btw, I tried the latency.c app in polling mode too (./latency -P
plughw:0 -C plughw:0 -f S16_LE -c 1 -r 8000 -m 320 -M 960 -s 600 -p)
with same "spiking" results.
Further hints?
On 4/13/07, Giovanni Maruzzelli <gmaruzz.lists@xxxxxxxxx> wrote:
> I applied the first hint from Jaroslav (at the end of this post the
> new asound.conf), but the problem seems not gone: one time each 256
> seconds I get a very strong cpu load spike, that is maybe related (my
> guess) to the usage of plugin (maybe periodic cleaning each 256
> secs?). When there is no spike, the cpu load is 0.0% with occasional
> 0.1% any 60-90 secs.
>
> I ran the latency test code with plughw:0 (I can't use latency.c with
> my virtual cards because they can't link the in and out togheter)
> using the blocking mode, real time, no poll. Any 256 secs, spike! (a
> cpu load for latency.c of 45.00%, for roughly a sec, with the
> cumulated cpu time of the latency.c app reported from top -d 1.0
> passing from:
> 0:00.01
> to:
> 0:00.64
> to:
> 0:01.26
> etc, any 256 seconds.
>
>
> latency.c output:
>
> ./latency -P plughw:0 -C plughw:0 -f S16_LE -c 1 -r 8000 -m 320 -M
> 960 -s 600 -b
> Playback device is plughw:0
> Capture device is plughw:0
> Parameters are 8000Hz, S16_LE, 1 channels, blocking mode
> Wanted tick time: 0us, poll mode: no
> Loop limit is 4800000 frames, minimum latency = 320, maximum latency = 960
> Plug PCM: Route conversion PCM (sformat=S32_LE)
> Transformation table:
> 0 <- 0
> 1 <- 0
> 2 <- 0
> 3 <- 0
> 4 <- 0
> 5 <- 0
> 6 <- 0
> 7 <- 0
> 8 <- 0
> 9 <- 0
> Its setup is:
> stream : PLAYBACK
> access : RW_INTERLEAVED
> format : S16_LE
> subformat : STD
> channels : 1
> rate : 8000
> exact rate : 8000 (8000/1)
> msbits : 16
> buffer_size : 320
> period_size : 160
> period_time : 20000
> tick_time : 10000
> tstamp_mode : NONE
> period_step : 1
> sleep_min : 0
> avail_min : 160
> xfer_align : 1
> start_threshold : 2147483647
> stop_threshold : 320
> silence_threshold: 0
> silence_size : 0
> boundary : 1342177280
> Slave: Hardware PCM card 0 'M Audio Delta 1010LT' device 0 subdevice 0
> Its setup is:
> stream : PLAYBACK
> access : MMAP_INTERLEAVED
> format : S32_LE
> subformat : STD
> channels : 10
> rate : 8000
> exact rate : 8000 (8000/1)
> msbits : 24
> buffer_size : 320
> period_size : 160
> period_time : 20000
> tick_time : 10000
> tstamp_mode : NONE
> period_step : 1
> sleep_min : 0
> avail_min : 160
> xfer_align : 1
> start_threshold : 2147483647
> stop_threshold : 320
> silence_threshold: 0
> silence_size : 0
> boundary : 1342177280
> Plug PCM: Route conversion PCM (sformat=S32_LE)
> Transformation table:
> 0 <- 0*0.0833333 + 1*0.0833333 + 2*0.0833333 + 3*0.0833333 +
> 4*0.0833333 + 5*0.0833333 + 6*0.0833333 + 7*0.0833333 + 8*0.0833333 +
> 9*0.0833333 + 10*0.0833333 + 11*0.0833333
> Its setup is:
> stream : CAPTURE
> access : RW_INTERLEAVED
> format : S16_LE
> subformat : STD
> channels : 1
> rate : 8000
> exact rate : 8000 (8000/1)
> msbits : 16
> buffer_size : 320
> period_size : 160
> period_time : 20000
> tick_time : 10000
> tstamp_mode : NONE
> period_step : 1
> sleep_min : 0
> avail_min : 160
> xfer_align : 1
> start_threshold : 2147483647
> stop_threshold : 320
> silence_threshold: 0
> silence_size : 0
> boundary : 1342177280
> Slave: Hardware PCM card 0 'M Audio Delta 1010LT' device 0 subdevice 0
> Its setup is:
> stream : CAPTURE
> access : MMAP_INTERLEAVED
> format : S32_LE
> subformat : STD
> channels : 12
> rate : 8000
> exact rate : 8000 (8000/1)
> msbits : 24
> buffer_size : 320
> period_size : 160
> period_time : 20000
> tick_time : 10000
> tstamp_mode : NONE
> period_step : 1
> sleep_min : 0
> avail_min : 160
> xfer_align : 1
> start_threshold : 2147483647
> stop_threshold : 320
> silence_threshold: 0
> silence_size : 0
> boundary : 1342177280
