138 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751857Ab1L3KOW (ORCPT ); Fri, 30 Dec 2011 05:14:22 -0500 From: Nikunj A Dadhania To: Ingo Molnar , Avi Kivity Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, vatsa@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS In-Reply-To: <20111230095147.GA10543@elte.hu> References: <20111219083141.32311.9429.stgit@abhimanyu.in.ibm.com> <20111219112326.GA15090@elte.hu> <87sjke1a53.fsf@abhimanyu.in.ibm.com> <4EF1B85F.7060105@redhat.com> <877h1o9dp7.fsf@linux.vnet.ibm.com> <20111223103620.GD4749@elte.hu> <4EF701C7.9080907@redhat.com> <20111230095147.GA10543@elte.hu> User-Agent: Notmuch/0.10.2+70~gf0e0053 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-redhat-linux-gnu) Date: Fri, 30 Dec 2011 15:40:06 +0530 Message-ID: <878vlu4bgh.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii x-cbid: 11123010-5564-0000-0000-000000B8017B Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 30 Dec 2011 10:51:47 +0100, Ingo Molnar wrote: > > * Avi Kivity wrote: > > > [...] > > > > The first part appears to be unrelated to ebizzy itself - it's > > the kunmap_atomic() flushing ptes. It could be eliminated by > > switching to a non-highmem kernel, or by allocating more PTEs > > for kmap_atomic() and batching the flush. > > Nikunj, please only run pure 64-bit/64-bit combinations - by the > time any fix goes upstream and trickles down to distros 32-bit > guests will be even less relevant than they are today. > Sure Ingo, got a 64bit guest working yesterday and I am in process of getting the benchmark numbers for the same. Regards, Nikunj