On 2021-09-07 8:12 a.m., zhou wrote:
Hi Marcus,
Thanks for your comments on my other USRP questions. I have another
issue with N321 USRP.
Following the tuning tips in
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
<https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks> ,
I have set wmem_max, wmem_default, rmem_max, rmem_default to 33554432
in host (Ubuntu):
sudo sysctl -w net.core.wmem_max=33554432
sudo sysctl -w net.core.rmem_max=33554432
sudo sysctl -w net.core.wmem_default=33554432
sudo sysctl -w net.core.rmem_default=33554432
I have made the configuration permanent by adding these lines in
*/etc/sysctl.conf, *such that they won't get lost after host reboot.
I want to do the same in N321 but couldn't because there is no
sysctl.conf in it. I can still configure these parameters from
terminal, but it won't survive a reboot.
The Linux in N321 is tiny. How can I make the configuration
permanently in it?
Any comment from the community will be appreciated.
Thanks,
Hongwei
I don't have an N321 myself, but you will probably find that there's an
/etc/sysctl.conf.d directory, and you can create a sysctl.conf file there.
But unless you're using the N321 like it's an ordinary host, talking to
an *external* USRP, you shouldn't need to adjust these parameters.
When you're streaming samples into/out-of the N321, they don't go
through the CPU portion of the Zynq at all, so these parameters aren't
relevant.
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