Thanks!
This is really valuable information. Also your new document with lots of useful
info and explanations what happens behind the scenes.
However, on my problematic Acer Aspire 8820T laptop with AR8151 NIC and atl1c
driver (instead of the Intel e100e driver below) , nothing of this has an
MANY NICs don't support larger frame sizes. Some of them require
that you set the larger MTU using ifconfig, and some will error-out if
you ask for an MTU too large. Others will accept the larger MTU request
and then silently ignore it.
On 12 Dec 2012 12:22, Rickard Radio
wrote:
Thanks!
Rickard:
By silently ignore, I mean that they'll apparently take
the higher MTU setting, but will actually drop any frames that exceed
the default (1500) MTU. Which is a particularly insidious failure mode
for these drivers...
On 12 Dec 2012 12:46, Rickard Radio wrote:
OK, thanks. My
OK, thanks. My problematic Acer with AR8151 NIC accepts MTU's up to about 6100.
Trying to set higher MTU it responds with an error. After setting to a large
value, such as 6000, I checked with ifconfig whether it was accepted. However,
as said, it has no effect on the failing UDP communication
OK, I see. However strange is that I can get UDP traffic to work up to about
925 Mbit/s without any dropped packets when testing with iperf and Ethernet
cable directly between the two Acer laptops. That with tuning UDP buffer size
to 600 kB and datagram packet size to 3000 bytes (using -l and
Hi,
I have also had a long and continuing fight with NICs and dropped
packets. Typically all Intel PCIExpress cards have been good, but
recently I have started having problems with Intel too. For example,
Intel 82579V consistently drops packets. I haven't seen any PCI bus
card work at full 25 MHz
Hi all,
Can anyone please try this on a laptop, preferably a Lenovo Thinkpad, with a
N210 and report what you get:
/uhd/examples/benchmark_rate --rx_rate 25e6
Thanks
Rickard
On Dec 7, 2012, at 3:32 PM, Rickard rickardra...@gmail.com wrote:
I wonder which GigE controllers (manufacturer
OK, I just tried this on a colleagues brand new Thinkpad T430s and it works
without any packet drops or other Ethernet problems on that laptop (at least
for a minute or so). It has the Intel 82579LM Ethernet chip so that chip
doesn't seem too bad after all (like the Artheros 8151 which I have
