From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:49009)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <riel@redhat.com>) id 1T4CmH-0005hh-UA
	for qemu-devel@nongnu.org; Wed, 22 Aug 2012 11:23:36 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <riel@redhat.com>) id 1T4CmG-0002W7-Dw
	for qemu-devel@nongnu.org; Wed, 22 Aug 2012 11:23:29 -0400
Received: from mx1.redhat.com ([209.132.183.28]:3662)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <riel@redhat.com>) id 1T4CmG-0002W0-6F
	for qemu-devel@nongnu.org; Wed, 22 Aug 2012 11:23:28 -0400
Message-ID: <5034F8F4.3080301@redhat.com>
Date: Wed, 22 Aug 2012 11:21:24 -0400
From: Rik van Riel <riel@redhat.com>
MIME-Version: 1.0
References: <20120816104727.GA17166@alpha.arachsys.com>
	<502CDC0D.9080004@redhat.com>
	<20120817123642.GA16736@alpha.arachsys.com>
	<5030F273.5080706@redhat.com>
	<20120820135656.GA16676@alpha.arachsys.com>
	<50334E13.8020100@redhat.com>
	<20120821152107.GA16363@alpha.arachsys.com>
	<5034A18B.5040408@redhat.com>
	<20120822124032.GA12647@alpha.arachsys.com>
	<5034D437.8070106@redhat.com>
	<20120822144150.GA1400@alpha.arachsys.com>
In-Reply-To: <20120822144150.GA1400@alpha.arachsys.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] Windows slow boot: contractor wanted
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Richard Davies <richard.davies@elastichosts.com>
Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org

On 08/22/2012 10:41 AM, Richard Davies wrote:
> Avi Kivity wrote:
>> Richard Davies wrote:
>>> I can trigger the slow boots without KSM and they have the same profile,
>>> with _raw_spin_lock_irqsave and isolate_freepages_block at the top.
>>>
>>> I reduced to 3x 20GB 8-core VMs on a 128GB host (rather than 3x 40GB 8-core
>>> VMs), and haven't managed to get a really slow boot yet (>5 minutes). I'll
>>> post agan when I get one.
>>
>> I think you can go higher than that.  But 120GB on a 128GB host is
>> pushing it.
>
> I've now triggered a very slow boot at 3x 36GB 8-core VMs on a 128GB host
> (i.e. 108GB on a 128GB host).
>
> It has the same profile with _raw_spin_lock_irqsave and
> isolate_freepages_block at the top.

That's the page compaction code.

Mel Gorman and I have been working to fix that,
the latest fixes and improvements are in the -mm
kernel already.