Re: [RFC PATCH 0/5] softirq: Per vector threading v2

From: Mauro Carvalho Chehab
Date: Wed Jan 17 2018 - 11:57:16 EST

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Em Tue, 16 Jan 2018 05:40:35 +0100
Frederic Weisbecker <frederic@xxxxxxxxxx> escreveu:

> So this set is in a testable state. I addressed preliminary reviews from
> Eric Dumazet, Paolo Abeni and Linus.
>
> You may want to play with MAX_SOFTIRQ_RESTART value, which is now the
> number of calls allowed for a vector in a jiffy frame before it gets
> queued to the workqueue. I set it to the arbitrary value of 20 which is
> likely too low.
>
> Also I'm not sure about the last patch. For example in the usecase of
> Dmitry Safonov it may be better not to apply it. I guess only testing
> and reviews can tell.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> softirq/thread
>
> HEAD: 5a4c02b25bdcd853e3874d5319492ea6097f6e70
>
> Thanks,
> Frederic
> ---
>
> Frederic Weisbecker (5):
> softirq: Account time and iteration stats per vector
> softirq: Per vector deferment to workqueue
> softirq: Defer to workqueue when rescheduling is needed
> softirq: Replace ksoftirqd with workqueues entirely
> softirq: Reset vector call counter before workqueue completion
>
>
> Documentation/RCU/stallwarn.txt | 4 +-
> include/linux/interrupt.h | 7 +-
> kernel/sched/cputime.c | 12 +--
> kernel/sched/sched.h | 4 +-
> kernel/softirq.c | 232 +++++++++++++++++++++++++---------------
> net/ipv4/tcp_output.c | 5 +-
> 6 files changed, 161 insertions(+), 103 deletions(-)

Hi Frederic,

As reported on a separate thread:
http://lkml.iu.edu/hypermail/linux/kernel/1801.1/00110.html

The current approach taken since Kernel 4.9 by this patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd13c21b207e80ddb1144c576500098f2d5f882

Broke applications that record a digital TV channel.

The bug is easily reproductible on RPi3 with LibreELEC and tvheadend (with
both RPi downstram Kernel and with upstream Kernel 4.15-rc7).

Your patchset seems to be better addressing the softirq needs, by only
deferring processing when really needed, instead of always doing it.

I'm now testing if it fixes the issues with the media subsystem.

All tests below were done on a Raspberry Pi3 with a SanDisk Extreme U3 microSD
card with 32GB and a DVBSky S960C DVB-S2 tuner with an external power supply,
connected to a TCP/IP network via Ethernet (with uses USB on RPi). It also
have a serial cable connected to it.

On both systems, I'm running Kernel 4.15-rc7 + your
patches from this branch:
https://git.linuxtv.org/mchehab/experimental.git/log/?h=softirq_fixup

TEST 1: Raspbian with v4l-utils
===============================

I booted RPi3 on a raspbian partition and installed v4l-utils from its
git tree.

I added support at v4l-utils[1] to parse MPEG-TS continuity sequence number
on monitor mode.

[1] https://git.linuxtv.org/v4l-utils.git/

Before testing on RPi3, I double-checked the new discontinuity detector
several times on an i7core machine, to be sure that it won't be
producing false alarms, while it would be detecting and reporting
discontinuities when they happens.

On my tests, it is recording MPEG-TS data at ~60Mbits/s.

On this test, it seems that your patchset addresses the issue.

This is the results with your patchset and CONFIG_HZ=100:

$ rm out.ts; dvbv5-zap -l universal -c ~/vivo-channels.conf NBR -m -X 300 -t 300 -o out.ts 2>errors

62.67s: Starting capture
206.82s: pid 2064, expecting 1 received 6
362.70s: Stopping capture

