Hardware Acceleration - R7000

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s-f-r-j
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Joined: 27 Sep 2011
Posts: 236

PostPosted: Thu Mar 05, 2015 16:43    Post subject: Hardware Acceleration - R7000 Reply with quote
Hey Kong, BS,

Do you guys think hardware acceleration will be \ fixed \ implemented any time soon?

My ISP is upgrading their tiers (a lot lately) and - so far, what i have works fine, but, i am afraid on the next upgrade i might not be able to pull full speeds?

I attached CPU usage (only once core is doing work, probably hardware acceleration is the reason?) on 320+ mbit from my ISP.

Thanks



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slidermike
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PostPosted: Thu Mar 05, 2015 19:02    Post subject: Reply with quote
s-f-r-j,

There is no ddtb/ctf (hardware acceleration) currently in ddwrt. If your doing ipv4 (nat) then its all cpu bound along with most other services like vpn.
ddwrt is running Linux I believe and there is not a lot of multi-core optimization out of the box.
There are commands you can add to your start up script but you will have to research those.

I use some custom startup scripts another forum member shared about a year ago.

One of them assigns each cpu to service a specific radio.

If you want to try it, add this to your start up script. It is all 1 line.

echo 2 > /proc/irq/163/smp_affinity && echo 1 > /proc/irq/169/smp_affinity

_________________
Router currently owned:
Netgear R7800 - Router
Netgear R7000 - AP mode

R7000 specific Tips/Tricks.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=264152


Last edited by slidermike on Thu Mar 05, 2015 20:29; edited 1 time in total
boochi99
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PostPosted: Thu Mar 05, 2015 20:25    Post subject: Reply with quote
I don't think your scripts have anything to do with the ops question about hardware acceleration. He is talking about wan side speed.
slidermike
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PostPosted: Thu Mar 05, 2015 20:28    Post subject: Reply with quote
You are correct boochi.
The scripts were offered as a free method of offloading some resources to a 2nd cpu if he wanted to.
Further down in my post you will see that those statements actually are relevant to his question about WAN acceleration.
Unless I misunderstood what I was reading.

I probably should have arranged the response part to the top of my post and the offer of a startup script as the 2nd portion.
boochi99 wrote:
I don't think your scripts have anything to do with the ops question about hardware acceleration. He is talking about wan side speed.

_________________
Router currently owned:
Netgear R7800 - Router
Netgear R7000 - AP mode

R7000 specific Tips/Tricks.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=264152
s-f-r-j
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Joined: 27 Sep 2011
Posts: 236

PostPosted: Thu Mar 05, 2015 21:18    Post subject: Reply with quote
Thank you, i will give it a try.

Is there a way to make sure this was applied properly after reboot?

Thanks

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slidermike
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PostPosted: Thu Mar 05, 2015 21:21    Post subject: Reply with quote
Run this command to see some of whats on each cpu.
cat /proc/interrupts

I am no pro at it. I used someone elses posted script.
I suggest maybe doing a google search.
You will probably get an explanation to what your seeing.

There is another command "top".
It refreshes every couple seconds & shows you a list of resources & what is consuming each cpu. To cancel it, press the "q" key.

_________________
Router currently owned:
Netgear R7800 - Router
Netgear R7000 - AP mode

R7000 specific Tips/Tricks.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=264152


Last edited by slidermike on Fri Mar 06, 2015 20:15; edited 1 time in total
s-f-r-j
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Joined: 27 Sep 2011
Posts: 236

PostPosted: Thu Mar 05, 2015 21:25    Post subject: Reply with quote
Code:

root@CACTUS:~# cat /proc/interrupts
           CPU0       CPU1       
 27:         12          0       GIC  mpcore_gtimer
 29:      19281      19280       GIC  twd
111:          0        390       GIC  ehci_hcd:usb1, ohci_hcd:usb2
112:          0          1       GIC 
117:      27423          0       GIC  serial
163:          0      21654       GIC  eth1
169:       6104         42       GIC  eth2
179:      51058          0       GIC  eth0
IPI0:         0          0       CPU wakeup interrupts
IPI1:         0          1       Timer broadcast interrupts
IPI2:      5391       5476       Rescheduling interrupts
IPI3:         0          0       Function call interrupts
IPI4:        49         21       Single function call interrupts
IPI5:         0          0       CPU stop interrupts
Err:          0
root@CACTUS:~#


Does it looks as it should after applying the command?

