Re: TSTILE lockups - not dead yet

[John Klos <john%ziaspace.com@localhost>]

> I've seen this TSTILE problem. Never did get useful debug info. See:
> https://mail-index.netbsd.org/port-macppc/2013/07/08/msg001958.html

It's not easy when there are hundreds of processes in TSTILE and people 
are bugging me because they can't check their email.

> I did a divide and conquer for the "analog bug", and understand that the 
> fix is in post-6.1 code, but have not heard specifically that it's fixed 
> in 6.1. I don't have a "scratch" macppc machine to test 7.0.

I think what you were seeing with Analog is what I was seeing with FLOPS:

http://mail-index.netbsd.org/port-macppc/2014/12/31/msg002138.html

> Now that I look at what I think is the commit, it looks like a small 
> patch. (a bit keeping track of the FPU is getting lost)
>
> If the kernel uses the FPU, this could be causing just about anything. 
> I'm betting it does not.

I tried NetBSD 7 a year ago (well, end of 2014), and it still had FPU 
bugs. When I tried NetBSD 7 in October, it didn't. I never found any 
commits which I thought might've screwed up FP save/restore. Which commit 
do you think fixed the issue?

John