PID FREQ SPEED TOTAL
18 1439.01 p/s 2113.5 Kbps 79260 KB
1901 933.19 p/s 1370.6 Kbps 51400 KB
1911 1250.57 p/s 1836.8 Kbps 68881 KB
1921 1280.59 p/s 1880.9 Kbps 70534 KB
1931 1382.41 p/s 2030.4 Kbps 76143 KB
1941 837.57 p/s 1230.2 Kbps 46133 KB
1951 531.91 p/s 781.2 Kbps 29297 KB
1961 531.91 p/s 781.2 Kbps 29297 KB
1971 866.72 p/s 1273.0 Kbps 47738 KB
1991 1187.88 p/s 1744.7 Kbps 65428 KB
2001 784.59 p/s 1152.4 Kbps 43214 KB
2011 770.16 p/s 1131.2 Kbps 42420 KB
2031 1925.98 p/s 2828.8 Kbps 106082 KB
2041 851.09 p/s 1250.0 Kbps 46877 KB
2051 812.99 p/s 1194.1 Kbps 44779 KB
2061 847.85 p/s 1245.3 Kbps 46699 KB
2071 1416.26 p/s 2080.1 Kbps 78007 KB
2081 1411.99 p/s 2073.9 Kbps 77771 KB
2091 531.91 p/s 781.2 Kbps 29297 KB
2101 531.91 p/s 781.2 Kbps 29297 KB
2111 1287.53 p/s 1891.1 Kbps 70917 KB
2131 845.45 p/s 1241.8 Kbps 46567 KB
2141 870.95 p/s 1279.2 Kbps 47971 KB
2151 2451.17 p/s 3600.2 Kbps 135009 KB
2161 854.14 p/s 1254.5 Kbps 47045 KB
2171 1211.97 p/s 1780.1 Kbps 66754 KB
2191 7313.75 p/s 10742.1 Kbps 402837 KB
8191 751.47 p/s 1103.7 Kbps 41390 KB
OTHER 3793.81 p/s 5572.2 Kbps 208961 KB 1 continuity errors
TOT 39506.70 p/s 58025.5 Kbps 2176006 KB

Lock (0x1f) Signal= -66.52dBm C/N= 14.31dB postBER= 0

Having just a single continuity error on 300 seconds seems acceptable
(and it could be unrelated to Kernel handling).

TEST 2
======

I booted a partition with LibreELEC 8.2.2 and tvheadend backend.

I'm recording one MPEG-TS service/"channel" composed of one audio and
one video stream, while playing the same video twice via network,
using VLC.

The total traffic collected by tvheadend was about 4 Mbits/s
(audio+video+EPG tables). It is part of a 58 mbits/s MPEG Transport
stream, with 23 TV service/"channels" on it.

On LibreELEC, I'm now seeing those logs, just after boot:

[ 9.262681] usb 1-1.4: DVB: adapter 0 frontend 0 frequency 0 out of range (950000..2150000)
[ 9.330306] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1
[ 13.282765] NOHZ: local_softirq_pending 08
[ 13.331928] NOHZ: local_softirq_pending 08
[ 13.480830] NOHZ: local_softirq_pending 08
[ 13.531364] NOHZ: local_softirq_pending 40
[ 13.820693] NOHZ: local_softirq_pending 08
[ 13.868430] NOHZ: local_softirq_pending 08
[ 14.088503] NOHZ: local_softirq_pending 08
[ 16.137247] NOHZ: local_softirq_pending 08

I ran libreELEC for about one hour there, and got those errors:

