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[Xen-users] Re: HVM CPU usage 100% after the migration

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: HVM CPU usage 100% after the migration
From: cendhu <cendhu@xxxxxxxxx>
Date: Fri, 24 Sep 2010 18:22:22 +0530
Delivery-date: Fri, 24 Sep 2010 05:54:07 -0700
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Problem was due to the line "maxmem=2048" in the config file.

After removing this line, HVM's CPU usage is between 0 to 2%

But the maxmem is a valid option for HVM config file.

On Fri, Sep 24, 2010 at 3:25 PM, cendhu <cendhu@xxxxxxxxx> wrote:

   I am not running any application inside the HVM. But, after the migration, it always uses 100% cpu.

Xen : 4.0.1
Dom0: Ubuntu 10.04 Server & 2.6.32-bpo.4-xen-amd64
HVM : Ubuntu 10.04 Server 

Xentop Value before the Migration (Sample)

 NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS 
 Domain-0 -----r       6965      2.7            647168   15.7       no limit         n/a                 1   
 lucid_hvm -----r        567      0.5            2101220   50.9     2101248       50.9                1  

I am using the following command to perform the migration

$xm migrate --live lucid_hvm

Xentop Value after the Migration (Sample)

 NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS 
 Domain-0 -----r       3965      5.7            642163   15.7       no limit         n/a                 1   
 lucid_hvm -----r        569      100.0        2101220   50.9     2101248       50.9               1  

This is how HVM config file looks

   import os, re
   arch = os.uname()[4]
   kernel = "/usr/lib/xen/boot/hvmloader"
   memory = 2048
   shadow_memory = 8
  name = "lucid_hvm"
  vif = [ 'mac=00:B6:3E:E8:41:2E' ]
  disk = [ 'file:/vmimage/lucid_hvm.img,xvda,w', 'file:/vmimage/ubuntu-10.04.1-server-i386.iso,xvdc:cdrom,r' ]
  device_model = '/usr/lib/xen/bin/qemu-dm'
 on_reboot   = 'restart'
 on_crash    = 'restart'


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