[Cerowrt-devel] BQL, txqueue lengths and the internet of things

[Chuck Anderson]

On Thu, Jun 12, 2014 at 02:46:18PM -0700, Dave Taht wrote:
> > I'd bet the same could be done for
> > raspberry pi and perhaps my other toy the wandboard which has a gigE adapter
> 
> Well, measure first? Many of the low end devices can't achieve gigE
> in the first place, rendering the BQL method somewhat moot.
> 
> If you can provide a pointer to the right driver I can take a look.
> (dmesg | grep eth)

Mine's a Rasberry Pi model B running OpenELEC 4.0.4, an XBMC distro:

# uname -a
Linux OpenELEC 3.14.5 #1 PREEMPT Wed Jun 4 14:03:32 CEST 2014 armv6l GNU/Linux
# dmesg|grep eth
[    2.652186] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:70:1c:6e
[   18.188931] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[   18.190252] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   19.720667] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
[   19.756150] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

So it looks to be 100meg, because it is plugged into a gig capable
switch but it comes up at 100.  Confirmed with the hardware specs
here:

http://elinux.org/RPi_Hardware