On Wed, 2009-03-11 at 16:08 +0100, Bartłomiej Sięka wrote: > Hi, > > This is a follow-up on NFS problems on an MPC5200-based board reported > here a while back: > > http://www.nabble.com/-PATCH--Add-support-for-the-digsy-MTC-board.-to21750004.html#a21792612 > > To recap: while using NFS, especially while mounting the root > filesystem over NFS, the system is really slow and displays a bunch of > "nfs: server 192.168.1.1 not responding, still trying" messages. > Sometimes it is able to get to the login prompt, sometimes not. In > cases where the login is successful, the system is still extremely > sluggish (console hangs for tens of seconds and longer). > > git bisect narrows down the troublesome commit as:
Maybe you need to set CPU_FTR_NEED_COHERENT for the 5200 ? Cheers, Ben. > commit 4c456a67f501b8b15542c7c21c28812bf88f484b > Author: Gerhard Pircher <gerhard_pirc...@gmx.net> > Date: Fri Jan 23 06:51:28 2009 +0000 > > powerpc/mm: Fix handling of _PAGE_COHERENT in BAT setup code > > _PAGE_COHERENT is now always set in _PAGE_RAM resp. PAGE_KERNEL. > Thus it has to be masked out, if the BAT mapping should be non > cacheable or CPU_FTR_NEED_COHERENT is not set. > > This will work on normal SMP setups because we force-set > CPU_FTR_NEED_COHERENT as part of CPU_FTR_COMMON on SMP. > > Signed-off-by: Gerhard Pircher <gerhard_pirc...@gmx.net> > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> > > > We have tested recent mainline kernel (past 2.6.29-rc7) with the > 4c456a6... > commit reverted and NFS problems went away. > > Other people have also reported similar problems (original posters on > Cc): > http://www.nabble.com/-PATCH--Add-support-for-the-digsy-MTC-board.-tp21750004p21792825.html > http://www.nabble.com/-PATCH--Add-support-for-the-digsy-MTC-board.-tp21750004p21792612.html > > The commit in question does not look directly related to NFS/ > networking; moreover it is a fix for some other problem, so just > reverting it is not an option, it seems (?). So how do we go about > having NFS operational again? Any comments? > > Regards, > Bartlomiej Sieka _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev