Kernel 2.6, ML403, rootfs on nfs, gigabit ethernet link, nfs mount problems

[Mohammad Sadegh Sadri]

Hi all,

thanks for suggestions
I added rsize=1024,wsize=1024 to CMD LINE. INIT can now be executed from nfs, but I think that the problem still exists,
during the start up process ( from when the rootfs is mounted until user get a command prompt ) some times ML403 stops working completely, and generates "Segmentation Fault" and similar messages. some other times the system comes up with no problem. 

I had the same problem when mounting rootfs using nfs via 100mbits link , but for gigabit link the probability of reaching this unstable state is much higher.

any ideas?

thanks




----------------------------------------
> Subject: Re: Kernel 2.6, ML403, rootfs on nfs, gigabit ethernet link, nfs	mount problems
> From: bwarren at qstreams.com
> To: mamsadegh at hotmail.com
> CC: linuxppc-embedded at ozlabs.org
> Date: Tue, 29 May 2007 10:52:21 -0400
> 
> Hi Mohammad,
> 
> On Tue, 2007-05-29 at 14:41 +0000, Mohammad Sadegh Sadri wrote:
> > Hi all,
> > 
> > well I could bring up the grant's kernel on ml403 completely. the root file system was over nfs. 
> > 
> > when I use a 100mbits link for connection to ml403 , every thing is working suitably.
> > but when I use a 1000mbits link, I see that ml403 gets ip address from dhcp and mounts the root file system but can not go further , it stops with a message: "nfs server not responding ...." some thing like this.
> > 
> > when pinging to ml403 with 64 bytes packets, ping works fine for both of 100 and 1000mbits links
> > but when I try to ping the board with 4000 bytes packets I notice that ml403 on gigabit link can not answer to ping packets, however on 100mbit link every thing works just fine.
> > 
> > any ideas?
> 
> NFS is notorious for sending lots of big packets one right after
> another.  This can easily overwhelm an Ethernet receiver.  Until you're
> able to figure out why the 1000M link can't keep up, limit the NFS
> receive packet sizes by passing the following NFS option in your kernel
> command line:
> 
> rsize=1024
> 
> You can experiment with the value.  I believe the NFS default size is
> typically 8kB or greater.
> 
> regards,
> Ben
> 

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