Re: Clock jumps

On 28.05.2010 02:00, john stultz wrote: Hi John, Looking at the diff: --- dmesg-lenny 2010-05-27 16:45:33.0 -0700 +++ dmesg-squeeze 2010-05-27 16:46:14.0 -0700 @@ -132,8 +132,8 @@ console [ttyS1] enabled hpet clockevent registered Fast TSC calibration using PIT -Dete

Re: Clock jumps

On 27.05.2010 23:53, Zachary Amsden wrote: Hello Zachary, I have server side fixes for this kvm-clock which seem to give me a stable clock on this machine, but for true SMP stability, you will need Glauber's guest side changes to kvmclock as well. It is impossible to guarantee strictly monotoni

Re: Clock jumps

On 27.05.2010 21:08, john stultz wrote: Hi John, I'd be very interested in hearing more about the host side issue. So this happened with the same kernel that you were using before, with no trouble? Correct. Could you also send dmesg output from this boot? And if you can find any older dmesg

Re: Clock jumps

Alexander Graf wrote: Hi, > Do you have ntpd running inside the guest? I have a bug report lying > around about 2.6.33 with kvm-clock jumping in time when ntpd is used: > https://bugzilla.novell.com/show_bug.cgi?id=582260 I want to chime in here, I have a very similar problem, but not with ntpd

hugetlbfs and KSM

Hi, running Debian Squeeze with a 2.6.32-3-amd64 kernel and qemu-kvm 0.12.3 I enabled hugetlbfs on a rather small box with about five similar VMs today (all Debian Squeeze amd64, but different services) Pro: * system load on the host has gone way down (by about 50%) Contra: * KSM seems to be lar

Re: linux-aio usable?

On Mon, Mar 08, 2010 at 11:10:29AM +0200, Avi Kivity wrote: > >Are there any potential pitfalls? > It won't work well unless running on a block device (partition or LVM). What does "work well" mean in this context? Potential dataloss? > >Is there any reason one should not compile that feature by

linux-aio usable?

Hi, sorry for this pretty generic question, I did not find any real pros and cons on the net anywhere, but I might just have missed them. In a pure x86_64 environment (~2.6.32 vanilla kernel, 0.12.3 qemu-kvm), is enabling linux-aio in KVM a good idea? What are the advantages/disadvantages? Are th

Re: virtio GSO makes IPv6 unbearably slow

On Mon, Feb 01, 2010 at 10:08:53PM -0800, Sridhar Samudrala wrote: > >According to ethtool GSO is enabled on the guest, but disabling it using > >ethtool does not have any effect. But giving the kernel > >"virtio_net.gso=0" in append fixes the issue completely. > > > >Anyone having any ideas? > >

virtio GSO makes IPv6 unbearably slow

Hi, I have a really weird issue all of the sudden on _one_ of my two KVM hosts. The other one, while running on a different hardware in a different network, is configured in a very similar way and does not show these issues (so far). Host: - AMD Athlon64 3500+ - Debian testing amd64 - Kernel 2.6.

Re: kvm hangs when rebooting a guest VM

Bernhard Schmidt <[EMAIL PROTECTED]> wrote: > I have a small but annoying issue. > > Host: > * AMD Athlon64 > * Debian Lenny, Kernel 2.6.26-1-amd64 > * kvm-72 (Debian package) or kvm-76 (self-built) > > Guest: > * monolithic vanilla 2.6.26, KVM_GUEST and KVM

kvm hangs when rebooting a guest VM

Hello, I have a small but annoying issue. Host: * AMD Athlon64 * Debian Lenny, Kernel 2.6.26-1-amd64 * kvm-72 (Debian package) or kvm-76 (self-built) Guest: * monolithic vanilla 2.6.26, KVM_GUEST and KVM_CLOCK, VIRTIO for both block device and NIC * various Debian and Ubuntu versions I don't

Re: virtio performance issue

Ben-Ami Yassour <[EMAIL PROTECTED]> wrote: Hello Ben, > I am running virtio with the latest KVM code, and see a significant > performance issue. > > Ping to the host (or any other close machine) reports a 4ms delay. > > In the same setup with an e1000 emulation (just changing model=virtio to > mo

Re: Freeze with KVM_CLOCK, undocumented dependency VIRTIO_BLK -> VIRTIO_PCI

Hi, a) when I enable KVM_CLOCK in the kernel configuration the guest system freezes after PCI: Found IRQ 11 for device :00:04.0 vda: vda1 vda2 TCP cubic registered NET: Registered protocol family 10 NET: Registered protocol family 17 Using IPI Shortcut mode There are some outstanding patc

Freeze with KVM_CLOCK, undocumented dependency VIRTIO_BLK -> VIRTIO_PCI

Hi, apologies if those questions have already been answered, I did not find anything specific that should still be visible. I'm currently testing KVM (kvm-0.70 package from Debian unstable, rebuilt on Ubuntu Hardy) on a Athlon64 in i386 mode and found two small issues while trying to build a smal