Hi Jonathan
> On Sep 28, 2023, at 13:44, Jonathan Morton via Cake
> <cake@lists.bufferbloat.net> wrote:
>
>> On 19 Sep, 2023, at 1:07 am, Jonathan Morton <chromati...@gmail.com> wrote:
>>
>>> Raspberry Pi 4's just aren't very good at networking because of their I/O
>>> architecture on the board, just as they are slow at USB in general. That's
>>> why the CM4 is interesting. It's interesting that the PiHole has gotten so
>>> popular - it would run better on an Pi with a better network architecture.
>>
>> On the contrary, the Pi 4 has an excellent I/O architecture compared to most
>> of its peers, and especially compared to the previous Pis. The built-in NIC
>> is internal to the SoC and *NOT* attached via USB any more, so it can
>> genuinely support gigabit speeds. The USB interface is also fast enough to
>> support a second GigE NIC, though the latency wouldn't be as good as one
>> attached over PCIe. That's with a standard, off-the-shelf Pi 4B.
>
> Timely breaking news: the Raspberry Pi 5 has just been announced.
>
> The important new feature here (for us) is that it exposes a PCIe bus lane on
> the standard model, so you don't have to mess around with the Compute Module
> just to get access to that. The built-in Ethernet port is now implemented in
> a PCIe-attached "southbridge" chip, and the WiFi performance has been
> improved by accelerating the interface by which the radio is attached.
[SM] More things on the plus side:
4 A76 cores up to 2.4 GHz (versus 4 A72 cores up to 1.8 Ghz)
4 x 512 KB L2 cache plus shared 2 MB L3 cache (versus 1 MB shared L2)
LPDDR4X-4266 memory (versus LPDDR4-2400)
This promises even better performance for loads like cake than the already
pretty nifty pi4B
>
> On the downside, the price has gone up.
[SM] As well as the power consumption...
>
> - Jonathan Morton
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