Re: Kernel config for Sun 3/50

[Trent McNair <tmcnair%gmail.com@localhost>]

I went all the way back to NetBSD 2 and was able to boot, just barely.
I can also boot SunOS 4.11 comfortably (no surprise).

When I try and boot 9.3, I don't successfully get through single-user
mode. I'm net-booting, and if I'm not mistaken, there is no remote
swap support in single-user mode, so I think I've hit a roadblock and
4M is just not sufficient to get the job done.







On Mon, Jan 30, 2023 at 11:35 AM David Brownlee <abs%absd.org@localhost> wrote:
>
> On Thu, 26 Jan 2023 at 01:32, Chris Hanson <cmhanson%eschatologist.net@localhost> wrote:
>>
>> On Jan 20, 2023, at 9:11 PM, Trent McNair <tmcnair%gmail.com@localhost> wrote:
>> >
>> > I commented out the kernel size check code and built a minimal kernel,
>> > it does boot and tries to go into single-user mode but only after a
>> > very long time . After that, things start crashing, complaining about
>> > swap space. I'm not sure at what point in the boot sequence the swap
>> > gets activated, but I don't see any indication on my NFS server that
>> > the swap file is mounted or accessed. I tried swapctl -A from the
>> > shell prompt but that crashed as well. I've attached a boot log below.
>>
>> One thing I've done when booting minimal-memory systems (such as an HP 9000-332 with 8MB) is put attaching a swap file at the very top of /etc/rc, because I was seeing the attempt to execute rc failing due to lack of memory. Normally swap is attached towards the middle or end of /etc/rc, from what I recall anyway.
>>
>
> That's a very good point
>
> % cd /etc/rc.d && rcorder * | head -20 | fmt
> wdogctl fsck_root modules resize_root root devpubd-early devpubd
> zfs ccd rndctl cgd lvm raidframe sysctl DISKS dkstrat swap1 fsck
> mountcritlocal clearcritlocal
>
> From a quick look at the rc startup order for NetBSD-10 the system runs a few things before swap1 gets called. swap2 comes much later (swap1 mounts swap devices, while swap2 mounts on files).
>
> There is possibly an argument for a "swap0", to come directly after fsck_root, which would attempt to mount available swap devices, and swap1 could be tweaked to ignore existing device mounts
>
> David