From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60241) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZZIIj-0007S4-As for qemu-devel@nongnu.org; Tue, 08 Sep 2015 08:47:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZZIIf-00023m-1s for qemu-devel@nongnu.org; Tue, 08 Sep 2015 08:47:05 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60729) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZZIIe-00023g-Tm for qemu-devel@nongnu.org; Tue, 08 Sep 2015 08:47:01 -0400 Date: Tue, 8 Sep 2015 13:46:52 +0100 From: "Dr. David Alan Gilbert" Message-ID: <20150908124652.GK2246@work-vm> References: <1431624680-20153-1-git-send-email-aarcange@redhat.com> <1431624680-20153-20-git-send-email-aarcange@redhat.com> <20150811100728.GB4587@in.ibm.com> <20150811134826.GI4520@redhat.com> <20150812052346.GC4587@in.ibm.com> <1441692486.14597.17.camel@ellerman.id.au> <20150908063948.GB678@in.ibm.com> <20150908085946.GC2246@work-vm> <20150908095915.GC678@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150908095915.GC678@in.ibm.com> Subject: Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Bharata B Rao Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org, Sanidhya Kashyap , linux-mm@kvack.org, Andrea Arcangeli , zhang.zhanghailiang@huawei.com, Pavel Emelyanov , Michael Ellerman , Hugh Dickins , Mel Gorman , "Huangpeng (Peter)" , Andres Lagar-Cavilla , "Kirill A. Shutemov" , Dave Hansen , linux-api@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andy Lutomirski , Johannes Weiner , Paolo Bonzini , Andrew Morton , Linus Torvalds , Peter Feiner * Bharata B Rao (bharata@linux.vnet.ibm.com) wrote: > On Tue, Sep 08, 2015 at 09:59:47AM +0100, Dr. David Alan Gilbert wrote: > > * Bharata B Rao (bharata@linux.vnet.ibm.com) wrote: > > > In fact I had successfully done postcopy migration of sPAPR guest with > > > this setup. > > > > Interesting - I'd not got that far myself on power; I was hitting a problem > > loading htab ( htab_load() bad index 2113929216 (14848+0 entries) in htab stream (htab_shift=25) ) > > > > Did you have to make any changes to the qemu code to get that happy? > > I should have mentioned that I tried only QEMU driven migration within > the same host using wp3-postcopy branch of your tree. I don't see the > above issue. > > (qemu) info migrate > capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks: off compress: off x-postcopy-ram: on > Migration status: completed > total time: 39432 milliseconds > downtime: 162 milliseconds > setup: 14 milliseconds > transferred ram: 1297209 kbytes > throughput: 270.72 mbps > remaining ram: 0 kbytes > total ram: 4194560 kbytes > duplicate: 734015 pages > skipped: 0 pages > normal: 318469 pages > normal bytes: 1273876 kbytes > dirty sync count: 4 > > I will try migration between different hosts soon and check. I hit that on the same host; are you sure you've switched into postcopy mode; i.e. issued a migrate_start_postcopy before the end of migration? (My current world I have working on x86-64 and I've also tested reasonably well on aarch64, and get to that htab problem on Power). Dave > > Regards, > Bharata. > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK