<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - severe underruns with usb audio, works with pa 3.0 - buffer setup seems wrong" href="https://bugs.freedesktop.org/show_bug.cgi?id=86262#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - severe underruns with usb audio, works with pa 3.0 - buffer setup seems wrong" href="https://bugs.freedesktop.org/show_bug.cgi?id=86262">bug 86262</a> from <a class="email" href="mailto:freedesktop-bugzilla@dm.cobite.com" title="David Mansfield <freedesktop-bugzilla@dm.cobite.com>"> David Mansfield</a> <pre>Created <a href="attachment.cgi?id=109438" name="attach_109438" title="force tsched even in "BATCH" mode and on KVM.">attachment 109438</a> <a href="attachment.cgi?id=109438&action=edit" title="force tsched even in "BATCH" mode and on KVM.">[details]</a> <a href='page.cgi?id=splinter.html&bug=86262&attachment=109438'>[review]</a> force tsched even in "BATCH" mode and on KVM. The attached patch fixes the problem by essentially reversing commit 826c8f69d34ef49e86fe0ab6c93c1ffba8916131 (alsa: Disable timer-scheduling for PCMs with the BATCH flag). Without tsched, the buffers are miniscule and we get overruns constantly. With tsched (by design) the buffers are huge. Not sure what the implications are. NOTE: I also forced enablement of tsched on KVM. I'm having the exact same problem in a VM, and it is MUCH better with the patch although still not "glitch-free" which it is (with the patch) on bare-metal. NOTE: In kvm I am using USB passthrough, not emulated hardware audio device.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>