[Bug 503138] Re: after kernel message hrtimer: interrupt too slow.... the kvm guest becomes slow [possible solution found!]

DJavaBean djavabean at gmail.com
Thu May 13 13:59:32 UTC 2010


Thanks for the update. I installed 10.04 just recently but have not tested
that functionality yet.

On Thu, May 13, 2010 at 5:17 AM, starslights <stars at hispeed.ch> wrote:

> Hello,
>
> I run kubuntu Lucid LVM 10.04 LTS on x86 64, fresh install and it's seem
> to be fixed, i don't get any more this warning
>
> Best regards
>
> Linux xxxxxxxx 2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:28:05 UTC
> 2010 x86_64 GNU/Linux
>
> --
> after kernel message  hrtimer: interrupt too slow.... the kvm guest becomes
> slow [possible solution found!]
> https://bugs.launchpad.net/bugs/503138
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” package in Ubuntu: Triaged
>
> Bug description:
> KVM Host is running a clean 9.10 server install with just qemu-kvm and
> virt-manager kernel=2.6.31-17-generic
> uname -a: Linux VMMASTER 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10
> 16:20:31 UTC 2009 i686 GNU/Linux
> version signature: Ubuntu 2.6.31-17.54-generic
>
> KVM Guest is running a clean 9.10 server install with some userland
> services (apache/postfix/whatnot) kernel=2.6.31-16-generic-pae (from the
> linux-image-virtual package)
> uname -a: Linux VM1 2.6.31-16-generic-pae #53-Ubuntu SMP Tue Dec 8 05:20:21
> UTC 2009 i686 GNU/Linux
> version signature: Ubuntu 2.6.31-16.53-generic-pae
>
> KVM guest startup command (as invoked by virt-manager):
> /usr/bin/kvm -S -M pc-0.11 -m 1024 -smp 2 -name lexx -uuid [UUID] -monitor
> unix:/var/run/libvirt/qemu/VM1.monitor,server,nowait -boot c -drive
> file=,if=ide,media=cdrom,index=2 -drive
> file=/var/lib/libvirt/images/VM1.img,if=virtio,index=0,boot=on -net
> nic,macaddr=[MAC],vlan=0,model=virtio,name=virtio.0 -net
> tap,fd=16,vlan=0,name=tap.0 -serial none -parallel none -usb -vnc
> 127.0.0.1:0 -k en-us -vga cirrus
>
> Problem description:
>
> After a while (and high network IO) I see this pop up in my guest dmesg:
>  hrtimer: interrupt too slow, forcing clock min delta to 215997540 ns
> after that the guest becomes very slow to respond, sometimes taking seconds
> to echo my ssh input back, on a local lan. Only a reboot of the kvm guest
> fixes this, until the dreaded hrtimer message pops up
>
> After a lot of googling and trying a lot of things I found this discussion
> on the patchwork kernel mailinglist, which contains a possible solution:
> http://patchwork.kernel.org/patch/51561/
>
> Please look into it, perhaps this solves a lot of kvm-users' problems
>
> I'd like to patch my kvm guests' kernel myself to test this hrtimer patch,
> do you have the correct procedure for me so i can create a custom kernel?
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/503138/+subscribe
>

-- 
after kernel message  hrtimer: interrupt too slow.... the kvm guest becomes slow [possible solution found!]
https://bugs.launchpad.net/bugs/503138
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