[K12OSN] SL 6.1 NFS client for FC 14, performance issues?

[Burke Almquist]

On Aug 28, 2011, at 11:39 PM, Roland Roberts wrote:
> 
> Well, I'm ready to throw in the towel. I'm not sure what the pattern of usage is that causes it, but...
> 
> I created a 4GB file from /dev/urandom on the NFS server. Then I mount the directory on the client can do a "time cat /mnt/junk.dat > /dev/null" on the client. Then I unmount the directory from both the client and server, remount on the server and repeat on another client.
> 
> If I do the "cat..." test directly on the NFS server, which is a Fedora 14 32-bit machine, it takes 54 seconds. If I do it on a Fedora 14 64-bit client, it takes 70 seconds. If I do it on the SL 6.1 64-bit client, it takes 150 seconds. Multiple tries give results within a few seconds of those each time.
> 
> NFS options are set the same:
> 
> [root at copernicus ~]# mount -v archos:/data/video /mnt
> mount: no type was given - I'll assume nfs because of the colon
> mount.nfs: trying text-based options 'nfsvers=4,proto=tcp,noacl,ac,bg,nocto,lock,rsize=32768,wsize=32768,bsize=32768,mountproto=tcp,addr=192.168.3.3,clientaddr=192.168.3.36'
> archos:/data/video on /mnt type nfs (rw,nfsvers=4,proto=tcp,noacl,ac,bg,nocto,lock,rsize=32768,wsize=32768,bsize=32768,mountproto=tcp)
> 
> The hardware between the two clients is not identical, but the LAN chipset is Realtek 8168B in all three cases but...the "bad" client has a rev 02 chip and the other two have a rev 01 chip. No idea if that matters, although I have found comments about the 8168B online that I'm not sure how to take. I do know that I can't enable a 4k MTU on these or NFS stalls *very* badly. As in I log in but hang trying to run my .bashrc.
> 
> I'm about ready to take the SL 6.1 motherboard and trash it. It's an MSI board, the only one I've ever had and I had some problems with it being very picky about what memory was in it, so I'm starting to wonder....
> 
> roland
> 
> 
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SL 6 is mostly based on Fedora 12 and 13. That may be impacting this.
Have you tried using a smaller value such as 8192 for your rsize, wsize, and bsize?