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Andrew Doran <ad%netbsd.org@localhost> writes:
> Someone mentioned bloat as a reason in favour of wrapping lots of small
> sections of code in ifdef COMPAT_XX *. There are lots of potential reasons
> to do that, but you're on crack if you think avoiding bloat is one of them.
> An i386 compat module I have here is around 20kB, so that's roughtly what
> the conditional part of the native compat code costs when in kernel - at
> least for the version of the module I am looking at. 20kB is around 0.2% of
> the size of the pre-modular i386 kernel.
If someone is trolling for bytes, I don't think they'll start out
with the GENERIC kernel. A more fair comparision would be to
measure the size of the compat code against the size of a minimal
kernel. From the NetBSD 5.0_BETA code base I built a
"NULL"-kernel, i.e. the smallest config I could get away with,
and it weighed in at 1095799 bytes. With some more effort, it
could possibly be made even smaller. Now, a 20kB non-avoidable
kernel size increase out of 1.1MB is is close to a 2% size
# NULL -- minimal kernel config file
config netbsd root on ? type ?
isa0 at mainbus?
attimer0 at isa?
npx0 at isa? port 0xf0 irq 13 # x86 math coprocessor
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