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raymondr15
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RB2011UiAS-RM LCD Causing high CPU and ping spikes

Mon Sep 12, 2016 9:11 pm

Hi,

When testing the RB2011UiAS-RM with LCD turned on I get random ping spikes and CPU runs +- 10% without passing any traffic.
Looking at tool>profile I can see SPI and unclassified +-5% each.
I know that SPI is for the LCD but a few versions earlier I don't think unclassified was involved, when turning the LCD off, both unclassified and SPI go to 0% and ping and CPU returns normal.
Also, my LCD is set to display only one screen and that is my WAN traffic, nothing else.

The ping spikes aren't high but It's just really annoying knowing that there are ping spikes and can also affect different traffic and also don't get the same throughput as I would when LCD off.

LCD off:
Normal.PNG
LCD on:
Abnormal.PNG
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mrz
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Tue Sep 13, 2016 11:36 am

Some time ago something similar was fixed. Which ROS version you are using?
 
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Cha0s
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 2:04 pm

Hi,

When testing the RB2011UiAS-RM with LCD turned on I get random ping spikes and CPU runs +- 10% without passing any traffic.
Looking at tool>profile I can see SPI and unclassified +-5% each.
I know that SPI is for the LCD but a few versions earlier I don't think unclassified was involved, when turning the LCD off, both unclassified and SPI go to 0% and ping and CPU returns normal.
Also, my LCD is set to display only one screen and that is my WAN traffic, nothing else.

The ping spikes aren't high but It's just really annoying knowing that there are ping spikes and can also affect different traffic and also don't get the same throughput as I would when LCD off.

LCD off:
Normal.PNG

LCD on:
Abnormal.PNG
Same on RB3011.
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 2:20 pm

Hi,

When testing the RB2011UiAS-RM with LCD turned on I get random ping spikes and CPU runs +- 10% without passing any traffic.
Looking at tool>profile I can see SPI and unclassified +-5% each.
I know that SPI is for the LCD but a few versions earlier I don't think unclassified was involved, when turning the LCD off, both unclassified and SPI go to 0% and ping and CPU returns normal.
Also, my LCD is set to display only one screen and that is my WAN traffic, nothing else.

The ping spikes aren't high but It's just really annoying knowing that there are ping spikes and can also affect different traffic and also don't get the same throughput as I would when LCD off.

LCD off:
Normal.PNG

LCD on:
Abnormal.PNG
Same on RB3011.
I wanted to purchase one of those too... This is ridiculous that the LCD has to kill resources!

CPU Usage sits at 9% without passing traffic:
CPU.PNG
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leoktv
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 3:58 pm

Back to the question from mrz that routerOS version are you having?
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 5:02 pm

Back to the question from mrz that routerOS version are you having?
Sorry, missed the post, I'm using the current latest (6.36.3)
 
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mrz
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 5:09 pm

Please contact support with attached supout file.
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 14, 2016 11:50 pm

Please contact support with attached supout file.
Will do.
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 1:54 pm

Please contact support with attached supout file.
Sent the mail to support and there is no solution yet.
Capture.PNG
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paulct
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 2:08 pm

I just disable the LCD's on all our mikrotik kit. Don't need them, do not want to worry that there *may* be a performance drop.
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 2:14 pm

I just disable the LCD's on all our mikrotik kit. Don't need them, do not want to worry that there *may* be a performance drop.

I see what you are saying but the thing is for the people who purchased the specific model that has the LCD screen now cannot make use of it if they want full performance which is not great at all, same thing with me, I use the LCD to check throughput without having the need to login all the time.

Yes there *is* a performance drop with the LCD turned on, I have tested it.
 
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normis
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 3:48 pm

Each time the screen is drawn, the cpu can jump ~5%. We can optimize how often it is re-drawn, but some kind of CPU increase will be there, because any action requires the CPU. This includes all things you do in the device.
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 10:04 pm

Each time the screen is drawn, the cpu can jump ~5%. We can optimize how often it is re-drawn, but some kind of CPU increase will be there, because any action requires the CPU. This includes all things you do in the device.

I understand but the 5% CPU draw should not cause ping spikes and affect performance by a large amount.

The ~5% are spikes and not solid CPU draw, with the LCD on and a spike not hit yet, the overall performance is affected without the spike happening yet.

I can run the router at 90% and sometimes 100% CPU draw and still have 0-1ms latency with the LCD off.
 
InoX
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Wed Sep 21, 2016 11:18 pm

Each time the screen is drawn, the cpu can jump ~5%. We can optimize how often it is re-drawn, but some kind of CPU increase will be there, because any action requires the CPU. This includes all things you do in the device.
Does this apply and if the lcd is in "standby" mode ? Or only if it is used?
 
raymondr15
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Thu Sep 22, 2016 12:07 am

Each time the screen is drawn, the cpu can jump ~5%. We can optimize how often it is re-drawn, but some kind of CPU increase will be there, because any action requires the CPU. This includes all things you do in the device.
Does this apply and if the lcd is in "standby" mode ? Or only if it is used?

When you say "standby mode" do you mean when the back-light is off?
 
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robmaltsystems
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Re: RB2011UiAS-RM LCD Causing high CPU and ping spikes

Fri Jan 06, 2023 12:56 pm

Returning a long post but this never was fixed as just had same with new unit on latest RouterOS. The spike tends to be when the stats screen is shown. Doesn't seem as noticeable with the main page. I've configured the touchscreen to turn off after 5 mins, not the default of 30.

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