Re: Boot hangs up with Alderlake's intel GbE NIC

From: Tomoaki AOKI <junchoon@dec.sakura.ne.jp>
Subject: Re: Boot hangs up with Alderlake's intel GbE NIC
Date: Tue, 24 May 2022 00:31:06 +0900

> Possibly not related (as it was P- E- core related complaint),
> if vm.pmap.pcid_enabled tunable is non-zero, does it change anything if
> you set it to 0 in /boot/loader.conf to disable pcid?
> 
> In February, discussion about AlderLake CPU were in -current ML,
> starting from [1] and disabling pcid was proposed by kib@ at [2].
> 
> Looking sysctl descrintion, I "feel" this can affect P- core only
> AlderLake, too.
> 
> % sysctl -d vm.pmap.pcid_enabled
> vm.pmap.pcid_enabled: Is TLB Context ID enabled ?
> 
> For example, it was 1 on Intel(R) Core(TM) i7-8750H CPU (Coffee Lake)
> and on board Intel(R) I219-V CNP(7) is working as em0.
> FreeBSD 13.1-STABLE #460 stable/13-n250911-b92a06875045-dirty, amd64.
> 
> So if I didn't miss any AlderLake-related commit, this would be 1
> on AlderLake, too.
> 
> [1]
> https://lists.freebsd.org/archives/freebsd-current/2022-February/001550.html
> 
> [2]
> https://lists.freebsd.org/archives/freebsd-current/2022-February/001589.html
> 
> 
> -- 
> Tomoaki AOKI    <junchoon@dec.sakura.ne.jp>
> 

On OK prompt I typed 'set vm.pmap.pcid_enabled=0' and then 'boot'. But
boot still hangs up with just same way.

---
Yasuhiro Kimura