On Fri, 19 Aug 2016, Alexey Dokuchaev wrote:
On Fri, Aug 19, 2016 at 09:12:53PM +1000, Bruce Evans wrote:
I normally use my version of biosboot for boot2. I improved its caching
just a couple of years ago. It was using 9K buffer optimized for 1440K
floppies. Now it uses a 32K buffer. Booting a 5.5MB kernel takes a
fraction of a second.
That looks like change that everyone would benefit from. Consider posting
a patch or committing it yourself. ;-)
Oops, it is actually loading that takes a fraction of a second. Not
much different than with -current boot2 or old loader. -current boot2
also works for me, but I managed to squeeze more of the features that
I want into biosboot (everything except ufs2). Booting from the boot1
prompt takes 20-25 seconds here.
Of course I don't use modules, so not many seeks are needed.
Why not, they're convenient (apart from "kernel version mismatch" crap
that I keep hitting now and then)? AFAIR they were slow to load at some
point but that was (not so) recently fixed.
Same reason that I don't use shared libraries if possible - they are
larger, slower and more difficult to debug. For kernel development,
the version control problem is large. Modules are good for avoiding
rebooting when developing something in a single module, but I usually
work on either small changes that panic often or system wide-changes
that need recompiling everything. Both require rebooting a lot to
test, and I can rebuild a kernel and without modules and reboot it
almost faster than I can remember where the modules directories are.
Bruce
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