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Red Hat Bugzilla – Attachment 869682 Details for
Bug 982660
audio-entropyd doesn't work with or without pulseaudio
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A new style configuration file that will work with the latest patch for 2.0.3.
audio-entropyd (text/plain), 3.20 KB, created by
stan
on 2014-03-02 19:53:24 UTC
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Description:
A new style configuration file that will work with the latest patch for 2.0.3.
Filename:
MIME Type:
Creator:
stan
Created:
2014-03-02 19:53:24 UTC
Size:
3.20 KB
patch
obsolete
># This is the configuration file for audio-entropyd's initscript. ># Each option must be entered on a line by itself as if it was ># being entered on the command line. The dash must be in the ># first column. ># Anything after a hash (#) mark and blank lines are ignored. ># Command line options override options in this file. ># And this has nothing to do with the options, but you should test the statistical quality of ># audio-entropyd on your setup with cat /dev/random | rngtest -c10000 or another practical number ># The test above takes about 6 hours on my system at 44100 frame rate with entropy-filter=0. ># RG Brown has a good explanation of the relationship of statistics with randomness in his man pages for dieharder. ># I get from 3 to 11 errors on runs. Statistically, this is expected, but really for good ># cryptographic numbers we don't actually want random numbers, because they include the tails that ># aren't crpytographically secure. Think patterns like 20 zeros or ones in a row, etc. So, you'll have to decide ># what seems reasonable. I think the best way to use this randomness is to make the /dev/urandom device ># more unpredictable. When audio-entropyd is running, I increase /proc/sys/kernel/random/write_wakeup_threshold ># to 3840 and I lower /proc/sys/kernel/random/urandom_min_reseed_secs to 5, ># providing more entropy and allowing /dev/urandom to take entropy from the pool more often. > ># Valid options are the following, also see with audio-entropyd -h or --help ># >#--device=plughw:0 #default, you can use hw:0, but your device has to support 32 bit signed output natively >#--device plughw:0 # original test, you can also leave a space in long options like this does, and short options do >--device=plughw:0 >#-d plughw:0 ># ># I haven't actually compared the filters to see if they extract the *same* entropy. It seems unlikely. >#--entropy-filter=10 # original test >#--entropy-filter=11 # original test, using dc offset to remove bias instead of previous value >--entropy-filter=0 # new test, default, about the same as 10, the original test >#--entropy-filter=1 # new test, second difference == 0, more restrictive >#--entropy-filter=2 # new test, second difference != 0, more restrictive >#-e 0 ># ># pausing and resuming is the default if the device supports it. This option causes audio-entropyd ># to open and close the device for each sample it captures, and throws away skip-size samples each time ># before capturing the sample. This is very inefficient, but ensures that the data gathered is always ># from regular operation. >#--always_close >#-a ># >#--do-not-fork # fork is default >#-n ># >#--sample-rate=22050 # default >--sample-rate=44100 >#-r 44100 ># >#--sample-size=11072 # default >#--sample-size=22144 >#-z 11072 ># >#--skip-size=11025 # default >--skip-size=5555 >#-s 11025 ># >#--internal-test # default is not to do internal testing. >#The kernel pool conditions the entropy data it is passed by audio-entropyd regardless. >#--internal-test >#-i ># >#--store-in-file="/tmp/audio_entropyd_output" # default is to not store in a file, but to fill the entropy pool >#-f "/tmp/audio_entropyd_output" ># >#--verbose # default is no messages, more repeats, more messages, max 3 has an effect >#--verbose >#--verbose >#-v >#-vv >#-vvv ># >#--help >#-h
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