On 05/29/2015 02:13 PM, Marcus Müller wrote:
Hi Richard,
320kS is not the minimal rate; if I'm not mistaken it's 100MHz/512.
Ds are relatively serious, and I've rarely seen them: The typical
"your system is too slow" results in "O"verflows; typically, you see
"D" if UHD starts wondering where the sample packet n disappeared to,
after receiving n-1 followed by n+1 (or so).
What's your ethernet hardware? (If on linux, "lspci | grep -i ether")
We've had some grief caused by USB3-to-ethernet-adapters which seemed
to take delight in confusing at least UHD, its users and a significant
part of its support team by randomly reordering packets on a direct
link. Also, there's a single Intel Gigabit Ethernet controller that
comes directly from hell, but it's becoming rarer in the wild every day.
Best regards,
Marcus
The notorious Intel NIC is the 82579LM. It drops packets, even at low
load. It's a FIFO control bug that they couldn't ever fix...
On 05/29/2015 06:07 PM, Richard Bell wrote:
Hi all,
I need some help determining the cause of D's being displayed from my
N210 device. I know it means GNU Radio is not consuming the samples
from my laptops Ethernet socket buffer fast enough, causing the USRP
to overflow it.
What I would like to do now, is learn how to monitor performance such
that I can figure out which part of my receiver is the bottleneck, so
I can focus on optimizations there. I can't lower the sample rate
anymore, because I'm already at the minimum rate the USRP requires
(320k).
Would someone recommend a next course of action and tools I should
download to proceed?
Appreciated,
Rich
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