Re: bytebench on 4KB/8KB pagesize kernels

[Ignatios Souvatzis <is%netbsd.org@localhost>]

On Wed, Dec 09, 2009 at 01:20:20AM +0900, Izumi Tsutsui wrote:
> After cleanup of pmap_bootstrap.c on all hp300 derived ports,
> I also made some changes in my local tree which make
> NetBSD/news68k kernel also work with 8KB/page settings.
> 
> I've tried pkgsrc/benchmark/bytebench on both
> 4KB/page and 8KB/page kernels on the same machine
> (NWS-1750D, 68030/25MHz with 16KB L2 cache), and
> I'm surprised because 8KB/page kernel is
> significantly faster than 4KB/page kernel.
> 
> Are these results really expected?

About the details I don't know - I'm too lazy to simulate the whole 
system with paper and pencil and count cycles - but in general, yes.

*Especially* on the 68030, which has the smallest TLB of all the 68k
family (only 22 entries).

Regards,
        -is