Posted: Tue Nov 28, 2017 20:36 Post subject: Netgear R7800 much slower WAN->LAN than Linksys 1900ACS
I own a Netgear R7800 running Kong's DD-WRt 33770 and a Linksys 1900ACS (V1) with BS DD-WRT 33772. On both "Shortcut Forwarding Engine" is disabled because I use policy based routing in the VPN client. My internet connection is a fiber 1 Gigabit line.
In speedtests (not going over the VPN tunnel!) connected by LAN I get constant speeds of 800 Mbit up and 900 Mbit down on the Linksys 1900ACS, but the Netgear R7800 "only" gets 550 MbIt up/down. And this even though the specs of the 7800 are better. Same problem with all DD-WRT firmware versions on both routers in the last 6 months.
Does anybody have an explanation why the linksys outperforms the R7800 that much?
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Nov 28, 2017 21:21 Post subject:
issue the command to the r7800 exactly as is without the "
"echo 2 > /proc/irq/255/smp_affinity"
will it magically make it take gigabit? probably not, but itll be closer. as for this whole "with ddwrt or x 3rd party firmware i cant get gigabit anymore etc" its not new, it should be expected, & its everywhere.. 4 second search i already find posts on it.. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
issue the command to the r7800 exactly as is without the "
"echo 2 > /proc/irq/255/smp_affinity"
will it magically make it take gigabit? probably not, but itll be closer. as for this whole "with ddwrt or x 3rd party firmware i cant get gigabit anymore etc" its not new, it should be expected, & its everywhere.. 4 second search i already find posts on it..
Thanks for your quick reply! I ran the command and its a bit faster (630 up/580 down compared to 550/550 before). I'll do another test in the morning, maybe I can't max out the line now because there is more traffic in the evening.
When I save this as "Save startup", the command will be run automatically at reboot?
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Nov 28, 2017 22:45 Post subject:
Alozaros wrote:
well, tatsuya46 are this 2 lines are obsolete:
echo 2 > /proc/irq/67/smp_affinity
echo 2 > /proc/irq/89/smp_affinity
and replaced by
echo 2 > /proc/irq/255/smp_affinity
no those are for each wifi radio, 255 is for the wan interface, wan generates more interrupts, but anything in the list of cat /proc/interrupts can be shuffled around to whatever u want
p4p4 wrote:
tatsuya46 wrote:
issue the command to the r7800 exactly as is without the "
"echo 2 > /proc/irq/255/smp_affinity"
will it magically make it take gigabit? probably not, but itll be closer. as for this whole "with ddwrt or x 3rd party firmware i cant get gigabit anymore etc" its not new, it should be expected, & its everywhere.. 4 second search i already find posts on it..
Thanks for your quick reply! I ran the command and its a bit faster (630 up/580 down compared to 550/550 before). I'll do another test in the morning, maybe I can't max out the line now because there is more traffic in the evening.
When I save this as "Save startup", the command will be run automatically at reboot?
yes & u can also try adding "for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done" without " to startup on a separate line from the first command, to disable cpu scaling, always at 1.7ghz (unlike the affinity change, this one needs a reboot to have effect), but the scaling logic is better now so maybe only a few more mbps at best _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
I just tested again on the R7800 using the "echo 2 > /proc/irq/255/smp_affinity" command and now I get constant 650up/650down speeds over LAN. That is 100MBit faster than without the command.
Still wondering why the Linkssys 1900ACS manages to get 800/900MBit with DD-WRT. Maybe its the 4.4 Kernel versus the 3.18 Kernel?
You ROCK tatsuya46!! Using these 2 commands fixed my slow download speed on my Nighthawk R7800 Router!! The first helped a little but the second made it work like on the stock firmware!! THANK YOU!!
echo 2 > /proc/irq/255/smp_affinity
for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done
