Re: Status of mount.nfs

[Chuck Lever <chuck.lever@oracle.com>]

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Trond Myklebust wrote:
> On Sat, 2007-07-28 at 08:51 -0400, Steve Dickson wrote:
>> Trond Myklebust wrote:
>>> On Fri, 2007-07-27 at 13:07 -0400, Steve Dickson wrote:
>>>
>>>> After how long of a wait? If all the timeouts are controllable then
>>>> I agrees, but if we have to wait undefined-able amount of time for
>>>> every RPC retransmit, then I think we should do a ping...
>>> You should be able to set the timeout either on a per-RPC call basis by
>>> using clnt_call(), or by changing the default timeout on the CLIENT
>>> object using clnt_control() (man 3 rpc).
>> True... but I was thinking of when clnt_cnt() call pmap_getport()
>> which does not take a timeout value...  In that case you are
>> stuck with a 60 sec hard coded timeout, regardless of the time out
>> you pass in...
> 
> In the version of mount.nfs from the linux-nfs.org git tree, we call our
> own private implementation of pmap_getport() instead of the one from
> glibc.

I was looking at this yesterday.  The stock timeout for TCP connects on 
Linux is 75 seconds.  The version of getport() used in the mount command 
might control the TCP connect timeout by using a non-blocking connect() 
with a select().  The select() then times out if the connection doesn't 
complete.

But I'm wondering if we really want to continue using TCP for GETPORT 
calls.  Solaris mount appears to use only UDP for GETPORT, for example.

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