[mythtv-users] No luck with RP3 mythtv inatall

[Tyler T]

Here's that 'top' sorted by memory consumption. As you can see, most
of my RAM (1.6GB) is being used for cache so for lightly loaded Myth
systems, 1GB is adequate.

top - 13:56:56 up 24 days, 19:39,  1 user,  load average: 0.23, 0.12, 0.09
Tasks: 113 total,   1 running, 112 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.6 us,  1.9 sy,  0.0 ni, 96.6 id,  0.5 wa,  0.0 hi,  0.4 si,  0.0 st
KiB Mem:   2063372 total,  2044636 used,    18736 free,    40240 buffers
KiB Swap:   131068 total,        0 used,   131068 free.  1647988 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 1282 mysql     20   0  335456  65588   3424 S   0.3  3.2 223:50.99 mysqld
 1126 root      20   0  493792  46928   5080 S   1.0  2.3   2183:28 mythbackend
 1355 root      20   0   21192  15496   1004 S   0.0  0.8   2:52.97 miniserv.pl
14796 root      20   0   36344  10400   7644 S   5.9  0.5   0:34.73 smbd
 1866 root      20   0  289952   6000   1908 S   1.3  0.3 544:38.94 mythlogser+
  176 root      20   0   11828   4916   4616 S   0.0  0.2   1:50.74 systemd-jo+
  522 root      20   0    7184   3520    444 S   0.0  0.2  15:13.98 haveged
14930 root      20   0    6080   3156   1248 S   0.0  0.2   0:00.21 bash
14838 root      20   0   10640   3004   2320 S   0.0  0.1   0:00.32 sshd
 1600 root      20   0   30836   2952   1280 S   0.0  0.1   3:15.08 smbd
    1 root      20   0    4528   2408   1280 S   0.0  0.1   1:07.73 systemd
 1607 root      20   0   30836   2248    576 S   0.0  0.1   0:18.53 smbd
 1498 root      20   0   19316   1980    788 S   0.0  0.1   1:16.82 nmbd
  565 root      20   0   31524   1756    812 S   0.0  0.1   0:22.97 rsyslogd
14840 root      20   0    3592   1352   1072 S   0.0  0.1   0:00.05 systemd
14841 root      20   0    5776   1264     48 S   0.0  0.1   0:00.00 (sd-pam)
  564 ntp       20   0    4812   1164    732 S   0.0  0.1   4:46.93 ntpd


Also, FYI the below benchmark suggests the RPi2 is capable of up to
30MBps (240Mbps) throughput which is pretty close the USB 2.0
theoretical maximum of 35MBps (280Mbps) as per Wikipedia.
(Unfortunately this doesn't report the CPU overhead required for all
that USB communication.) I wouldn't try to push things that far, but
it does make 15MBps (120Mbps) seem quite do-able.

http://www.mikronauts.com/raspberry-pi/raspberry-pi-2-usb-hard-drive-and-adapter-tests/
https://en.wikipedia.org/wiki/USB#USB_2.0