From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46497) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uk6uP-00039y-FB for qemu-devel@nongnu.org; Wed, 05 Jun 2013 02:09:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uk6uM-0002WY-Oj for qemu-devel@nongnu.org; Wed, 05 Jun 2013 02:09:21 -0400 Content-Type: text/plain; charset=koi8-r Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Peter Lieven In-Reply-To: <51AEB267.6020504@ozlabs.ru> Date: Wed, 5 Jun 2013 08:09:25 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <49FB93E9-FBFD-4C68-9A65-76AE025B2E20@kamp.de> References: <51A7036A.3050407@ozlabs.ru> <51A7049F.6040207@redhat.com> <51A70B3D.90609@ozlabs.ru> <51A71705.6060009@kamp.de> <51A74D79.7040204@redhat.com> <2765FDFA-8050-4AA3-8621-7E9EA2C89F9C@kamp.de> <51A764FC.7080705@redhat.com> <51ADF122.70307@kamp.de> <51ADF637.7060804@redhat.com> <51ADFBCE.3080200@kamp.de> <51ADFC7A.7030009@redhat.com> <51ADFE4C.6050504@kamp.de> <51AE04ED.9030108@redhat.com> <51AEB267.6020504@ozlabs.ru> Subject: Re: [Qemu-devel] broken incoming migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexey Kardashevskiy Cc: Paolo Bonzini , "qemu-ppc@nongnu.org" , "qemu-devel@nongnu.org" , David Gibson Am 05.06.2013 um 05:37 schrieb Alexey Kardashevskiy : > On 06/05/2013 05:15 AM, Peter Lieven wrote: >>=20 >> Am 04.06.2013 um 17:17 schrieb Paolo Bonzini : >>=20 >>> Il 04/06/2013 16:48, Peter Lieven ha scritto: >>>> Still using 3.2, but strange enough the above example is also not >>>> increasing RSS size for me. >>>>=20 >>>> Can you try the following: >>>> qemu git master with 1G of memory (hanging in bios with no boot = device) >>>> and migrate it. Before migration RSS Size os somewhat >>>> around 16MB. After migration its RSS size is in the order of 1G. >>>=20 >>> That may be a kernel bug. The kernel did not do the copy-on-write = trick >>> on huge zero pages. It was fixed last year, maybe 3.2 is not = enough. >>> Try adding a MADV_HUGEPAGE madvise to the testcase and see if it = reproduces. >>=20 >> that's it. thanks for the pointer. the huge zero page was introduced = in 3.8. >>=20 >> paolo, alexey: can you please verify the following works for you: >> https://github.com/plieven/qemu/tree/fix-migration >=20 > These two? > 848b796 Tue Jun 4 14:43:04 2013 +0200 Peter Lieven migration: do not > overwrite zero pages > 2206ac8 Tue Jun 4 14:25:33 2013 +0200 Peter Lieven Revert "migration: = do > not sent zero pages in bulk stage" Yes, sorry forgot to mention this. >=20 > That works for me (qemu 1.5, kernel 3.9-rc2). > Tested-by: Alexey Kardashevskiy Thank you, Peter=