Тормозит звук в qemu-kvm

ОС: 3.3.8-gentoo x86_64
Версия qemu-kvm: 1.1.1-r1
Опции сборки: USE="aio alsa caps curl ncurses opengl sdl vhost-net"
Версия alsa-lib: 1.0.25-r1
SDL: media-libs/libsdl-1.2.15-r2  USE="X alsa audio joystick opengl video"

Опции запуска qemu-kvm:
qemu-system-i386 -monitor stdio -localtime -enable-kvm -soundhw ac97 \
                 -cpu kvm32 -machine pc,accel=kvm \
                 -cdrom file.iso -m 512 -boot d windows_xp.img

Проблема: тормозит звук в виртуальной машине.

Выхлоп qemu-kvm:
audio: Failed to create voice `ac97.pi'
audio: Failed to create voice `ac97.mc'
audio: Failed to create voice `ac97.pi'
audio: Failed to create voice `ac97.mc'
audio: Failed to create voice `ac97.pi'
audio: Failed to create voice `ac97.pi'
audio: Failed to create voice `ac97.pi'
audio: Failed to create voice `ac97.pi'
........................
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred