A feature for -lowlatency kernel?

Артём Попов artfwo at gmail.com
Thu Apr 21 14:47:00 UTC 2011

2011/4/11 Alessio Igor Bogani <abogani at ubuntu.com>:
> Dear Ubuntu Studio Developers,
> 2011/3/25 Alessio Igor Bogani <abogani at ubuntu.com>:
> [...]
>>> So I could provide a -lowlatency kernel based on 39 kernel if enough
>>> testers will offer theirs help. Sincerely I would want avoid to waste
>>> time for make something that no one will use.
> [...]
> You can find the 39-lowlatency(*) kernel at
> https://launchpad.net/~abogani/+archive/snmp++/+packages
> I suggest to install it manually (so without add the PPA).
> Now it's your turn testers! :-)

I don't know how to run the proper tests/benchmarks, but I still get
xruns with my firewire card. I've got the firewire_ohci irq shared
between wifi, mmc and usb ports, so I added firewire_ohci to the rtirq
configuration file.

Qjackctl shows very high CPU load (~60%) when no clients are
connected. After adding firewire_ohci to RTIRQ_NON_THREADED list and
restarting rtirq the load dropped to something like 20%.

Xruns happen with a simple audio player (mocp), haven't tried anything
heavyweight yet.

Perhaps, some extra tweaking is required to enable this threaded irqs
feature? Any suggestions? Thanks!


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