Bugs item #2019053, was opened at 2008-07-15 18:10 Message generated for change (Comment added) made by alex_williamson You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2019053&group_id=180599
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: amd Group: None >Status: Open Resolution: None Priority: 5 Private: No Submitted By: Alex Williamson (alex_williamson) Assigned to: Nobody/Anonymous (nobody) Summary: tbench fails on guest when AMD NPT enabled Initial Comment: Running on a dual-socket system with AMD 2356 quad-core processors (8 total cores), 32GB RAM, Ubuntu Hardy 2.6.24-19-generic (64bit) with kvm-71 userspace and kernel modules. With no module options, dmesg confirms: kvm: Nested Paging enabled Start guest with: /usr/local/kvm/bin/qemu-system-x86_64 -hda /dev/VM/Ubuntu64 -m 1024 -net nic,model=e1000,mac=de:ad:be:ef:00:01 -net tap,script=/root/bin/br0-ifup -smp 8 -vnc :0 Guest VM is also Ubuntu Hardy 64bit. On the guest run 'tbench 16 <tbench server>'. System running tbench_srv is a different system in my case. The tbench client will fail randomly, often quietly with "Child failed with status 1", but sometimes more harshly with a glibc double free error. If I unload the modules and reload w/o npt: modprobe -r kvm-amd modprobe -r kvm modprobe kvm-amd npt=0 dmesg confirms: kvm: Nested Paging disabled The tbench test now runs over and over successfully. The test also runs fine on an Intel E5450 (no EPT). ---------------------------------------------------------------------- >Comment By: Alex Williamson (alex_williamson) Date: 2008-07-16 09:18 Message: Logged In: YES user_id=333914 Originator: YES No, I added mlockall(MCL_CURRENT | MCL_FUTURE) to qemu/vl.c:main() and it makes no difference. I'm only starting a 1G guest on an otherwise idle 32G host, so host memory pressure is pretty light. ---------------------------------------------------------------------- Comment By: Avi Kivity (avik) Date: 2008-07-16 08:19 Message: Logged In: YES user_id=539971 Originator: NO Strange. If you add an mlockall() to qemu startup, does the test pass? ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2019053&group_id=180599 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
