Hi,

Friends after installing ubuntu inside my virtualbox, I noticed that everything is slower inside my vm. Is that normal for a vm..?

I assigned 8 GB virtual harddrive and 1 GB RAM.. for my vm...anything more it need??

Hi,

Slower than what? If you mean slower than bare metal, then yes. What benchmarks did you use for the comparison? What results did you get?

Evo2.

Hi,

I mean, my virtual machine works very slowly....when I compare it with host....! Is that normal?

---------- Post added 04-01-13 at 04:43 AM ----------

Hi,

I mean, my virtual machine works very slowly....when I compare it with host....! Is that normal?

Hi,

what does "very slowly" mean? And what in particular? If you are talking about 3D graphics, then yes, if you are talking about simple floating point calculations, then I'd say no.

Evo2.

In general it is normal that virtualized system works slower, it need additional steps to accomplish the same task like on non virtualized hardware. However, it all depends on your real hardware and settings, and if you have decent hardware you should not notice decreased performance.

1GB should suffice for Ubuntu, but 3D games or more complicated applications need more. Be sure not to assign more than about 90% of your real free RAM to virtual machine, your real system still needs RAM to operate and if it consume too much it will start to use swap, that will decrase performance of both systems. Check settings of your virtual machine like: hardware virtualization (VT-x/AMD-V), Nested paging, IO APIC, 3D Acceleration. Without these setting you can get performance penalty. Also make sure you installed "Guest Additions" - available on Device menu after starting virtual system.

Also you did not mentioned what hardware, host and guest system you have: 32 or 64bit and which versions.

Hi,

Thanks for your prompt reply

I am not able to catch up "guest additions" option you just said...Please explain it little more...

Mine host is Debian (squeeze), and I installed Ubuntu 12.1x in virtual box... my cpu is dual core and my ram is 2 GB...

When you start virtual system you should see in "Devices" menu (it is visible on windowed mode or slided from bottom when you move cursor there), shortcut is HostKey+D. Read the whole manual of installing guest additions.

With 2GB RAM it may be difficult to satisfy both systems. Check how many free RAM you have on both systems after starting virtual machine. You can view it by issuing command "free -m".

You have dual core CPU but it is 32 or 64bit and your systems are 32 or 64 bit?

Mine is 32 bit processor...

The information about your processor is not sufficient for us to help you. Please post the output of If you have a 32 bit dual-core CPU (most like a Core Duo or Pentium D) then you most likely do not have hardware support for virtualization. That would be the cause for slow running VMs, but as said above, we need more information.

cot@boss:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Pentium(R) Dual-Core CPU T4500 @ 2.30GHz
stepping : 10
cpu MHz : 1200.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
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 pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts
bogomips : 4588.74
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Pentium(R) Dual-Core CPU T4500 @ 2.30GHz
stepping : 10
cpu MHz : 1200.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
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 pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts
bogomips : 4588.45
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

The T4200 (which by the way is a 64 bit CPU) does not have support for hardware virtualization, so that you get slow VMs is absolutely normal on this hardware.