Funny sleep behavior with 8.2-R/amd64 on Linux KVM

[Boris Kochergin]

Hi.

I have KVM running on a Linux machine:

# uname -a
Linux [censored] 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 
x86_64 x86_64 x86_64 GNU/Linux

I created it as follows:

virt-install --name [censored] --vcpus 2 --ram 2048 --disk 
path=/var/lib/libvirt/images/[censored]/[censored],size=10,sparse=false 
--cdrom=/xen/iso/FreeBSD-8.2-RELEASE-amd64-disc1.iso --network 
bridge:br0 --network bridge:br1 --vnc --noautoconsole --hvm --accelerate 
--os-variant=freebsd7 --os-type unix

Everything seems fine except one thing: it looks like the system, when 
asked to sleep, sleeps for three times as long as it was asked to:

# time sleep 1
0.000u 0.000s 0:03.02 0.0%      0+0k 0+0io 0pf+0w

This is also evident in increased top(1) update delays, delays between 
ping(8) sending packets, and so forth. Any thoughts?