Jan 17 15:42:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 3)
Jan 17 15:44:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 5)
Jan 17 15:44:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 1)
Jan 17 15:45:11 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 6)
Jan 17 15:45:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 2)
Jan 17 15:45:25 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 8)
Jan 17 15:45:59 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 10)
Jan 17 15:45:59 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 5)
Jan 17 15:47:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 11)
Jan 17 15:47:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 6)
Jan 17 15:49:56 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 12)
Jan 17 15:50:07 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 13)
Jan 17 15:50:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 14)
Jan 17 15:50:35 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 7)
Jan 17 15:50:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 16)
Jan 17 15:50:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 8)
Jan 17 15:51:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 17)
Jan 17 15:54:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 18)
Jan 17 15:54:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 9)
Jan 17 15:58:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 21)
Jan 17 15:58:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 10)
Jan 17 15:59:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 22)
Jan 17 16:01:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 23)
Jan 17 16:01:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 11)
Jan 17 16:02:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 24)
Jan 17 16:02:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 12)
Jan 17 16:02:23 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 25)
Jan 17 16:03:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 26)
Jan 17 16:03:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 28)
Jan 17 16:04:24 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 29)
Jan 17 16:04:24 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 13)
Jan 17 16:07:42 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 30)
Jan 17 16:08:52 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 31)
Jan 17 16:09:20 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 32)
Jan 17 16:09:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 14)
Jan 17 16:10:30 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 34)
Jan 17 16:11:02 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 35)
Jan 17 16:11:02 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 15)
Jan 17 16:13:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 37)
Jan 17 16:14:01 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 38)
Jan 17 16:14:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 39)
Jan 17 16:18:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 40)
Jan 17 16:18:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 16)
Jan 17 16:19:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 41)
Jan 17 16:19:43 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 42)
Jan 17 16:19:43 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 17)
Jan 17 16:20:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 43)
Jan 17 16:20:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 18)
Jan 17 16:20:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 19)
Jan 17 16:21:41 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 44)
Jan 17 16:22:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 45)
Jan 17 16:22:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 20)
Jan 17 16:22:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 46)
Jan 17 16:25:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 47)
Jan 17 16:25:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 21)
Jan 17 16:25:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 48)
Jan 17 16:26:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 49)
Jan 17 16:26:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 22)
Jan 17 16:26:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 50)
Jan 17 16:26:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 23)
Jan 17 16:27:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 51)
Jan 17 16:28:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 52)
Jan 17 16:28:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 53)
Jan 17 16:28:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 24)
Jan 17 16:28:37 rpi3 kernel: [ 2918.072789] alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: [ 2918.075609] alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: [ 2918.078281] alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: [ 2918.124162] alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
Jan 17 16:28:45 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 55)
Jan 17 16:29:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 56)
Jan 17 16:29:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 25)
Jan 17 16:30:15 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 57)
Jan 17 16:30:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 58)
Jan 17 16:30:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 26)
Jan 17 16:30:54 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 59)
Jan 17 16:31:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 61)
Jan 17 16:31:25 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 27)
Jan 17 16:32:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 63)
Jan 17 16:32:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 28)
Jan 17 16:35:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 64)
Jan 17 16:37:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 65)
Jan 17 16:37:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 29)
Jan 17 16:37:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 67)
Jan 17 16:37:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 30)
Jan 17 16:37:49 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 68)
Jan 17 16:38:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 69)
Jan 17 16:38:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 70)
Jan 17 16:39:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 71)
Jan 17 16:39:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 31)
Jan 17 16:39:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 72)
Jan 17 16:39:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 32)
Jan 17 16:40:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 73)
Jan 17 16:40:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 33)
Jan 17 16:40:48 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 77)
Jan 17 16:40:48 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 35)
Jan 17 16:41:28 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 78)
Jan 17 16:41:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 79)
Jan 17 16:41:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 36)
Jan 17 16:42:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 80)
Jan 17 16:42:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 81)
Jan 17 16:42:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 37)
Jan 17 16:42:47 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 83)
Jan 17 16:42:47 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 38)
Jan 17 16:43:26 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 84)
Jan 17 16:44:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 85)
Jan 17 16:44:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 39)
Jan 17 16:45:10 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 86)
Jan 17 16:45:10 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 40)
Jan 17 16:46:45 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 88)
Jan 17 16:47:32 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 89)
Jan 17 16:47:32 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 41)
Jan 17 16:48:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 90)
Jan 17 16:48:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 42)
Jan 17 16:48:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 92)
Jan 17 16:49:23 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 93)
Jan 17 16:50:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 94)
Jan 17 16:50:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 43)

>From this test, it is clear that tvheadend is losing data from the TV
capture USB stick. On the tests I ran before, either reverting changeset
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd13c21b207e80ddb1144c576500098f2d5f882
or applying this fixup:
https://git.linuxtv.org/mchehab/experimental.git/commit/?h=softirq_fixup&id=7996c39af87d329f64e6b1b2af120d6ce11ede29

it got better results.

I intend to do further tests on it. Do you have some procedure to better
test it?

Thanks,
Mauro

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