[fedora-virt] Virt Disk Performance

[Ken Smith]

Hi, I have two virtual machine setups, one is FC13 and the other is 
FC14, using kvm and guests created using the Virtual Machine Manager.

I have noticed that the disk performance is slower than I would have 
expected. Here are some figures

FC14 Host (i7, 8Gb memory, Two 1Tb sata disks in soft Raid0)

     Host, 9.76 MBytes/Sec

     Centos 5.6 Guest, 6.45 MBytes/Sec

     RedHat 8 Guest, 0.426 Mbytes/Sec


FC13 Host (i7, 4Gb Memory, One 1Tb sata disk)

     Host, 47.6 MBytes/Sec

     Centos 5.6 Guest, 12.52 MBytes/Sec

     RedHat 7.3 Guest, 1.42 MBytes/Sec

     FC6 Guest, 16 MBytes/Sec

     Centos 6 Guest, 15.72 MBytes/Sec

The tests were run by copying large files (650 Mbytes) and timing the 
result.

I didn't expect the legacy 2.4 kernel guests to perform so slowly.

The performance of the soft raid0 host machine is disappointing.

On the FC13 host, without Raid, the guest performance at 1/3 of the host 
is also a surprise.

What experience and guidance is out there on this area?

Many thanks

Ken






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