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Opened 5 years ago

Closed 4 years ago

Last modified 3 years ago

#14001 closed defect (no_response)

DIR-835 Poor Wifi Performance

Reported by: john.baab@… Owned by: developers
Priority: normal Milestone:
Component: packages Version: Trunk
Keywords: DIR-835, WMM Cc:

Description

The default wifi configuration has WMM mode enabled. With WMM enabled my internet speeds were under 0.5mbps, with WMM disabled they are over 20mbps.

Model D-Link DIR-835 rev. A1
Firmware Version OpenWrt Barrier Breaker r37623 / LuCI Trunk (svn-r9873)

Attachments (0)

Change History (13)

comment:1 Changed 5 years ago by nbd

what kind of client device are you using. please post your wifi settings.

comment:2 Changed 4 years ago by anonymous

same issue with WZR-HP-G300NH v1 on Version OpenWrt Barrier Breaker r37660.

comment:3 Changed 4 years ago by nbd

should be fixed in r37713, please try the latest version

comment:4 Changed 4 years ago by nbd

  • Resolution set to worksforme
  • Status changed from new to closed

comment:5 Changed 4 years ago by Duncan Mundell <spam@…>

Hopefully it's ok to comment on a closed ticket.

I can confirm this: running OpenWrt Barrier Breaker r37673 / LuCI Trunk (svn-r9875) DIR-825 B2

I will download and check with latest (Aug 7, 2013) image.

comment:6 Changed 4 years ago by Duncan Mundell <spam@…>

  • Resolution worksforme deleted
  • Status changed from closed to reopened

I can confirm this situation persists on the following config:
OpenWrt Barrier Breaker r37724 / LuCI Trunk (svn-r9875)

Linux (Ubuntu 13.04) client which had no issues with Backfire. Is it ok to re-open this ticket?

comment:7 Changed 4 years ago by nbd

What's "this situation" exactly?

comment:8 Changed 4 years ago by Duncan Mundell <spam@…>

Hi sorry, thought I had commented on this from work but was having gateway issues.

The situation is that as described in the opening report: enabling WMM on wireless networks causes speeds to drop below 0.5Mb/s - basically so slow as to make the wireless practically unusable.

Disabling it restores speeds to usable - up around the 5-10Mb range - not full capacity of the link though. Not sure why this second situation persists, but I figure let's resolve one at a time :)

comment:9 Changed 4 years ago by nbd

What kind of client are you using? Also, please post your wireless configuration.

comment:10 Changed 4 years ago by Duncan Mundell <spam@…>

As stated above in the posts, using an Ubuntu Linux client, as well as various android devices (tablets and phones).

In terms of wireless config, I am not sure specifically what you're after, so here's a dump of iwinfo

wlan0 ESSID: "[redacted]"

Access Point: 84:C9:B2:5C:88:2B
Mode: Master Channel: 1 (2.412 GHz)
Tx-Power: 19 dBm Link Quality: 57/70
Signal: -53 dBm Noise: -95 dBm
Bit Rate: 67.1 MBit/s
Encryption: WPA2 PSK (CCMP)
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:0029 168C:A095 [Atheros AR9223]
TX power offset: none
Frequency offset: none
Supports VAPs: yes PHY name: phy0

wlan1 ESSID: "[redacted]"

Access Point: 84:C9:B2:5C:88:2D
Mode: Master Channel: 36 (5.180 GHz)
Tx-Power: 13 dBm Link Quality: 55/70
Signal: -55 dBm Noise: -95 dBm
Bit Rate: 54.0 MBit/s
Encryption: WPA2 PSK (CCMP)
Type: nl80211 HW Mode(s): 802.11an
Hardware: 168C:0029 168C:A094 [Atheros AR9220]
TX power offset: none
Frequency offset: none
Supports VAPs: yes PHY name: phy1

The specific configuration item that is in question is the WMM mode on the wireless network. When enabled, speeds are very slow, while disabled very high.

I hope this helps, if you need more/different detail please let me know what you need.

Thanks in advance.

comment:11 Changed 4 years ago by nbd

Does the same issue occur with all the clients that you've tested in the same way, or is it just that 'Ubuntu Linux' one?
Also, please provide some more details on that 'Ubuntu Linux' client - what wifi chip/driver is it using?

comment:12 Changed 4 years ago by nbd

  • Resolution set to no_response
  • Status changed from reopened to closed

comment:13 Changed 3 years ago by anonymous

Just adding a note that apparently WMM is required for the "High Throughput" (802.11n) modes, based on this: http://www.smallnetbuilder.com/wireless/wireless-features/30938-dont-mess-with-wmm

Quoting,
"Basically, the 802.11n spec requires devices to support 802.11e (Quality of Service [QoS] enhancements for wireless LAN) in order to use HT (High Throughput) link rates, i.e. higher than 54 Mbps. (WMM is a subset of 802.11e that was created by the Wi-Fi Alliance as a stop-gap measure while 802.11e made its way slowly through the IEEE review process.) WMM's Traffic Identifier (TID) field is key to aggregation mechanisms, including block acknowledgement (block ACK), that enable 802.11n's high throughput rates."

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