Re: 4.01 panic/lock issues?

[David Brownlee <abs%NetBSD.org@localhost>]

On Mon, 19 Jan 2009, Izumi Tsutsui wrote:

> abs%NetBSD.org@localhost wrote:
>
> >         Maybe we should default m68k ports to compiling with -m68020-60 ?
>
> gcc's default seems -m68020.
>
> -m68020-60 will disable 68881/68882 only instructions,
> so it might make 040/060 a bit faster but
> also might make 020/030 slower slightly?

        It probably will slow down 020/030 slightly, but it should speed
        up 040/060 by a march larger margin. I think it should be the
        default for NetBSD m68k userland. Where a kernel is known to
        be for a specific subset of 020/030 040/060 then it can set
        more specific target options...

> Anyway, using -m68040 on building packages is too bad..

        I believe that the performance penalty of -m68020 on 040 boxes
        is great enough that there is real benefit for using -m68040.
        Defaulting to -m68020-60 would reduce that need significantly...

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