Editing nvram variables

[johnathonm]

Hi,

I was wondering about editing nvram variables. I know it's possible to do with entware and busybox. If we were going to make changes where would they be placed? Or is that not possible at this time?

Thanks,

J

 

[ColinTaylor]

NVRAM variables are stored in... NVRAM. You can manipulate them with the "nvram" command, that's nothing to do with entware or busybox.

 

[johnathonm]

Sorry, I meant the sysctl -a variables.

 

[ColinTaylor]

There is no sysctl command on the router, you will have to use /proc/sys instead.

 

[Johnathon]

I know I would use cat /sys/proc, but is there a list of these values that would correspond to what you'd get with sysctl. There is sysctl as part of busybox entware, btw.

 

[ColinTaylor]

I know I would use cat /sys/proc, but is there a list of these values that would correspond to what you'd get with sysctl.

I think the names are fairly self-evident. What exactly are you looking for?

There is sysctl as part of busybox entware, btw.

Yes I know, but it's not included in the basic firmware.

 

[Johnathon]

I want to tweak some of the defaults a bit. I am ok/good with unix. I just am not as used to doing it the longer way with cat.

I just want to experiment really, it's an academic exercise to learn and to possibly tweak out a bit more performance.

I have been looking at the vm and wmem etc, settings and want to adjust them. Maybe more.

 

[ColinTaylor]

I can't think of an easy way of displaying the value of every attribute in one go without installing additional software.

The best I can come up with is something like this:

# find /proc/sys
:
:
# find /proc/sys | grep wmem
/proc/sys/vm/lowmem_reserve_ratio
/proc/sys/net/core/wmem_max
/proc/sys/net/core/wmem_default
/proc/sys/net/ipv4/tcp_wmem
/proc/sys/net/ipv4/udp_wmem_min
# cat /proc/sys/net/core/wmem_max
122880