Re: [OpenNode-users] KVM Missing timer interrupts?

[<ope...@li...>]

Hi Juilán,

Please disable in /etc/yum.repos.d/opennode opennode repo and enable 
opennode-test repo - then do yum update opennode and let it update to 
newer ovzkernel and kvm module (and reboot system afterwords to load new 
kernel) - see if it fixes your problems. But keep in mind that there can 
be other problems with opennode-test repo package versions - so avoid it 
doing on production servers.

All the best,

----------------------------------------------
Andres Toomsalu, an...@ac...




ope...@li... wrote:
> Hello,
>
> I have a working OpenVZ installation, and recently installed the kvm
> packages from opennode. I managed to install 2 VMs, one with WinXP and
> another with Win2003, both 32bits.
>
> The problem is that the guests slows down when there is no network
> traffic, and recovers when I, for example, ping flood the guest IP
> address.
>
> I don't know the cause, but it would seem that the guest is not
> getting timer interrupts, and can only keep up when there is another
> source of interrupts (network traffic).
>
> Hardware Node:
>
> # cat /proc/cpuinfo
> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 23
> model name	: Intel(R) Xeon(R) CPU           E5405  @ 2.00GHz
> stepping	: 10
> cpu MHz		: 2000.028
> cache size	: 6144 KB
> physical id	: 0
> siblings	: 4
> core id		: 0
> cpu cores	: 4
> apicid		: 0
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 13
> wp		: yes
> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm
> constant_tsc pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
> bogomips	: 4000.05
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 38 bits physical, 48 bits virtual
> power management:
>
> (There are 8 cores in total.)
>
> #uname -a
> Linux ns21xxxx.ovh.net 2.6.18-194.3.1.el5.028stab069.5 #1 SMP Tue May
> 18 17:48:31 MSD 2010 x86_64 x86_64 x86_64 GNU/Linux
>
> # rpm -qa | grep kvm
> etherboot-zroms-kvm-5.4.4-13.el5.centos
> kmod-kvm-83-164.asys.8
> kvm-83-164.asys.8
> kvm-qemu-img-83-164.asys.8
> kvm-tools-83-105.asys.22.4
>
> Guest xml config:
> <domain type='kvm'>
>   <name>WinXP</name>
>   <uuid>7f119fd1-bbf3-64f6-17d5-e5263b6a1502</uuid>
>   <memory>1048576</memory>
>   <currentMemory>1048576</currentMemory>
>   <vcpu>1</vcpu>
>   <os>
>     <type arch='x86_64' machine='pc'>hvm</type>
>     <boot dev='hd'/>
>   </os>
>   <features>
>     <acpi/>
>     <pae/>
>   </features>
>   <clock offset='localtime'/>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>restart</on_crash>
>   <devices>
>     <emulator>/usr/libexec/qemu-kvm</emulator>
> [...] The rest is trivial, ide HD (raw image), ide cdrom, and e1000 network.
>
> I initially installed XP with 2 vCPU. Changed it to 1 after reading
> some posts regarding clock drifts... Didn't fix it, anyway.
>
>
> This is the cmd line:
> /usr/libexec/qemu-kvm -S -M pc -m 1024 -smp 1 -name WinXP -uuid
> 7f119fd1-bbf3-64f6-17d5-e5263b6a1502 -no-kvm-pit-reinjection -monitor
> pty -pidfile /var/run/libvirt/qemu//WinXP.pid -localtime -boot c
> -drive file=/home/KVM/WinXPVM.img,if=ide,index=0,boot=on,format=raw
> -drive file=/home/KVM/NetKVM-and-viostor.iso,if=ide,media=cdrom,index=2,format=raw
> -net nic,macaddr=52:54:00:6a:d4:af,vlan=0,model=e1000 -net
> tap,fd=15,script=,vlan=0,ifname=vnet0 -serial pty -parallel none -usb
> -vnc 127.0.0.1:0
>
>
>
> Any idea on why it is happening?
>
> Thanks in advance,
>     Juilán J. M.
>
>