Hi, as the subject states, I have some problems with 1G hugepages with qemu(-vfio-git) on Linux 3.12-rc3. I start qemu like this, for example: "/usr/bin/qemu-system-x86_64 -enable-kvm -m 1024 -mem-path /dev/hugepages -drive file=/files/vm/arch.img,if=virtio,media=disk -monitor stdio" where /dev/hugepages is "hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,mode=1770,gid=78,pagesize=1G,pagesize=1G)" and the kernel is booted with "hugepagesz=1G hugepages=4". This result in lots of error message in dmesg, as seen here: https://gist.github.com/ajs124/6842823 (starting at 18:04:28) After starting and stopping multiple virtual machines, the hugepages seem to "fill up" and qemu outputs "file_ram_alloc: can't mmap RAM pages: Cannot allocate memory", but works anyways. With fill up, I mean that I can start qemu 2 time with "-m 2048" and 4 times with "-m 1024", before it fails to mmap. This works without any problems in 3.11.x and also with 2M hugepages (umount /dev/hugepages && mount -t hugetlbfs -o pagesize=2048k /dev/hugepages). I'm running this in arch linux and there has already been some discussion on the arch forums (https://bbs.archlinux.org/viewtopic.php?pid=1333469#p1333469) but I tried to add everything I wrote over there in this mail. In case I missed something or you need more information, I'll happily supply it in order to get this resolved. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
