[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[ale] 3 days of 3+ hrs Comcast Outages!
Can?t speak for R-pi?s, but with USB3-to-GigE adapters, I?m seeing
920Mbps from two different chromebooks. The rest of the network is GigE
with PRO/1000 NICs. There are multiple $20-ish cheap switches involved,
but that part of the network is flat.
I did lots and lots of wifi work in a prior life. Would be happy to
share what I know at a Sunday meetup. Basically, I avoid wifi unless
absolutely necessary.
The wired r-pi-v2 is on the same GigE network. Never thought to do any
iperfs ... let me see how hard that is. Easy.
~$ iperf -c hadar
------------------------------------------------------------
Client connecting to hadar, TCP port 5001
TCP window size: 43.8 KByte (default)
------------------------------------------------------------
[ 3] local 172.22.22.28 port 43586 connected with 172.22.22.6 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 112 MBytes 94.2 Mbits/sec
and
$ sudo lshw -C network
*-network
description: Ethernet interface
physical id: 2
logical name: eth0
serial: b8:27:xx:xx:xx:xx
size: 100Mbit/s
capacity: 100Mbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt
100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=smsc95xx
driverversion=22-Aug-2005 duplex=full firmware=smsc95xx USB 2.0 Ethernet
ip=172.22.22.28 link=yes multicast=yes port=MII speed=100Mbit/s
which explains the sub-100Mbps. With USB2, the theoretical max is
400Mbps, but I?d be shocked if the chips allowed over 200Mbps. I have
an SSD via USB3 which could be tested ... but it is encrypted, uses LVM
and would be a hassle to install all that onto a R-pi (I suspect).
On 06/05/2016 01:33 PM, Chris Fowler wrote:
>
>
> How much can you push through that USB attached ethernet? That is my
> concern at a speed such as 250Mbps.
>
> I've been testing a few USB 3.0 Gib adapters. I'm seeing about 120Mbps
> via iperf. For my application on my device that is more than enough.
>