[LAD] MidiSport vs. UA25

[Ralf Mardorf]

Arnout Engelen wrote:
> On Sat, Sep 26, 2009 at 01:29:53PM +0200, Ralf Mardorf wrote:
>   
>> Arnout Engelen wrote:
>>     
>>> - increased the rtprio for the USB IRQ handler
>>>       
>> How can I do this? I only know how to make my Siwssonic USB MIDI device  
>> head of the USB devices by Rui's rtirq.
>>
>> Is there something I could change for rtirq, to get less jitter for the  
>> USB MIDI device?
>>     
>
> I haven't looked into rtirq yet (I really should)

Hi Arnout :)

or you simply change the USB ports ;).

> , but if I understand 
> correctly rtirq does automatically what I did manually: find out which IRQ 
> the device you're interested in is connected to, and give that IRQ a 
> higher rtprio.
>
> To see the current rtprio's of your IRQ's, do:
>
>   ps axHo user,lwp,pid,rtprio,ni,command | grep irq
>
> To increase the rtprio of some irq manually:
>
>   chrt -f -p <prio> <pid>
>   

Thank you :).

Ralf

>>> - decreased the 'latency_timer' value for my wireless network card and cardbus
>>>   slot
>>> - tried to increase 'latency_timer' for the USB controller, but it 
>>> remained at 0 - i guess it doesn't support this option
>>>       
>> *?*
>>     
>
> http://irc.esben-stien.name/mediawiki/index.php/Setting_Up_Real_Time_Operation_on_GNU/Linux_Systems#PCI
>
>
> Arnout
>