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Harald Welte laforge at osmocom.orgHi all,
it has been coming up in at least two contexts recently: Select is showing
up a lot in system-level profiles particularly on osmo-bts.
This is hardly surprising, as select() is not particularly known for
efficiency. It was used back in 2008 for the *BSC*, in a context where
we were talking about 1-10 BTS with each no more than 1-2 TRX. Now we
are using the same osmo_fd abstraction on the BTS, where the number of
messages per second is much higher, particularly in osmo-bts-trx with
its TRXD protocol, and particularly with higher number of TRX per BTS.
There is an older feature request to introduce epoll support in https://osmocom.org/issues/1579
but unfortunately nobody has been finding the resources and/or time to
implement it.
Meanwhile, 1.5 years ago, the Linux kernel received a new sub-system
called io_uring, which I would personally love to support. Here are some
pointers for those who are interested:
https://lwn.net/Articles/776703/
https://kernel.dk/io_uring.pdf
https://lwn.net/Kernel/Index/#io_uring
As unfortunately not everyone is using half-way recent kernels, we will
likely have to fall back to epoll or something like that.
Regards,
Harald
--
- Harald Welte <laforge at osmocom.org> http://laforge.gnumonks.org/
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