Posted: Thu Jan 30, 2020 19:57 Post subject: Internet Slowdown and High CPU Load
I am fairly new to using a DD-WRT router and have run into a couple of issues that are causing problems. First, the speed I’m purchasing from Comcast is 175MB however what I’m getting is only 26-60MB. When plugging directly into the modem I get the full speed but coming out of the router I get the reduced speeds. I’m not doing any QOS or Wi-Fi and I’m actually doing very little on the router as I only set it up to obtain device level statistics. The second issues is the CPU load is running very high. If I restart it, it will drop down for a short time before jumping back up to 100%.
Any ideas as to what I might try, would be greatly appreciated otherwise I may be forced to pull it out.
Router Name: DD-WRT
Router Model: Netgear WNR3500L v2
Firmware Version: DD-WRT v3.0-r38581M giga (02/06/19)
Kernel Version: Linux 3.10.108-d8 #22809 Wed Feb 6 14:05:03 CET 2019 mips
CPU Model: Broadcom BCM5357 chip rev 2
CPU Cores: 1
CPU Features: MIPS32r1 MIPS32r2 MIPS16 DSP DSP2
CPU Clock: 480 MHz
Load Average: 100% - 1.42, 1.48, 1.49
Temperatures: WL0 46.0 °C
Posted: Fri Jan 31, 2020 0:42 Post subject: Re: Internet Slowdown and High CPU Load
balpaugh wrote:
the speed I’m purchasing from Comcast is 175MB however what I’m getting is only 26-60MB. When plugging directly into the modem I get the full speed [...]
Router Model: Netgear WNR3500L v2
Firmware Version: DD-WRT v3.0-r38581M giga (02/06/19)
The 26-60MB is...
1. Mb/s right, not MB/s?
2. Wired?
Unless there's some reason not to use recent builds, first try 42132. From telnet, `nvram erase && reboot` then manually setup. _________________ #NAT/SFE/CTF: limited speed w/ DD#Repeater issues#DD-WRT info: FAQ, Builds, Types, Modes, Changes, Demo#
OPNsense x64 5050e ITX|DD: DIR-810L, 2*EA6900@1GHz, R6300v1, RT-N66U@663, WNDR4000@533, E1500@353,
WRT54G{Lv1.1,Sv6}@250|FreshTomato: F7D8302@532|OpenWRT: F9K1119v1, RT-ACRH13, R6220, WNDR3700v4
It would be nice to know if anyone is getting the expected speed of your ISP package with an older MIPS router. Are you using any buffer tweaks or anything special at all? _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
Contribute To DD-WRT Pogo - A minimal level of ability is expected and needed... DD-WRT Releases 2023 (PolitePol)
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Linux User #377467 counter.li.org / linuxcounter.net
Because at that time, 42174 only had one report on a k4.4 ARM device, while 42132 had plenty of k3.10 reports. [Of course there have been a couple now on 42174.] I'm happy to flash willy-nilly on my own stuff (lost my own bet messing w/ my OPNsense gateway the other night...leading down a 3hr rabbit hole to fix it) but I'm more hesitant to blindly recommended it to others. _________________ #NAT/SFE/CTF: limited speed w/ DD#Repeater issues#DD-WRT info: FAQ, Builds, Types, Modes, Changes, Demo#
OPNsense x64 5050e ITX|DD: DIR-810L, 2*EA6900@1GHz, R6300v1, RT-N66U@663, WNDR4000@533, E1500@353,
WRT54G{Lv1.1,Sv6}@250|FreshTomato: F7D8302@532|OpenWRT: F9K1119v1, RT-ACRH13, R6220, WNDR3700v4
Posted: Tue Feb 04, 2020 14:17 Post subject: Re: Internet Slowdown and High CPU Load
balpaugh wrote:
I am fairly new to using a DD-WRT router and have run into a couple of issues that are causing problems. First, the speed I’m purchasing from Comcast is 175MB however what I’m getting is only 26-60MB. When plugging directly into the modem I get the full speed but coming out of the router I get the reduced speeds. I’m not doing any QOS or Wi-Fi and I’m actually doing very little on the router as I only set it up to obtain device level statistics. The second issues is the CPU load is running very high. If I restart it, it will drop down for a short time before jumping back up to 100%.
Any ideas as to what I might try, would be greatly appreciated otherwise I may be forced to pull it out.
