Re: [PATCH] xprt sharing (was Re: xprt_bindresvport)

[Mike Waychison <Michael.Waychison@Sun.COM>]

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Lever, Charles wrote:
>>>but also notice this cuts the usable port range in half 
>>
>>(from ~800 to
>>
>>>~420).  we need some form of mitigation to ensure we aren't 
>>
>>limiting the
>>
>>>number of NFS mounts a client can have.
>>
>>This has been bugging me for a while.  The fact that we are limitting
>>ourselves to a single nfs mount per port.  From what I can 
>>tell, Solaris
>>shares the transports between nfs mounts from the same server 
>>and saves
>>themselves a lot of trouble with running out of port numbers 
>>in doing so.
>>
>>The attached patch does the same for Linux against 2.6.9.  We share
>>xprts from existing connections, effectively removing any limit on the
>>number of nfs mounts we have in the system.
>>
>>The only thing to worry about now is any talking to the portmapper or
>>mountd from userspace using tcp, which will put the reserved ports in
>>TIME_WAIT state.  This can limit the 'speed' at which we 
>>mount many mounts.
> 
> 
> we're looking at a similar solution.  we want to make sure we don't
> limit the scalability of everyone's mount point by making them all
> funnel through a single slot table.
> 

Can you post any work in progress for this?   The xprt patch I posted
was written a while ago, and I just realized this afternoon that it
doesn't seem to do the right thing for tcp sockets that are autoclosed.

If you have a similar patch that works, it would save me the trouble ;)


- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice

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