Hi,
On 11.6.2025 10.44, John Paul Adrian Glaubitz wrote:
As previously stated, NetBSD uses 4 bytes alignment and runs fine even on
68010-based systems. In fact, using a 4 bytes alignment will actually
improve performance as it's the natural alignment the hardware uses.
It will decrease performance if increased alignment means that something
that fit earlier into i/d-cache, does not fit any more.
(68030 has 256 bytes, 68040 has 4 KB, and 68060 has 8 KB, of both.)
To get some numbers on this...
if you could provide vmlinuz & System.map files for both (otherwise
identical) 2-byte & 4-byte alignment kernel builds, using kernel config
here:
https://github.com/hatari/hatari/blob/main/tools/linux/kernel.config
I could measure the perf difference for the whole kernel boot, and if
there are differences, profile what causes those differences.
- Eero
PS. I will be using Hatari for that, as it has semi-cycle-accurate
emulation for 38030, and good profiling facilities:
https://www.hatari-emu.org/doc/debugger.html#Profiling)
