Re: [Discuss-gnuradio] Overflow error in benchmark receiver side "DDDD"

On Sat, Apr 16, 2016 at 10:27 PM, Marcus Müller <address@hidden> wrote:

Hm, those are usually good. What's the exact model ("lspci" will tell)? What's your OS?
On 16.04.2016 18:10, monika bansal wrote:
Hi Marcus

The network card is PCI Express Gigabit Ethernet Controller with 1Gbps capacity.

Thanks,

Monika
On Fri, Apr 15, 2016 at 6:38 PM, Marcus Müller <address@hidden> wrote:
No harm done :) So the point is that DDDD is still pretty bad, and usually shouldn't happen, unless your PC is *much* too slow, and usually would be preceeded by a couple of "O".
There's two cases where this doesn't happen:
* Too small network buffers
* strangely misbehaving network hardware.

So: what is your network card?

Best regards,
Marcus
On 15.04.2016 14:32, monika bansal wrote:
Yes my mistake :). Sorry for that. I just did not think of the python block at that time and then after i realized.

Regards,

Monika
On Fri, Apr 15, 2016 at 5:17 PM, Marcus Müller <address@hidden> wrote:
Monika,

no offense, but when you report a problem with software, it's pretty crucial you point out whether you've modified the software or not :)

Best regards,
Marcus
On 15.04.2016 06:28, monika bansal wrote:
Hii,

Thank you for your help.

That "DDDD" issue is not coming with original benchmark files.

I added one python block in between the chain in benchmark code. I think due to which it was not fast enough to process the incoming data resulting "DDDD" issue.

Regards,

Monika
On Tue, Apr 5, 2016 at 11:51 PM, <address@hidden> wrote:
What if you make the file "/dev/null" -- does this still happen?

On 2016-04-05 14:12, monika bansal wrote:
Hii,

I am running benchmark code and on the receiver side after receiving some number of packets(8000 so), it starts showing overflow errors ("DDDD") on terminal.
Following is the system configuration

python benchmark_rx.py -f 1100M --args "addr=10.32.38.163" --to-file=/home/ashokbandi/GNU/a_rx.txt --bandwidth=500000

Decreasing the bandwidth delays the error.

I tried changing buffer size by setting net.core.rmem_max and net.core.wmem_max to 33445532 but to no avail.

Following is the screen shot of terminal

DDok: True     pktno: 24116     n_rcvd: 9730     n_right: 9723
DDDDDDDDok: True     pktno: 24182     n_rcvd: 9731     n_right: 9724
DDDDDDDDDDDDDDok: True     pktno: 24319     n_rcvd: 9732     n_right: 9725
DDDDDDDDDDDDDDDDok: True     pktno: 24442     n_rcvd: 9733     n_right: 9726
DDDok: True     pktno: 24477     n_rcvd: 9734     n_right: 9727
DDDDDDDDDok: True     pktno: 24568     n_rcvd: 9735     n_right: 9728
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDok: False     pktno: 22729     n_rcvd: 9736     n_right: 9728

Thanks

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From:	monika bansal
Subject:	Re: [Discuss-gnuradio] Overflow error in benchmark receiver side "DDDD"
Date:	Mon, 18 Apr 2016 22:23:18 +0530