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PCI phased out? (Announce)

posted by marcov, 18.02.2011, 14:56

> > AES is a special case because it requires a fairly hefty 64-bit integer
> > calculation. IIRC SSE has no 64-bit integer. Only the 64-bit ALU has.
> (well
> > and the FPU has comp, bu not logic operations)
>
> Maybe, but in real use it will be limited by memory and IO speed. And
> current 32bit systems have already 64bit data bus.

Memory bus (L2/L3 to memory) or data bus (CPU to L1)?

The memory bus afaik has been 128-bit since NForce2 (when Dimms are installed in pairs)?

> So you will not get +100% but less. I cannot guess, did you make some benchmark?

See the DrDobbs article (may 2005 iirc). Since you have to do several 64-bit operations per loaded byte that split out into more than two 32-bit operands each, and access is in order, memory bus is not the issue. Sandy Bridge even adds hardware AES instructions to further improve performance.

It's a freak example, I know, but encryption and compression are slowly creeping in everywhere.

I btw also looked up the SSE2 vs SSE3 bit. Everything has SSE3 except first generation Athlon64 (754 socket). Even the 64-bit Pentium-D's do.

Still afaik most 64-bit compilers and ABIs still adhere strictly to SSE2 aligning requirements. Which shows again that the rough breaks now and then are healthy (at least IMHO)

> They would probably ask you what you did for idea linux on desktop to be
> more real and when you'll answer that nothing they will be wondering why do
> you mentoring them...
Well, I work on Lazarus of course. Moreover, that reasoning is flawed, _I_ didn't declare or echo the "year of Linux on the desktop" sentiment, so I don't have to defend it.

> I was talking with friend (coreboot coder) and he didn't know anything
> about intel core issue. They are more targeting on AMD because AMD gives
> them _complette_ specs (intel requires NDA for some low level things). Even
> he say that AMD has about 5 people who are coding for coreboot and they
> commited on SVN about 160000 lines of code. So there must be some intention
> of AMD. I quess they will replace BIOS with coreboot on future mobos. On
> other hand intel doesn't like coreboot and strictly pushes EFI. So it seems
> that DOS future depends on AMD and coreboot + seabios...
Interesting. Still that can change at any moment, but it at least means that current chipsets are still somewhat supported, even if only on the AMD side. (but that is enough)

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