Busy zimbra - Busy selector - injecting delay

[maxxer]

Hi.
I've recently installed 7.1.1_GA_3196.UBUNTU10_64 but I noticed java is working too much on this machine (an Ubuntu Paravirtualized Xen VM. But I installed on vm before, without issues).

In mailbox.log I found the following:

[btpool0-6 - Acceptor1 SslSelectChannelConnector@0.0.0.0:7071] [] log - org.mortbay.io.nio.SelectorManager$SelectSet@7766d1da Busy selector - injecting delay 13 times
[btpool0-6 - Acceptor1 SslSelectChannelConnector@0.0.0.0:7071] [] log - org.mortbay.io.nio.SelectorManager$SelectSet@7766d1da JVM BUG(s) - recreating selector 5 times, canceled keys 965 times

almost every 10 seconds I get messages like these.
I have another 7.1.1 running, without these issues.

Any idea?
thanks