[mythtv-users] mythTV, Kaffeine and Twinhan DVB-T

[Nicklas Bergfeldt]

Nick Crabtree wrote:

> To see whether buffering is the issue, you could try activating laptop 
> mode, which groups disk write activity into "chunks" that are spaced 
> at larger intervals than they normally would be. Although this is 
> intended as a power saving idea to let a laptop's hard drive spin 
> down, it would in this case check whether the 30second interval jumps 
> are due to disk cache flushes. emerge laptop-mode-tools to install it, 
> and run /usr/sbin/laptop_mode start to start it.


I tried that and it did not have any effect :-(


> Of course, if you are running other stuff and don't have the free RAM 
> for more than 30 seconds of TV then you will still get disk activity 
> and laptop mode won't help.  But on a quiet system (no web browser or 
> email client running, for example) then you should have plenty of 
> spare RAM for this.


That should not be any problem since this computer is solely used for 
mythTV...


> You might also want to try benchmarking using interbench 
> members.optusnet.com.au/ckolivas/ 
> <http://members.optusnet.com.au/ckolivas/>*interbench*/


Would this indicate that I need faster hardware, or is it enough for mythTV?

Sky /usr/src/interbench/interbench-0.30 > make
gcc -W -Wall -g -O2 -s -pipe   -c -o interbench.o interbench.c
interbench.c:1404:18: warning: unknown escape sequence '\]'
gcc -W -Wall -g -O2 -s -pipe   -c -o hackbench.o hackbench.c
gcc -lrt -lm  interbench.o hackbench.o   -o interbench
Sky /usr/src/interbench/interbench-0.30 > ./interbench
loops_per_ms unknown; benchmarking...
514666 loops_per_ms saved to file interbench.loops_per_ms
Creating file for read load...

Using 514666 loops per ms, running every load for 30 seconds
Benchmarking kernel 2.6.15-gentoo-r1 at datestamp 200603151111

--- Benchmarking simulated cpu of Audio in the presence of simulated ---
Load    Latency +/- SD (ms)  Max Latency   % Desired CPU  % Deadlines Met
None      0.007 +/- 0.0153     0.218             100            100
Video     0.153 +/- 0.264      0.517             100            100
X          1.42 +/- 3.15          12             100            100
Burn      0.005 +/- 0.00633    0.016             100            100
Write     0.033 +/- 0.178       4.02             100            100
Read      0.024 +/- 0.025      0.071             100            100
Compile   0.053 +/- 0.364          8             100            100
Memload   0.128 +/- 0.705       8.01             100            100

--- Benchmarking simulated cpu of Video in the presence of simulated ---
Load    Latency +/- SD (ms)  Max Latency   % Desired CPU  % Deadlines Met
None      0.005 +/- 0.00574    0.023             100            100
X          4.15 +/- 9.3         33.3            99.1           83.4
Burn      0.006 +/- 0.0123     0.127             100            100
Write     0.028 +/- 0.186       5.75             100            100
Read      0.023 +/- 0.0281      0.22             100            100
Compile   0.036 +/- 0.491       20.7             100           99.9
Memload   0.091 +/- 0.87        24.7             100           99.8

--- Benchmarking simulated cpu of X in the presence of simulated ---
Load    Latency +/- SD (ms)  Max Latency   % Desired CPU  % Deadlines Met
None          0 +/- 0.00283    0.032             100            100
Video     0.003 +/- 0.0386     0.476             100            100
Burn          0 +/- 0.000872   0.012             100            100
Write     0.214 +/- 1.21          10            93.8             92
Read      0.036 +/- 0.42           6            99.3           98.7
Compile   0.202 +/- 1.04           8            96.2           93.3
Memload   0.149 +/- 0.983         10            92.1           90.7

--- Benchmarking simulated cpu of Gaming in the presence of simulated ---
Load    Latency +/- SD (ms)  Max Latency   % Desired CPU
None      0.001 +/- 0.0216     0.354             100
Video     0.008 +/- 0.157       2.94             100
X          12.9 +/- 31.3         208            88.6
Burn        195 +/- 269          367            33.9
Write      33.7 +/- 99.2         818            74.8
Read       6.27 +/- 6.71        10.3            94.1
Compile     326 +/- 395          570            23.5
Memload    15.7 +/- 33.7         191            86.4


Sky /usr/src/interbench/interbench-0.30 >


/Nicklas