Re: [PATCH] Fix xprt_bindresvport range

[Olaf Kirch <okir@suse.de>]

> Are you referring to the problem of running out of free privileged
> ports?  Sure, but that is not the problem that Olaf's patch attempts to
> address.

Indeed. The patch fixes what I think is a genuine bug (i.e. sunrpc
grabbing ports from the 1-512 range). Of course I added the sysctls to allow
admins a little flexibility in environments where they do run out of
reserved ports, but I'm also aware that this is just a stop-gap measure.

> To address that problem, we certainly also want to add support for
> sharing of sockets to the same server, and there may be further sharing
> schemes that we can implement. For instance, UDP sockets don't have a
> connection protocol, so they can basically talk to anyone.

I think we need to have connection pools to avoid scalability problems.
I was planning to look into this, unless someone else is already working
on it.

> For TCP sockets, we should also consider playing with the TCP_LINGER2
> socket option (to enable us to re-use the port without having to wait
> through a 60 second timeout).

Adding that in mount(8) may help with some usage patterns. In the kernel
I wouldn't expect it to make too much of a difference.

Olaf
-- 
Olaf Kirch   |  --- o --- Nous sommes du soleil we love when we play
okir@suse.de |    / | \   sol.dhoop.naytheet.ah kin.ir.samse.qurax


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