From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45087) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UlWzl-0006fE-TB for qemu-devel@nongnu.org; Sun, 09 Jun 2013 00:12:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UlWzk-0007io-JM for qemu-devel@nongnu.org; Sun, 09 Jun 2013 00:12:45 -0400 MIME-Version: 1.0 In-Reply-To: <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> <49FB93E9-FBFD-4C68-9A65-76AE025B2E20@kamp.de> From: liu ping fan Date: Sun, 9 Jun 2013 12:12:22 +0800 Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Subject: Re: [Qemu-devel] broken incoming migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Lieven Cc: Alexey Kardashevskiy , Paolo Bonzini , "qemu-ppc@nongnu.org" , "qemu-devel@nongnu.org" , David Gibson Hi Peter, Is it that sending zero page mostly service the first iteration, ie bluk-stage? And for the subsequent iteration, dirty pages are normally not zero. Thanks On Wed, Jun 5, 2013 at 2:09 PM, Peter Lieven wrote: > > Am 05.06.2013 um 05:37 schrieb Alexey Kardashevskiy : > >> On 06/05/2013 05:15 AM, Peter Lieven wrote: >>> >>> Am 04.06.2013 um 17:17 schrieb Paolo Bonzini : >>> >>>> 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. >>>>> >>>>> 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. >>>> >>>> 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. >>> >>> that's it. thanks for the pointer. the huge zero page was introduced in 3.8. >>> >>> paolo, alexey: can you please verify the following works for you: >>> https://github.com/plieven/qemu/tree/fix-migration >> >> 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. > >> >> That works for me (qemu 1.5, kernel 3.9-rc2). >> Tested-by: Alexey Kardashevskiy > > Thank you, > Peter