PVR-Add-Ons - cmyth - Mythtv plugin

[Karen Pollard]

(2nd Nov, 2013 01:23 AM)mk01 Wrote:  report back if you managed it.

Hi MK01

Yes, it works.

My cmdline.txt ended up being :-

sdhci-bcm2708.sync_after_dma=0 dwc_otg.lpm_enable=0 console=tty1 ip=dhcp root=/dev/nfs nfsroot=192.168.1.55:/piroot,tcp,vers=3 nfs-options=hard,intr,rw rootfstype=nfs smsc95xx.turbo_mode=Y elevator=cfq logo.nologo quiet noswap loglevel=0 mod_scsi.scan=sync partswap startevent=mountall splash nohdparm --startup-event mountall

My mount points end up looking like this (on the pi) after it's booted :-

rootfs 44G 20G 22G 49% /
192.168.1.55:/piroot 44G 20G 22G 49% /
devtmpfs 125M 4.0K 125M 1% /dev
none 25M 180K 25M 1% /run
/dev/mmcblk0p1 34M 19M 16M 56% /boot

My Setup (to better understand my views) :-
I run a 1Gb/s network, but of course, the pi is limited to 100Mb/s I think.
The export is from an ubuntu server and I chose to rsync the filesystem to the SSD disk on it to increase the speed. Also, important to note, is that I use pvr-add-ons (for mythtv (libcmyth)). The Pi is a Model B with Class 10 8GB SDCard.

First impressions :-
Bootup over NFS took 40 seconds to load xbmc and be useable, but then a further additional 4 MINUTES to load the EPG for mythtv.

Compare that to WITHOUT NFS, the times were :-

Boot into XBMC - 28 seconds (12 seconds faster)
Until EPG fully loaded - an additional 2mins 45 seconds (overall 2 minutes faster!!)

That said, once it is booted, it is presumably all in ram, and I couldn't tell the difference between NFS-booted or SDCard-booted, UNLESS I did something relating to the EPG for mythtv !!!

Presumably the EPG is a local database and it doesn't work efficiently over NFS (understandable).

But, the big plus is that SDCard corruption should NEVER be an issue. And with a bit of work, I can maintain ONE instance of xbian and not worry about keeping them all upto date individually.

Perhaps a way forward (thinking out loud here) is to run the root filesystem off NFS, and find where mythtv pvr-add-on stores its local database and use that off the SDCard ?

It's been an interesting exercise, but for now, I think I'll stick with SDCard versions and when time permits explore further

Thank you again for your EXCELLENT help MK01 !!

kp