Thanks for help slidermike, i appreciate it a lot.

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slidermike
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PostPosted: Thu Mar 05, 2015 21:31    Post subject: Reply with quote
s-f-r-j,
here is what I did when I ran the command the first time last year. So I could see what (if anything) it was doing.

I ran the command from the command line (after reboot to make sure it was started).

Then I hit a large file transfer over 2.4. Streaming a movie or just a move from pc to pc.

Looking specifically at
163: eth1
169: eth2
179: eth0

Then I switched to the 5 and repeated the same or another large file move/stream & ran the command from the command line again.

You should see while moving constant data over 2.4, 1 of the 3 lines count up (keep issuing the command, its not real time).
Repeat for 5ghz.

_________________
Router currently owned:
Netgear R7800 - Router
Netgear R7000 - AP mode

R7000 specific Tips/Tricks.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=264152
slidermike
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Joined: 11 Nov 2013
Posts: 1487
Location: USA

PostPosted: Thu Mar 05, 2015 21:38    Post subject: Reply with quote
This resource is pretty good at explaining the echo (cpu) & affinity commands.
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/s-cpu-irq.html


irq 163 - eth1 - 2.4ghz
irq 169 - eth2 - 5ghz


With that info you could really tell which cpu is allowed to handle which irq function.

_________________
Router currently owned:
Netgear R7800 - Router
Netgear R7000 - AP mode

R7000 specific Tips/Tricks.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=264152
s-f-r-j
DD-WRT User


Joined: 27 Sep 2011
Posts: 236

PostPosted: Fri Mar 06, 2015 0:08    Post subject: Reply with quote
Thanks a lot slidermike.

I've decided to set both 2 and 5 ghz radio to cpu 2.

lets see how this will perform Smile

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s-f-r-j
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Posts: 236

PostPosted: Fri Mar 06, 2015 0:15    Post subject: Reply with quote
Some tests:

I am transfering ISO file from my PC to Laptop (Wi-Fi 2Ghz) while doing downloads from Internet to my PC, around 150-200mbit (down)



I added a speed test from my phone 5GHz:



Code:
root@CACTUS:~# cat /proc/interrupts
           CPU0       CPU1       
 27:         12          0       GIC  mpcore_gtimer
 29:     444403     444394       GIC  twd
111:          0        408       GIC  ehci_hcd:usb1, ohci_hcd:usb2
112:          0          1       GIC 
117:      39256          0       GIC  serial
163:          0     562357       GIC  eth1
169:          0     254629       GIC  eth2
179:    8930045          0       GIC  eth0
IPI0:         0          0       CPU wakeup interrupts
IPI1:         0          1       Timer broadcast interrupts
IPI2:     33749      35814       Rescheduling interrupts
IPI3:         0          0       Function call interrupts
IPI4:        39         32       Single function call interrupts
IPI5:         0          0       CPU stop interrupts
Err:          0


I would say this helps a lot - at least both cores are being utilized - rather then one pushing most of stuff?

Thanks!

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tigs
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PostPosted: Sat Mar 07, 2015 5:14    Post subject: Reply with quote
s-f-r-j wrote:
Some tests:


I would say this helps a lot - at least both cores are being utilized - rather then one pushing most of stuff?

Thanks!


Hi s-f-r-j,

what is your script like?

thanks
s-f-r-j
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Joined: 27 Sep 2011
Posts: 236

PostPosted: Sat Mar 07, 2015 6:35    Post subject: Reply with quote
tigs, what do you mean?
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s-f-r-j
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PostPosted: Sat Mar 07, 2015 6:35    Post subject: Reply with quote
You mean, what is the command i use for this, as start-up script?

thanks

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tigs
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PostPosted: Sat Mar 07, 2015 15:02    Post subject: Reply with quote
s-f-r-j wrote:
You mean, what is the command i use for this, as start-up script?

thanks


yes

Code:
echo 2 > /proc/irq/163/smp_affinity && echo 2 > /proc/irq/169/smp_affinity


I see your CPU0 is 0. mine still has some low reading at CPU0, not zero. is that normal?
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