[ale] NFS over wireless

[William Witt]

We don't have a cordless phone in the house, we do have a microwave, but 
I can reproduce the problem whether it's on or off.  I do also live 5 
miles from Miami International Airport and 2.5 miles from their remote 
radio site and VORTAC.  If I remember correctly 2.4 GHz is on the upper 
end of the freq range used for airport surveillance RADARs.  I'll spend 
some time this evening trying out different channels and see if one is 
better than the others.

Will

On 08/31/2009 11:57 AM, Ryan Marshall wrote:
> IMHO, sounds more like a network issue than a server issue.  The first
> thing I would do is look for source of interference.  Microwaves,
> cordless phones, neighbor's wifi, etc.  Then, I'd try changing the
> channel on the WAP.  WIthout a spectrum analyzer, it becomes a case of
> trial and error.
>
>     Message: 5
>     Date: Sun, 30 Aug 2009 22:00:30 -0400
>     From: William Witt <william at witt-family.net
>     <mailto:william at witt-family.net>>
>     Subject: [ale] NFS over wireless
>     To: ale at ale.org <mailto:ale at ale.org>
>     Message-ID: <4A9B2EBE.6000708 at witt-family.net
>     <mailto:4A9B2EBE.6000708 at witt-family.net>>
>     Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>     The setup:
>     I have an old laptop(+ a 500GB hd) acting as an NFS file server and uPnP
>     media server for my xbox360 connected via CAT5 and running
>     ubuntu-server.  I have two machines (mine and my wifes) plus the xbox
>     connected wirelessly.  My wife machine runs linuxMint and mine is
>     currently running Fedora 11.
>
>     The problem:
>     When either of us is copying large files (typically 1-2 GB movies) to
>     the file server, my wife's desktop and any nautilus windows will freeze
>     and sometimes crash.  I know it has to do with the NFS server because
>     when this happens "dmesg | tail" yeilds:
>
>     [ 2109.988015] nfs: server smeagol not responding, timed out
>     [ 2111.488016] nfs: server smeagol not responding, timed out
>     [ 2112.988020] nfs: server smeagol not responding, timed out
>     [ 2114.488016] nfs: server smeagol not responding, timed out
>     [ 2115.988014] nfs: server smeagol not responding, timed out
>     [ 2117.488015] nfs: server smeagol not responding, timed out
>     [ 2118.988020] nfs: server smeagol not responding, timed out
>     [ 2120.488016] nfs: server smeagol not responding, timed out
>     [ 2121.988023] nfs: server smeagol not responding, timed out
>     [ 2164.731019] nfs: server smeagol not responding, timed out
>
>     There is still enough available bandwidth on the wireless connection to
>     surf the web and do email.  And on her machine, everything but nautilus
>     works fine as long as there are no gnome file dialogs involved.  My
>     machine doesn't even hiccup, except for taking a long time to do an ls
>     on the nfs mount point.  I did see the same problem on my machine under
>     linuxMint and Ubuntu, but not under Suse or Fedora.
>
>     The Question:
>     My wife is opposed to me doing much to her machine that will impact her
>     work flow, so putting her on Suse or Fedora is out of the question.  I
>     don't own the house or I'd just run cat5 to her box.  Is there a better
>     way to tune NFS over wireless networks that will eliminate this problem
>     on ubuntu based boxen?  Am I baking up the wrong tree with NFS over
>     wireless in the first place?  If so, what should I be using?
>
>     On a side note, there seems to be something in our flooring that causes
>     A LOT of loos between the second and first floor.  I wonder if there is
>     some sort of anti static conductive coating on the laminate flooring
>     that the owners put down.
>
>     Will
>
>
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