From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58861) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyu9z-0003j4-Pb for qemu-devel@nongnu.org; Wed, 10 Dec 2014 22:11:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xyu9s-0000J3-MM for qemu-devel@nongnu.org; Wed, 10 Dec 2014 22:11:23 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:27035) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyu9r-0000IO-T2 for qemu-devel@nongnu.org; Wed, 10 Dec 2014 22:11:16 -0500 Message-ID: <54890B3F.7010306@huawei.com> Date: Thu, 11 Dec 2014 11:10:55 +0800 From: Linhaifeng MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] How to send memory info List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: liuyongan@huawei.com, lilijun , "n.nikolaev@virtualopensystems.com >> Nikolay Nikolaev" , "Michael S. Tsirkin" Hi,all Yestoday i tested the set_mem_table message found that qemu not send all the memory info(fd and size) when VM memory size is 2G and have two numa nodes(two hugepage files).If VM memory size is 4G and have two numa nodes will send all the memory info. Here is my understand,is this right? If qemu not send all the memory infomation about hugepage files,vhost-user couldn't map all the VM memory. If vhost-user couldn't map all the VM memory vhost-user maybe couldn't read the packets which allocate by Guest. 1.Information about VM who has 2G and two numa nodes(vhost-user couldn't read the packets from tx_ring of Guest): xml: qemu command: -m 2048 -smp 2,sockets=2,cores=1,threads=1 -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=1024M,id=ram-node0 -numa node,nodeid=0,cpus=0,memdev=ram-node0 -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=1024M,id=ram-node1 -numa node,nodeid=1,cpus=1,memdev=ram-node1 memory regions: gpa = 0xC0000 size = 2146697216 ua = 0x2aaaaacc0000 offset = 786432 gpa = 0x0 size = 655360 ua = 0x2aaaaac00000 offset = 0 hugepage: cat /proc/pidof qemu/maps 2aaaaac00000-2aaaeac00000 rw-s 00000000 00:18 10357788 /dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node0.MvcPyi (deleted) 2aaaeac00000-2aab2ac00000 rw-s 00000000 00:18 10357789 /dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node1.tjAVin (deleted) The memory size of each region is not match to the size of each hugepage file,is this ok?How does vhost-user to mmap all the hugepage? 2.Information about VM who has 4G and two numa nodes(vhost-user could read the packets from tx_ring of Guest): xml: qemu command: -m 4096 -smp 2,sockets=2,cores=1,threads=1 -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=2048M,id=ram-node0 -numa node,nodeid=0,cpus=0,memdev=ram-node0 -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=on,size=2048M,id=ram-node1 -numa node,nodeid=1,cpus=1,memdev=ram-node1 memory regions: gpa = 0xC0000 size = 3220439040 ua = 0x2aaaaacc0000 offset = 786432 gpa = 0x100000000 size = 1073741824 ua = 0x2aab6ac00000 offset = 1073741824 gpa = 0x0 size = 655360 ua = 0x2aaaaac00000 offset = 0 hugepage: cat /proc/pidof qemu/maps 2aaaaac00000-2aab2ac00000 rw-s 00000000 00:18 10756623 /dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node0.If4Qkf (deleted) 2aab2ac00000-2aabaac00000 rw-s 00000000 00:18 10756624 /dev/hugepages/libvirt/qemu/qemu_back_mem._objects_ram-node1.jQZPcI (deleted) -- Regards, Haifeng