> Trying latency 320 frames, 40000.000us, 40.000000ms (25.0000Hz)
> Success
> Playback:
> *** frames = 4800320 ***
> state : RUNNING
> trigger_time: 1176471431.639255951
> tstamp : 1176472031.482713139
> delay : 317
> avail : 3
> avail_max : 192
> Capture:
> *** frames = 4800000 ***
> state : RUNNING
> trigger_time: 1176471431.639255951
> tstamp : 1176472031.482757926
> delay : 1
> avail : 1
> avail_max : 189
> Maximum read: 160 frames
> Maximum read latency: 20000.000us, 20.000000ms (50.0000Hz)
> Hardware sync
> Playback time = 1176471431.639255, Record time = 1176471431.639255, diff = 0
>
> new asound.conf:
>
> pcm.c3 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 2
> }
> }
> pcm.capt3 {
> type plug
> slave.pcm c3
> }
>
> pcm.c4 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 3
> }
> }
> pcm.capt4 {
> type plug
> slave.pcm c4
> }
>
>
> pcm.c5 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 4
> }
> }
> pcm.capt5 {
> type plug
> slave.pcm c5
> }
>
>
> pcm.c6 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 5
> }
> }
> pcm.capt6 {
> type plug
> slave.pcm c6
> }
>
> pcm.c7 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 6
> }
> }
> pcm.capt7 {
> type plug
> slave.pcm c7
> }
>
>
> pcm.c8 {
> type dsnoop
> ipc_key 56789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 12
> format S32_LE
> }
> bindings {
> 0 7
> }
> }
> pcm.capt8 {
> type plug
> slave.pcm c8
> }
>
> #############################
> #############################
>
> pcm.s3 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 2
> }
> }
> pcm.play3 {
> type plug
> slave.pcm s3
> }
>
> pcm.s4 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 3
> }
> }
> pcm.play4 {
> type plug
> slave.pcm s4
> }
>
> pcm.s5 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 4
> }
> }
> pcm.play5 {
> type plug
> slave.pcm s5
> }
>
> pcm.s6 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 5
> }
> }
> pcm.play6 {
> type plug
> slave.pcm s6
> }
>
> pcm.s7 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 6
> }
> }
> pcm.play7 {
> type plug
> slave.pcm s7
> }
>
>
> pcm.s8 {
> type dshare
> ipc_key 123456789
> slave {
> pcm "hw:0,0"
> rate 8000
> period_time 0
> period_size 320
> channels 10
> format S32_LE
> }
> bindings {
> 0 7
> }
> }
> pcm.play8 {
> type plug
> slave.pcm s8
> }
>
>
>
>
>
>
>
>
>
> On 4/13/07, Giovanni Maruzzelli <gmaruzz.lists@xxxxxxxxx> wrote:
> > Thanks a lot Jaroslav, I'll apply your suggestions and I'll report here
> >
> > On 4/13/07, Jaroslav Kysela <perex@xxxxxxx> wrote:
> > > On Fri, 13 Apr 2007, Giovanni Maruzzelli wrote:
> > >
> > > > Dear Alsa developers,
> > > >
> > > > I want to use a 1010lt (ice1712 driver) as 6 analog mono duplex cards.
> > > >
> > > > I want to use the /etc/asound.conf (.asoundrc) to split the card (that
> > > > has 8 in and 8 out - but I use just 6 in/out), with minimal latency.
> > > >
> > > > I mean, I want to record and play (duplex) from/to each virtual card
> > > > concurrently and from separate application instances.
> > > >
> > > > My app works with S16_LE, 8000, mono.
> > > >
> > > > Is the following asound.conf (.asoundrc) correct and efficient for this?
> > >
> > > Use dsnoop bindings rather than routing (ttable) for capture too,
> > > otherwise alsa-lib works with all channels internally.
> > >
> > > > I got spikes of cpu load (at 5-6%) on each virtual card any roughly
> > > > 256 seconds when using a(play|record) to record or play from/to any
> > >
> > > aplay|arecord is not very good test. Use latency test code - available in
> > > alsa-lib/test directory.
> > >
> > > Jaroslav
> > >
> > > -----
> > > Jaroslav Kysela <perex@xxxxxxx>
> > > Linux Kernel Sound Maintainer
> > > ALSA Project, SUSE Labs
> > >
> >
>
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