Re: NFS writes being corrupted?

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

David Holland wrote:
>On Mon, Aug 03, 2015 at 02:51:37PM -0700, Jeff Rizzo wrote:
> > I need to look deeper, but a quick test writing lines of
> > ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
> > 
> > Shows that corruption starts when the file is exactly 65536 bytes long
> > (with an 8192 byte page size), with anything that size or longer getting
> > corrupted.  It seems to be randomly garbled - same size, same bytes, but
> > shuffled around.  When I was narrowing it down, I sometimes saw random
> > corruption inserted at larger file sizes - at one point I saw short strings
> > of NUL and the string "posix2_upe" (which would appear to be a symbol?)
> > inserted at seemingly-random spots.
>
>Does that size vary with the NFS block size?

Also is it using UDP or TCP ?

>The symptoms make me think of scrambled mbufs, if anything...

My guess is that the panics that wiz and I saw in the checksum code
on amd64 were also due to scrambled mbufs.

My cubietruck seems fine using awge(4), I have built a fair number of
packages over NFS recently.

Robert Swindells