[mythtv-users] nfs pauses

[Yianni Vidalis]

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> Date: Thu, 12 Nov 2009 15:13:55 +0100
> From: belcampo at zonnet.nl
> To: mythtv-users at mythtv.org
> Subject: Re: [mythtv-users] nfs pauses
>
> Yianni Vidalis wrote:
>> First of all, thank you all for your input.
>>
>> Sorry it took me so long to post but I've been very busy. And please accept my apologies for the unnecessarily repeated posts, but either hotmail or the List had a problem while I was trying to post the first time.
>>
>> Anyway, what I tried so far with the nfs server (opensuse):
>>
>> - I downgraded my opensuse 11.1 kernel to 2.6.27.29-0.1-default (I kept the .rpm) but the problem is still there. It is the kernel I am still running.
>>
>> - I followed torbjorn.jansson at gmail 's suggestion about iptraf, but I had no success. Trying a similar approach, I tried pinging from the nfs server the frontend but no success, either. (by the way, my frontend is a debian Lenny system (2.6.26 kernel)).
>>
>> - Reading myth at robinhill 's post I changed the fstab entry to rw,sync,hard. This is the best behaviour so far, meaning that the first pause occured 5 minutes into the video. I guess it's due to the increased {w,r}size.
>>
>> - Trying mail at benlancaster's suggestion: Sorry, but using the defaults doesn't work for me. The pauses occur very often.
>>
>> - I even tried to decrease {w,r}size to 4096 and later to 2048 bytes. Still problem.
>>
>> So far I am using the rw,sync,hard mount option, because it is the one with the least pauses. I will install the latest kernel as before since it doesn't seem to affect anything, and I will probably wait for opensuse 11.2 to come out (it is on T-18 today) which has 2.6.31.5 kernel and other improvements. You see, I still think it's a nfs or kernel or network problem (can you imagine how I'll feel if I see a relevant commit in myth trunk? LOL)
>>
>> Thank's again for your response,
>>
>> Yianni.
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> 2.6.27 kernels are 'known' to have nfs related problems
> Default, if nothing is defined at server and client side, rsize and
> wsize should be 1048576
> If server side doesn't do this by default for whatever reason you can
> force it in one of your boot-scripts with:
>
> echo 1048576> /proc/fs/nfsd/max_block_size
>
>
> Your client will then negotiate what maximum is acceptable which also
> should be 1048576.
> Check with less /etc/proc/mounts
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Thank you, you are correct, 1048576 is the current value. I didn't have to force it, the pcs negotiated it. 
 
Apparently, opensuse 11.2 is out now and I will be very busy during the weekend (if I wait that long). If it's a kernel problem, this will solve it. If it isn't, well... 		 	   		  
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