[Arm-netbook] EOMA server standard

[Baybal Ni]

I doubt that there is any use for 10 Gb phy on arm system yet.
Although, you can already get cheap LP gigabit phys. I was imagining
that EOMA servers will work in mode of a hadoop system, a distributed
database of some kind or highly-distributed computing.

The killer feature here is not speed, but efficient interconnect. It
will be good if we can also get efficient on-backplace switch chip and
be able to organize efficient clustering.

My idea for current generation module is that it will work in a
following hierarchy.

module<on-backplane switch<normal high bandwidth switch.

This way, we don't yet need 1Gbit parts on the module.

On 23 October 2012 10:09, luke.leighton <luke.leighton at gmail.com> wrote:
> ok, right.  i've been talking to some companies and the need for a
> standard which covers data centres - e.g. has 10Gigabit Ethernet - has
> come up.
>
> it turns out that 10GBase-T is 500mhz and 16-way PAM over each of the
> 2-twisted-pairs that go onto a standard RJ-45.  so, *fast*, but also
> staggeringly power-hungry.  this 10GBase-T PHY IC has one variant at
> 2.4 watts and another at 6 watts:
>    http://www.solarflare.com/Ethernet-Controllers-LOMs
>
> so the question i'm raising is: what would people see as being the
> most appropriate general-purpose and lowest-common-denominator
> "upgradeable" interfaces to have on an EOMA standard?  and, what case
> would be good to re-use?
>
> for the pin-outs i figured that at least one 10GBase-T interface (8
> pins plus 8 GND spacers) would be acceptable, as would SATA-3 (4 pins
> plus 4 GND spacers).  that's 24 pins already (!).  PCI-Express 4x is
> 64 pins.  that's up to 88 *already*.  adding in USB3, it's not
> unreasonable to imagine this would be a 100-pin standard.
>
> so this is going to need some really careful thought.
>
> l.
>
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