Router Name: DD-WRT
Router Model: Netgear WNR3500L v2
Firmware Version: DD-WRT v3.0-r38581M giga (02/06/19)
Kernel Version: Linux 3.10.108-d8 #22809 Wed Feb 6 14:05:03 CET 2019 mips
CPU Model: Broadcom BCM5357 chip rev 2
CPU Cores: 1
CPU Features: MIPS32r1 MIPS32r2 MIPS16 DSP DSP2
CPU Clock: 480 MHz
Load Average: 100% - 1.42, 1.48, 1.49
Temperatures: WL0 46.0 °C
Thank you.
I run the same build on one of my routers and I believe the load number shown in the GUI are incorrectly displayed. If I run 'top' from the command line they are low and reasonable. Does not explain the low throughput though. Have no throughput problem with this build on my ASUS AC68U. _________________ Netgear R7000 on Build 55109
Asus AC-AC68U rev. C1 (AP) on Build 55109
Asus AC-68U rev. A1 on Build 54604
Asus AC-68U rev. A1 on Build 53339
CPU
Broadcom BCM4708 + Broadcom BCM4709
CPU Cores 2
CPU Features EDSP
Taktfrequenz 800 MHz + 1000Mhz
Auslastung 100% 2.07, 2.01, 1.93
Temperaturen
CPU 70.8 °C
Last edited by dd-wrt-193 on Tue Feb 04, 2020 15:58; edited 1 time in total
Posted: Tue Feb 04, 2020 15:44 Post subject: Re: 100 % !!!
dd-wrt-193 wrote:
This problem has existed since (DD-WRT v3.0-r38326 std (01/18/19)
all after that up to the current (DD-WRT v3.0-r42174 std (01/30/20)
Always after a short time 100% CPU load!
If you're going to post in the english forum, at least {Google,etc.} translate it first. _________________ #NAT/SFE/CTF: limited speed w/ DD#Repeater issues#DD-WRT info: FAQ, Builds, Types, Modes, Changes, Demo#
OPNsense x64 5050e ITX|DD: DIR-810L, 2*EA6900@1GHz, R6300v1, RT-N66U@663, WNDR4000@533, E1500@353,
WRT54G{Lv1.1,Sv6}@250|FreshTomato: F7D8302@532|OpenWRT: F9K1119v1, RT-ACRH13, R6220, WNDR3700v4
Joined: 08 May 2018 Posts: 14126 Location: Texas, USA
Posted: Tue Feb 04, 2020 17:08 Post subject:
I think the last time I did an actual nvram reset was because of something similar. It was likely around this same time-frame of that build. There have been on-and-off issues with the webUI and such causing strange things happening. I have not seen this happen again here, similar hardware. I'm also running some things that people have clobbered me for, advising against, etc., but have had no issues with my config causing things like this to happen. _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
Contribute To DD-WRT Pogo - A minimal level of ability is expected and needed... DD-WRT Releases 2023 (PolitePol)
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Linux User #377467 counter.li.org / linuxcounter.net
From my experience the httpd service tends to lock-up consuming all available CPU time. Try to restart httpd from the shell. Has always changed CPU load for the better for me on such high load scenarios.
Posted: Wed Feb 05, 2020 15:02 Post subject: Re: Internet Slowdown and High CPU Load
jwh7 wrote:
balpaugh wrote:
the speed I’m purchasing from Comcast is 175MB however what I’m getting is only 26-60MB. When plugging directly into the modem I get the full speed [...]
Router Model: Netgear WNR3500L v2
Firmware Version: DD-WRT v3.0-r38581M giga (02/06/19)
The 26-60MB is...
1. Mb/s right, not MB/s?
2. Wired?
Unless there's some reason not to use recent builds, first try 42132. From telnet, `nvram erase && reboot` then manually setup.
Correct Mb/s and it is wired. I've been hesitant to move to a later revision because of concern of other issues. When I set this up, i had seen may comments of this version working well for them.
So enable SFE, that will speed things up, otherwise all of the processing is done on each packet which causes higher cpu load.
personally I think that the gui stats on those are not always correct
I believe that enabling this did the trick. My CPU has dropped down and my internet speed is now pushing around 180Mb/s.
Thank you very much.
I enabled the SFE and now it appears that my data totals show large variances from what's at the router. From what i've been reading, turning this on can cause that. Is that correct?
Does that mean I ether have to suffer with incredibly slow speeds or incorrect data reporting? Both of the options cause a pain.
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Last edited by balpaugh on Thu Mar 05, 2020 14:09; edited 1 time in total