From: =?iso-8859-1?Q?Peter_=C5strand?= <astrand@cendio.se>
Subject: timeo & retrans, smaller max timeout than 60 seconds?
Date: Wed, 29 Mar 2006 09:44:05 +0200 (CEST)
Message-ID: <Pine.LNX.4.64.0603290921500.2597@maggie.lkpg.cendio.se>
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Hi. We are using unfsd to provide "personal" mounts in a thin client=20
environment, based on NFSv3 over TCP over SSH. This works fairly good, bu=
t=20
we would like a little shorter timeout when the server doesn't respond=20
(such as when the user has disabled file sharing and thus stopped unfsd).=
=20
Currently, we are mounting with:

rw,noexec,nosuid,nodev,port=3DXXXX,mountport=3DXXXX,mountvers=3D3,nfsvers=
=3D3,nolock,fg,soft,intr,tcp,actimeo=3D2,addr=3D127.0.0.1

The important options wrt timeout here is:

fg,soft,intr,tcp

So, we are not using timeo or retrans at all. The result is timeouts=20
varying between 3 and 180 seconds. The worst case seems to be when doing =
a=20
"kill -STOP" on unfsd (thus, simply not respond, in contrast to respond=20
with EOF or similiar).

My questions are:

* How can we lower the timeouts? To me, it seems like the hardcoded
   maximum timeout of 60 seconds is a bit of a problem. How about
   introducing an option for changing this?

   If we start using, say, retrans=3D1, does this mean that applications =
can
   recieve EIO after as little as 1 second?


* Is it true that all the "-f" option to umount does is skip trying
   MOUNTPROC_UMNT?


* About "intr": The man page says "If an NFS file operation has a major
   timeout and it is hard mounted". Does "intr" affect soft mounts in any
   way, or is it better to remove it?


Regards,
--=20
Peter =C5strand		ThinLinc Chief Developer
Cendio			http://www.cendio.se
Teknikringen 3
583 30 Link=F6ping        Phone: +46-13-21 46 00
--789237761-1600035005-1143618245=:2597--


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