Re: osmo-bts / osmo-pcu profiling results

On Mon, Dec 07, 2015 at 04:38:38PM +0100, Suraev wrote:

There's interestingly looking wrapper around epoll:

http://0pointer.net/blog/introducing-sd-event.html

I don't think we'd need a wrapper, a we don't need the timerfd and signalfd integration, child process state change events, unix process events, etc.

So the wrapper only adds a layer of abstraction and lots of features we don't need. The fundamental issue here is that both select() are quite epxensive (due to the large FD array copying/checking/zeroing), and the fact that obviously all data has to be always copied between kernel memory and userspace memory.

Not sure if it would cover dsp2userspace transfers though.

From the userspace point of view, is just a character device that you

open and read/write on, nothing fancy.