releng/13 release/13.0.0 : odd/incorrect diff result over nfs (in a zfs file systems context)

[Rick Macklem]

Mark Millard wrote:
>On 2021-May-20, at 22:19, Rick Macklem <rmacklem at uoguelph.ca> wrote:
[stuff snipped]
>> ps: I do not think that r367492 could cause this, but it would be
>>     nice if you try a kernel with the r367492 patch reverted.
>>     It is currently in all of releng13, stable13 and main, although
>>     the patch to fix this is was just reviewed and may hit main soon.
>
>Do you want a debug kernel to be used? Do you have a preference
>for main vs. stable/13 vs. release/13.0.0 based? Is it okay to
>stick to the base version things are now based on --or do you
>want me to update to more recent? (That last only applies if
>main or stable/13 is to be put to use.)
Well, it sounds like you've isolated it to the genet interface.
Good sluething.
Unfortunately, NFS is only as good as the network fabric under it.
However, it's usually hangs or poor performance. Except maybe
for the readdir issue that Jason Bacon reported and resolved via
an upgrade, this is a first.
--> In the old days, I would have expected IP checksums to catch
       this, but I'm guessing the hardware/net driver are doing them
       these days?

W.r.t. reverting r367492...the patch to replace r367492 was just
committed to "main" by rscheff@ with a two week MFC, so it
should be in stable/13 soon. Not sure if an errata can be done
for it for releng13.0?

Thanks for isolating this, rick
ps: Co-incidentally, I've been thinking of buying an RBPi4 as a toy.
> . . . old history deleted . . .

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)