On 07/16/2014 06:35 PM, Serge Hallyn wrote:
> To be clear, you have not yet gotten the bug since you've set > KSM_ENABLED to 0, or have you? I just did it, so no, not yet. This happened by time: Saucy (everything is fine) -> Trusty (issue happened) -> Trusty with Saucy kernel 3 weeks ago (no issue) -> today with 3 weeks uptime (issue happened) -> KSM_ENABLED=0 + reboot with Trusty kernel -> now I just want to be clear, that both of us understand the same on this. > Interesting about the saucy kernel. Ideally we could reproduce this > reliably enough to really bisect. > > I wonder if we can reproduce without qemu. I have a some other servers with LXC with no issue, If there is KVM, then issue happens. Does it really not show up anywhere else? sysctl.conf: kernel.printk = 3 4 1 3 net.ipv4.conf.default.rp_filter=1 net.ipv4.conf.all.rp_filter=1 net.ipv4.tcp_syncookies=1 net.ipv4.conf.all.secure_redirects = 1 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv6.conf.all.accept_source_route = 0 kernel.shmmax=335544320000 net.ipv4.tcp_rmem = 4096 16777216 33554432 net.ipv4.tcp_wmem = 4096 16777216 33554432 net.ipv4.tcp_mem = 4096 16777216 33554432 net.core.rmem_default = 16777216 net.core.wmem_default = 16777216 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.netdev_max_backlog = 30000 net.core.netdev_max_backlog = 30000 net.ipv6.neigh.default.gc_thresh1 = 512 net.ipv6.neigh.default.gc_thresh2 = 2048 net.ipv6.neigh.default.gc_thresh3 = 4096 vm.swappiness = 1 fs.inotify.max_user_watches = 81920 fs.inotify.max_user_instances = 1024 May that be important? tamas -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1341195 Title: KVM guests getting slow by time Status in “linux” package in Ubuntu: Incomplete Status in “qemu” package in Ubuntu: Incomplete Bug description: There is a post with very similar symptoms on serverfault: http://serverfault.com/questions/609881/windows-server-2012-on-kvm-on- ubuntu-14-04-runs-well-for-a-while-and-then-slows/612084#612084 Basically all kind of KVM guests are getting slow by time, both windows or linux. The more running guests, it happens sooner. Switching back to Saucy kernel is a good workaround. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: qemu-kvm 2.0.0+dfsg-2ubuntu1.1 ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2 Uname: Linux 3.13.0-29-generic x86_64 NonfreeKernelModules: zfs zunicode zavl zcommon znvpair ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 Date: Sat Jul 12 22:18:49 2014 SourcePackage: qemu UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1341195/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp