Re: RAID-6: help wanted

["H. Peter Anvin" <hpa@zytor.com>]

Jim Paris wrote:
>>That makes sense (and definitely explains why I didn't find the problem.)
>>
>>I tried it out, and it seems much better now.  It does, however, still 
>>seem to have a problem:
>>
>>+ e2fsck -nf /dev/md6
>>e2fsck 1.35 (28-Feb-2004)
>>Pass 1: Checking inodes, blocks, and sizes
>>Inode 7 has illegal block(s).  Clear? no
>>
>>Illegal block #-1 (33619968) in inode 7.  IGNORED.
>>Error while iterating over blocks in inode 7: Illegal indirect block found
>>e2fsck: aborted
> 
> 
> The patch (thanks, Neil!) seems to work fine for me with both the
> ReiserFS and ext2 test scripts, on an x86, both with and without
> waiting for resync.
> 

Right, see previous; it seems to be an unrelated ppc64 problem that 
happens even without RAID of any kind.  I'm building an i386 kernel with 
the patch now to try it out.

FWIW, I also hacked up Altivec support for ppc/ppc64; it took all of a 
whopping half-hour to make work, since gcc can generate Altivec code and 
it's actually quite good at it.  The resulting code runs at a whopping 
6.1 GB/s on a 2.5 GHz 970.

	-hpa