Does WRT3200ACM DSA still suffers from half duplex?

Installing and Using OpenWrt
1

I am still on 19.07.10 and it's been solid, no problems. I read in the forums that the new DSA only uses one CPU core and the speed is limited to half duplex 500 mbps, is it still the case?

2

Your hardware would have two CPU ports to communicate with its switch (one for WAN, one for LAN), DSA currently can only use one (the first) of those. There are continued attempts to drop this limitation, but neither of the different approaches has really gained traction so far.

Technically speaking this isn't half duplex, but it may appear as such.

t;ldr: yes'ish - and I wouldn't expect that to change anytime 'soon' and the other issues of your hardware (the very 'special' WLAN chipset and openwrt-19.07 being EOL for a long time already) would worry me a lot more.

3

If the speed it limited to 500mbps then I might stick with 19 since it is very reliable and stable until the problem is solved.

4

It's not limited to 500 MBit/s, but the aggregate speed for WAN and LAN is limited to 1 GBit/s (1 GBit/s up, 1 GBit/s down, concurrently - vs 1(WAN)+1(LAN) GBit/s up + 1(WAN)+1(LAN) GBit/s down if its two CPU ports were supported). In practice it's rather rare that both upload and download are at full speed at the same time (although that may certainly happen), so the impact will be less (you'd have to test it, but I'd expect 600-800 MBit/s for 'normal' usage patterns).

Just test it (21.02.x or current master snapshots, 22.03 is broken for this hardware).

5

is 22.03.2 not good, I can see it in firmware selector.

6

No, either 21.02.x or current master/snapshots, https://openwrt.org/releases/22.03/notes-22.03.3#broken_mv88e6176_switch

7

Thanks for all the info, I think I will wait until 23 comes out.

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8

TurrisOS supports dual CPU DSA.

9

Which doesn't help that much for the Linksys WRT3200ACM, I guess…

(yes, I know, the patches can also be made to work on other targets, but they're not going upstream - nor into OpenWrt anytime soon (sadly, I might add)).

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10

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