QoS enabling lowers download speed

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ragram
DD-WRT Novice


Joined: 31 Aug 2017
Posts: 2

PostPosted: Thu Aug 31, 2017 13:47    Post subject: QoS enabling lowers download speed Reply with quote
After spending many hours searching, and trying, I need your help!

Whenever I turn on QoS my download speed goes down significantly. Toggling it back disable, makes the speed back to what is expected from ISP.

I understand there can be 20% drop, but I'm seeing more than 50-60%

ISP Plan (Comcast/Xfinity Blast Pro): 150 - 200 Mbs. I see it directly connected and w/o DD-WRT QoS

With DD-WRT QoS enabled, with no per device or per service setting I get only about 50 to 70 Mbs.

I have tried several settings and removed per MAC/ and per service settings to keep it simple.
Current QoS setting: WAN & LAN (as recommended for Bridge modem)
Tried: HFSC, and HTB
Tried: FQ_CODEL
Enabled: ACK, SYN, FIN, RST,
NO: Service/Interface/MAC Priority

Linksys WRT1900 ac v1
DD-WRT v3.0-r33257 std (08/29/17)
Comcast/Xfinity - Cable Modem (Arris) Bridgemode
Sponsor
mrjcd
DD-WRT Guru


Joined: 31 Jan 2015
Posts: 5262
Location: Texas

PostPosted: Thu Aug 31, 2017 22:33    Post subject: Reply with quote
You should consider using the previous dd-wrt build or another.
Seems to be some QOS issues w/r33257
You will probably find answers in the correct forum
Marvell forum >>> http://www.dd-wrt.com/phpBB2/viewforum.php?f=58
ragram
DD-WRT Novice


Joined: 31 Aug 2017
Posts: 2

PostPosted: Thu Aug 31, 2017 22:50    Post subject: QoS enabling lowers download speed Reply with quote
Until y'day I was using the older version (last published one from 2015), and it had the same issue.
I did search and try settings from the forums, but didn't see the exact issues reported from others.

I will research again in the forum you pointed at (Marvel).

Thank you.
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