[lkml]   [2000]   [Dec]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: test13-pre5
On Sun, Dec 31, 2000 at 09:27:23AM -0800, Linus Torvalds wrote:
> On Sun, 31 Dec 2000, Andi Kleen wrote:
> >
> > Sounds good. It could also be controlled by a CONFIG_SPACE_EFFICIENT for
> > embedded systems, where you could trade a bit of CPU for less memory overhead
> > even on systems where u8 is slow and atomicity doesn't come into play
> > because it's UP anyways.
> UP has nothing to do with it.
> The alpha systems I remember this problem on were all SMP.

I just checked all architecture manuals I could lay my hands on
(sparcv9, ppc32, mips r4400, parisc 1.1, alpha, sh is somewhere in
storage but as I remember it has it too)
and they all seem to have at least store byte and mostly store
half words instructions.

> Imagine an architecture where you need to do a
> load_32()
> mask-and-insert-byte
> store_32()

iirc the Alpha guys found out that they couldn't drive half of the
available devices without byte store, and since then nobody has
repeated that mistake @)

> I don't think it's a good diea.

I don't see it. Just define x8 to u32 on old alpha and let most other architectures
be happy.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:52    [W:0.069 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site