Strange MySQL behaviour

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Hello!

I am using Fedora 14 with kernel and qemu-kvm from Fedora 15:
[root@serv ~]# qemu-kvm --help | head -1
QEMU emulator version 0.14.0 (qemu-kvm-0.14.0), Copyright (c)
2003-2008 Fabrice Bellard
[root@serv ~]# uname -a
Linux serv 2.6.38.8-35.fc15.x86_64 #1 SMP Wed Jul 6 13:58:54 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux

I have a guest with latest CentOS6:
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun
27 19:49:27 BST 2011 x86_64 x86_64 x86_64 GNU/Linux

When I try to load a small MySQL database dump (nearly 10k lines), it
loads a lot of time.
Guest cpu states:
Cpu(s):  0.3%us,  0.6%sy,  0.0%ni, 61.9%id, 37.2%wa,  0.0%hi,  0.0%si,  0.0%st
MySQL Processlist:
mysql> show full processlist;
+----+------+-----------+--------+---------+------+---------------+------------------------------------------------------------+
| Id | User | Host      | db     | Command | Time | State         |
Info                                                       |
+----+------+-----------+--------+---------+------+---------------+------------------------------------------------------------+
|  4 | root | localhost | NULL   | Query   |    0 | NULL          |
show full processlist                                      |
| 11 | root | localhost | zabbix | Query   |    0 | freeing items |
INSERT INTO applications VALUES (41,10002,'Performance',0) |
Guest top:
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1330 mysql     20   0  560m  29m 5900 S  1.3  6.0   0:05.61 mysqld
  336 root      20   0     0    0    0 D  0.7  0.0   0:02.39 kdmflush
 1367 root      20   0 14928 1212  924 S  0.7  0.2   0:08.42 top
  355 root      20   0     0    0    0 D  0.3  0.0   0:03.34
jbd2/dm-0-8
 1421 root      20   0 14932 1220  920 R  0.3  0.2   0:00.01 top

Guest is installed inside LVM.

Host cpu states:
Cpu(s):  2.3%us,  4.0%sy,  0.0%ni, 93.1%id,  0.4%wa,  0.0%hi,  0.1%si,  0.0%st

QEMU command:
/usr/bin/qemu-kvm -enable-kvm -name VM7 -nographic -vnc 0.0.0.0:7 -vga
std -m 512 -smp 4 -boot c -pidfile /home/vms/run/7.pid -monitor
unix:/home/vms/run/7.monitor,server,nowait -serial
unix:/home/vms/run/7.serial,server,nowait -net
nic,vlan=0,macaddr=FE:E1:DE:AD:00:07,model=virtio -net
tap,vlan=0,ifname=tap_7_0,script=/home/vms/ifup,downscript=/home/vms/ifdown
-drive media=disk,if=virtio,index=0,file=/dev/vg0/cent6,cache=none,boot=on

I can provide any additional debug information.

What is the reason of this behaviour?

-- 
Boris Dolgov.
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