Red Hat Bugzilla – Bug 519540
qemu slows down dramatically using the SDL graphics backend and ac97 sound driver
Last modified: 2010-06-28 10:19:19 EDT
Created attachment 358794 [details]
Example kickstart file.
Description of problem:
Qemu freezes with ac97 sound emulation.
Version-Release number of selected component (if applicable):
Just load into qemu with -soundhw ac97 some fedora livecd. And wait for some time. Maybe it was sooner, maybe not but about 5 minutes virtual machine freezes, so when you move mouse it looks like slideshow.
Steps to Reproduce (example):
1.Create livecd with kickstart in attachment.
2.Type "export QEMU_AUDIO_DRV=pa" in console, where you want to run qemu. It is necessary for working sound. Without it qemu writes "audio: Failed to create voice `ac97.pi'" and sound does not work.
3.Load it into qemu with command "qemu-kvm -m 320 -vga std -soundhw ac97 -cdrom livecd-fedora-kde-cepreu.iso". (you must be superuser, of course)
4.Wait for some time.
Guest OS works veeeeeeery slow after some time.
It must not be slow motion picture.
1. It not only with one cd. I checked Fedora 10 custom made livedvd, and Fedora 7 also. Problem still here.
2. If use "-soundhw es1370", all works fine.
I'm pushing this change to updates-testing, so you shouldn't need to use QEMU_AUDIO_DRV=pa anymore
* Fri Sep 4 2009 Mark McLoughlin <firstname.lastname@example.org> - 2:0.10.6-4
- Make pulseaudio the default audio backend (#519540, #495964, #496627)
I think I can reproduce what you're seeing with the SDL graphics backend, but it seems to work fine with VNC
Could you confirm that the problem goes away if you run with e.g. '-vnc :1' (and running 'vncviewer localhost:1') ?
Yes, i confirm. Problem goes away.
Thanks for confirming
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