Without patch, with a latency of 48 ms:
4.80% lt-pulseaudio [kernel.kallsyms] [k] __do_softirq
2.43% alsa-sink-USB A [snd_pcm] [k] snd_pcm_hwsync
2.32% lt-pulseaudio [kernel.kallsyms] [k]
finish_task_switch.isra.60
2.27% alsa-sink-USB A [snd_pcm] [k]
snd_pcm_playback_poll
2.24% lt-pulseaudio [kernel.kallsyms] [k]
__usb_hcd_giveback_urb
1.57% lt-pulseaudio [kernel.kallsyms] [k] fget_light
1.26% alsa-sink-USB A libalsa-util.so [.] thread_func
1.13% alsa-sink-USB A [kernel.kallsyms] [k] do_sys_poll
1.11% alsa-sink-USB A [kernel.kallsyms] [k] fget_light
0.91% alsa-sink-USB A [kernel.kallsyms] [k] eventfd_write
0.89% lt-pulseaudio [kernel.kallsyms] [k] do_sys_poll
0.87% lt-pulseaudio [kernel.kallsyms] [k] datagram_poll
0.81% alsa-sink-USB A libpulsecore-5.0.so [.] pa_rtpoll_run
0.79% alsa-sink-USB A [snd_pcm] [k]
snd_pcm_sync_ptr
0.78% lt-pulseaudio [kernel.kallsyms] [k] sock_poll
0.77% lt-pulseaudio [kernel.kallsyms] [k]
__wake_up_sync_key
0.74% alsa-sink-USB A [snd_pcm] [k] snd_pcm_status
0.74% lt-pulseaudio [kernel.kallsyms] [k] pipe_read
0.69% lt-pulseaudio libpulse.so.0.17.3 [.]
pa_mainloop_dispatch
0.68% alsa-sink-USB A [kernel.kallsyms] [k] __do_softirq
0.59% alsa-sink-USB A ld-2.18.so [.] __tls_get_addr
0.59% alsa-sink-USB A libpulsecore-5.0.so [.] inputs_drop
0.58% lt-pulseaudio libpulse.so.0.17.3 [.]
pa_mainloop_prepare
0.56% alsa-sink-USB A libpulsecommon-5.0.so [.]
pa_memblock_unref
0.56% alsa-sink-USB A [kernel.kallsyms] [k] vector_swi
0.55% alsa-sink-USB A [kernel.kallsyms] [k]
__copy_to_user_memcpy
0.55% alsa-sink-USB A libpulsecore-5.0.so [.]
pa_object_check_type
0.54% alsa-sink-USB A libpulsecore-5.0.so [.]
pa_sink_input_peek
0.53% lt-pulseaudio [kernel.kallsyms] [k] eventfd_write
0.52% lt-pulseaudio [kernel.kallsyms] [k] vector_swi
0.51% lt-pulseaudio [kernel.kallsyms] [k]
unix_stream_recvmsg
With the patch, I get the same assertion failed as Peter ("frames > 0").
With Peter's change, I get this: http://pastebin.com/dWx6fiwT, even with
no client connected. The reported delay is -5 * default-fragments *
default-fragment-size-msec.
Laurentiu
On Tue, Sep 30, 2014, at 11:11, Alexander E. Patrakov wrote:
> 30.09.2014 12:43, David Henningsson wrote:
> >
> >
> > On 2014-09-29 16:33, Lauren?iu Nicola wrote:
> >> If nobody tried it, I might test the patch on my USB DAC. The problem is
> >> that I'm not sure what's the best way to benchmark the playback. Do you
> >> have some tips on that?
> >
> > Run "top" in a low-latency playback scenario, that should be enough. You
> > might want to verify (e g with pactl) that you end up with the same
> > latency both with and without the patch.
> >
> > Maybe others have more accurate methods to measure CPU consumption.
>
> I used "perf". Please see this message:
>
> http://lists.freedesktop.org/archives/pulseaudio-discuss/2014-September/021745.html
>
> If others also try this method, we may be able to compare the results.
>
> --
> Alexander E. Patrakov
