Changes between Version 33 and Version 34 of IrqPriorities

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Author:
nettings (IP: 80.139.178.182)
Timestamp:
10/20/10 05:20:22 (9 years ago)
Comment:

add note about jackd priority

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  • IrqPriorities

    v33 v34  
    145145}}} 
    146146 
    147 === 4. (optional) Find a good slot for your external USB disk === 
     147=== 4. Get the jackd priority Just Right(tm) === 
     148 
     149Now that all hardware-related priorities are settled, you can increase your jackd priority. Obviously, it does not make sense to raise it above the IRQ handlers we need for audio. But it makes a lot of sense to set it higher than the standard tasklet value, which is FF/50 on most systems. {{{60}}} will be a good value, because it leaves enough room to insert other stuff later, if necessary. But {{{51}}} will perform the same - remember these are relative numbers used for sorting a task queue, nothing more. 
     150 
     151Use jackd's -P parameter, or set the priority value in qjackctl accordingly. Afterwards, you can verify your settings: 
     152{{{ 
     153hoppetosse:~ # ps -eLo pid,cls,rtprio,pri,nice,cmd | grep -i "FF" 
     154}}} 
     155 
     156=== 5. (optional) Find a good slot for your external USB disk === 
    148157 
    149158Plug your USB drive into your machine. Then use the {{{lsusb}}} command to find out which bus it's sitting on. The number of the bus should correspond to the number of the "good" USB port as listed in {{{/proc/interrupts}}}. Swap USB ports until you've hit it. (But don't be frustrated if you don't - some mainboards provide "optional" USB ports that are not connected to any physical socket on the outside and can't be used easily.)