From: Stefan Wuerthner <trash.wuerthner@gmx.de>
Subject: RE: Sporadic timeout problems during streaming to nfs server
Date: Wed, 14 Sep 2005 11:58:50 +0200
Message-ID: <63dd34aa4d.stefan@wuerthner.dyndns.org>
References: <044B81DE141D7443BCE91E8F44B3C1E288E43C@exsvl02.hq.netapp.com>
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In message <044B81DE141D7443BCE91E8F44B3C1E288E43C@exsvl02.hq.netapp.com> you wrote:

> don't use the "soft" option -- use "hard" instead.  "soft" with "udp" is
> a sure recipe for data corruption and the very symptoms you describe
> below. 
> 

I already tried "hard", but without success:

The serial log tells me:

[Fri Sep  9 11:50:20 2005]
nfs: server 192.168.24.50 not responding, still trying
[Fri Sep  9 12:58:53 2005]
PANIC: not enough space in ringbuffer, available 42887, needed 93225


E.g. the client cannot reach the server and therefore the client ringbuffer
overflows. This results in a total lockup of the client...


> > -----Original Message-----
> > From: Stefan Wuerthner [mailto:trash.wuerthner@gmx.de] 
> > Sent: Tuesday, September 13, 2005 8:02 PM
> > To: nfs@lists.sourceforge.net
> > Subject: [NFS] Sporadic timeout problems during streaming to 
> > nfs server
> > 
> > - I have the following setup:
> > 
> > DBox (DVB-C receiver, 10BaseT) connected to
> > 100MBit-Switch connected over 10m TP to
> > 100MBit-Switch connected over 5m TP to
> > Netwinder (Linux server, 100BaseT)
> > 
> > - Export options on the Netwinder (Kernel 2.4.19-rmk7-nw1):
> > 
> > dbox2(rw,insecure,all_squash)
> > 
> > - Mount options on the DBox (Kernel 2.4.31-dbox2) to stream 
> > the DVB-TS:
> > 
> > rw,soft,udp,nolock,rsize=8192,wsize=8192
> > 
> > - This results in:
> > 
> > 192.168.24.50:/home/wuerthne on /mnt/filme type nfs (rw,v3,rsize=8192,
> > wsize=8192,soft,udp,nolock,addr=192.168.24.50)
> > 
> > 
> > Unfortunately, I sometimes get a timeout error in the serial 
> > logfile of my
> > DBox:
> > 
> > [Tue Sep 13 19:15:49 2005]nfs: server 192.168.24.50 not 
> > responding, timed out
> > [Tue Sep 13 19:15:49 2005][stream2file]: error in write: 
> > Input/output error
> > [Tue Sep 13 19:15:51 2005][stream2file] pthreads exit code: 4294967293
> > [Tue Sep 13 19:15:56 2005][neutrino.cpp] executing 
> > /var/tuxbox/config/recording.start.
> > [Tue Sep 13 19:15:57 2005]Record channel_id: 44d00016dcd epg: 
> > 44d00016dcda60c, apids  mode 1
> > [Tue Sep 13 19:46:43 2005]nfs: server 192.168.24.50 not 
> > responding, timed out
> > [Tue Sep 13 19:46:43 2005][stream2file]: error in write: 
> > Input/output error
> > [Tue Sep 13 19:46:44 2005][stream2file] pthreads exit code: 4294967293
> > [Tue Sep 13 19:46:49 2005][neutrino.cpp] executing 
> > /var/tuxbox/config/recording.start.
> > 
> > E.g. the client recognizes a timeout and restarts the recording. This
> > results in two ore more fragments which is not desirable.
> > 
> > For some time now, I played with different NFS options, 
> > changed switches and
> > so on but to no avail. Sometimes I can stream 5GB without problems,
> > sometimes the timeout occurs after a short period of time.
> > 
> > 
> > Any ideas what I can change or how I can diagnose this 
> > problem further to
> > avoid the timeouts?
> > 
> > 
> > Stefan
> > 


-- 
-----------------------------------------------------------------------------
Stefan Wuerthner                             web  http://wuerthner.dyndns.org
-----------------------------------------------------------------------------


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