FWIW, here is my data when I am connected to a HUB
(Netgear DS104) and only get around 3 Mbit/s speed:
# ifconfig -a
ixp0 Link encap:Ethernet HWaddr
inet addr:172.16.1.33 Bcast:172.16.255.255
UP BROADCAST RUNNING PROMISC MULTICAST
RX packets:492001 errors:4099 dropped:0
TX packets:745751 errors:0 dropped:0
RX bytes:64022786 (61.0 MiB) TX
bytes:403085975 (384.4 MiB)
ixp1 Link encap:Ethernet HWaddr
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0
TX packets:0 errors:0 dropped:0 overruns:0
RX bytes:0 (0.0 iB) TX bytes:0 (0.0 iB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0
TX packets:18 errors:0 dropped:0 overruns:0
RX bytes:2281 (2.2 kiB) TX bytes:2281 (2.2
--- paulbart1234 <paulbart@...
> I brought this up in a previous post, and subsequent
> messages seem
> to confirm it: there may be an issue with 'half
> duplex' ethernet on
> the NSLU2.
> If you connect something to a 'hub', it talks 'half
> duplex'. If you
> connect to a 'switch', it talks 'full duplex'.
> When you talk 'half duplex', the 'carrier detect'
> input on the
> IXP42x is used to determine whether/not someone else
> is 'talking' on
> the ethernet connection. This is used for collision
> On the project I'm currently working on (also
> IXP420-based), we had
> a problem with the PHY, where 'carrier detect'
> wasn't working
> correctly. We ended up getting tons of collision
> errors when
> talking 'half duplex' (for example: when
> plugged-into a 'hub' (vs.
> a 'switch')). It was a hardware/software design
> problem, which
> we've since fixed.
> I have a feeling that the NSLU2 may have a similar
> problem - maybe
> the "ETH_CRS[0/1]" signal(s) on the IXP420 aren't
> properly connected
> to the corresponding signal on the PHY chip. I
> don't know exactly
> how to confirm this - other than (perhaps) looking
> at "ifconfig -a"
> output, and seeing how many errors are seen on a
> 'hub' vs.
> a 'switch'.
> I could be wrong on this, but since I've noticed
> serious speed
> issues on a 'hub' (half duplex) (which went away
> when I went to
> a 'switch' (full duplex)), and others seem to have
> seen similar
> issues, I thought I'd point this out.
> - Paulb
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