Cannot change rmem_max

[exoxon]

Is it not possible to change rmem_max permanently via nano /jffs/scripts/init-start (echo *value* > /proc/sys/net/core/rmem_max)? Every change i made in here survives reboot, except this one goes back and back again to 2500000.
Is there another way to change this value?

 

[RMerlin]

Maybe the firmware changes it itself during boot. Try to make the change happen later during the boot process.

 

[exoxon]

Maybe the firmware changes it itself during boot. Try to make the change happen later during the boot process.

added echo command to /jffs/scripts/service-event and it worked, thank you!

 

[RMerlin]

Try services-start instead, so it won`t be executed every time there is a router service event occuring.

 

[exoxon]

Try services-start instead, so it won`t be executed every time there is a router service event occuring.

you meant /jffs/scripts/services-start right? ignored, gone back to default.

 

[ColinTaylor]

Every change i made in here survives reboot, except this one goes back and back again to 2500000.

Are you using AdGuardHome? That changes rmem_max to 2500000.

 

[exoxon]

Are you using AdGuardHome? That changes rmem_max to 2500000.

Yes i am! why on earth AGH changes that? WOW

 

[ColinTaylor]

Yes i am! why on earth AGH changes that?

No idea. Maybe ask the person that created the installer script. @SomeWhereOverTheRainBow ?

Asuswrt-Merlin-AdGuardHome-Installer/AdGuardHome.sh at 1ce1e233cfda034c6ef9355730aa275121a5f453 · jumpsmm7/Asuswrt-Merlin-AdGuardHome-Installer

The Official Installer of AdGuardHome for Asuswrt-Merlin - jumpsmm7/Asuswrt-Merlin-AdGuardHome-Installer

github.com

proc_optimizations () {
  { printf "4194304" > /proc/sys/kernel/pid_max; }; # Ensure max PID coverage
  { printf "2" > /proc/sys/vm/overcommit_memory; }; # Ensure ratio algorithm checks properly work including swap.
  { printf "2500000" > /proc/sys/net/core/rmem_max; }; # Ensure UDP receive buffer set to 2.5M.
  { printf "0" > /proc/sys/net/ipv4/icmp_ratelimit; }; # Ensure Control over MTRS
  { printf "256" > /proc/sys/net/ipv4/neigh/default/gc_thresh1; }; # Increase ARP cache sizes and GC thresholds
  { printf "1024" > /proc/sys/net/ipv4/neigh/default/gc_thresh2; }; # Increase ARP cache sizes and GC thresholds
  { printf "2048" > /proc/sys/net/ipv4/neigh/default/gc_thresh3; }; # Increase ARP cache sizes and GC thresholds
  { printf "240" > /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_max_retrans; }; # Lower conntrack tcp_timeout_max_retrans from 300 to 240
  if [ -n "$(nvram get ipv6_service)" ]; then #IPV6 proc variants
    { printf "0" > /proc/sys/net/ipv6/icmp/ratelimit; };
    { printf "256" > /proc/sys/net/ipv6/neigh/default/gc_thresh1; };
    { printf "1024" > /proc/sys/net/ipv6/neigh/default/gc_thresh2; };
    { printf "2048" > /proc/sys/net/ipv6/neigh/default/gc_thresh3; };
  fi;
}

 

[RMerlin]

No idea. Maybe ask the person that created the installer script. @SomeWhereOverTheRainBow ?

Asuswrt-Merlin-AdGuardHome-Installer/AdGuardHome.sh at 1ce1e233cfda034c6ef9355730aa275121a5f453 · jumpsmm7/Asuswrt-Merlin-AdGuardHome-Installer

The Official Installer of AdGuardHome for Asuswrt-Merlin - jumpsmm7/Asuswrt-Merlin-AdGuardHome-Installer

github.com

proc_optimizations () {
  { printf "4194304" > /proc/sys/kernel/pid_max; }; # Ensure max PID coverage
  { printf "2" > /proc/sys/vm/overcommit_memory; }; # Ensure ratio algorithm checks properly work including swap.
  { printf "2500000" > /proc/sys/net/core/rmem_max; }; # Ensure UDP receive buffer set to 2.5M.
  { printf "0" > /proc/sys/net/ipv4/icmp_ratelimit; }; # Ensure Control over MTRS
  { printf "256" > /proc/sys/net/ipv4/neigh/default/gc_thresh1; }; # Increase ARP cache sizes and GC thresholds
  { printf "1024" > /proc/sys/net/ipv4/neigh/default/gc_thresh2; }; # Increase ARP cache sizes and GC thresholds
  { printf "2048" > /proc/sys/net/ipv4/neigh/default/gc_thresh3; }; # Increase ARP cache sizes and GC thresholds
  { printf "240" > /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_max_retrans; }; # Lower conntrack tcp_timeout_max_retrans from 300 to 240
  if [ -n "$(nvram get ipv6_service)" ]; then #IPV6 proc variants
    { printf "0" > /proc/sys/net/ipv6/icmp/ratelimit; };
    { printf "256" > /proc/sys/net/ipv6/neigh/default/gc_thresh1; };
    { printf "1024" > /proc/sys/net/ipv6/neigh/default/gc_thresh2; };
    { printf "2048" > /proc/sys/net/ipv6/neigh/default/gc_thresh3; };
  fi;
}

That script shouldn`t blindly write system values without checking first what the current values are. Otherwise, it might override something else that needs different or higher values (like the user does here).