On 09/05/2013 04:43 AM, Sergius ssi. Siczek - sysGen GmbH wrote:
HI guys,
I have got a problem with the IO performance of my kvm nodes.
One kvm node is setup up on a kvmhost. This host has got an nfs mount
from the mgmt node.
If I do a throughput test on this nfs share, I get ~ 112 MB/s. But
within the kvm node I just get 11 MB/s.
The one thing I did to help with IO performance was to disable the
driver cache in kvm.pm
@@ -467,6 +481,7 @@ sub build_diskstruct {
$tdiskhash->{device}='disk';
$tdiskhash->{driver}->{name}='qemu';
$tdiskhash->{driver}->{type}=$disks{$_}->{format};
+ $tdiskhash->{driver}->{cache}="none"; # local GN
change for EL6
$tdiskhash->{source}->{file}=$_;
$tdiskhash->{target}->{dev} = $disks{$_}->{device};
if ($disks{$_} =~ /^vd/) {
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