Arch Linux

comicosmos

Member

From: suzhou, China mainland

Registered: 2011-04-16

Posts: 45

slow network speed in archLinux ONLY after using a new wifi router

Hi,

I have recently upgraded the wifi router with a new model at home. Basically it offers stronger signal, 2.4G/5G support(mainly for newer hardware such as phones)...

However the network speed in archlinux was degraded from normally 2M/s to 20k/s. The computer also dual boots with win 8. The network speed at win 8 is functioning very well.
So it should be a network driver fine tune issue under linux, well, a territory I do not know. And there's little helpful google result...

What can I do, where shall I start to look at, any ideas?

Really appreciated.

Last edited by comicosmos (2017-04-19 16:21:56)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,348

Re: slow network speed in archLinux ONLY after using a new wifi router

If only we knew what wireless chip set you are using.
Or what you are using to control your wireless setup.
Or information about your network state that might be provided by iw phy or iw devicename info    (where devicename is the name of your wireless NIC)

---

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Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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comicosmos

Member

From: suzhou, China mainland

Registered: 2011-04-16

Posts: 45

Re: slow network speed in archLinux ONLY after using a new wifi router

Oh. Sorry for lacking of basic info.

udev discovers the hardware during boot and auto loads drivers, I guess.
openbox and perhaps systemd auto load NetworkManager Applet and the applet shows up at lxpanel system tray area automatically.

lspci -vnn
02:00.0 Network controller [0280]: Broadcom Limited BCM43225 802.11b/g/n [14e4:4357] (rev 01)
        Subsystem: Broadcom Limited Device [14e4:04da]
        Flags: bus master, fast devsel, latency 0, IRQ 17
        Memory at feafc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [58] Vendor Specific Information: Len=78 <?>
        Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [d0] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [13c] Virtual Channel
        Capabilities: [160] Device Serial Number 00-00-7a-ff-ff-09-20-10
        Capabilities: [16c] Power Budgeting <?>
        Kernel driver in use: bcma-pci-bridge
        Kernel modules: bcma

$iw wlp2s0b1 info
Interface wlp2s0b1
        ifindex 3
        wdev 0x1
        addr 20:10:7a:09:52:05
        type managed
        wiphy 0
        channel 7 (2442 MHz), width: 20 MHz, center1: 2442 MHz
        txpower 19.00 dBm

$iw phy
Wiphy phy0
    max # scan SSIDs: 4
    max scan IEs length: 2257 bytes
    max # sched scan SSIDs: 0
    max # match sets: 0
    max # scan plans: 1
    max scan plan interval: -1
    max scan plan iterations: 0
    Retry short limit: 7
    Retry long limit: 4
    Coverage class: 0 (up to 0m)
    Device supports RSN-IBSS.
    Supported Ciphers:
        * WEP40 (00-0f-ac:1)
        * WEP104 (00-0f-ac:5)
        * TKIP (00-0f-ac:2)
        * CCMP-128 (00-0f-ac:4)
        * CCMP-256 (00-0f-ac:10)
        * GCMP-128 (00-0f-ac:8)
        * GCMP-256 (00-0f-ac:9)
    Available Antennas: TX 0 RX 0
    Supported interface modes:
         * IBSS
         * managed
         * AP
         * AP/VLAN
         * monitor
    Band 1:
        Capabilities: 0x70
            HT20
            Static SM Power Save
            RX Greenfield
            RX HT20 SGI
            RX HT40 SGI
            No RX STBC
            Max AMSDU length: 3839 bytes
            No DSSS/CCK HT40
        Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
        Minimum RX AMPDU time spacing: 8 usec (0x06)
        HT Max RX data rate: 500 Mbps
        HT TX/RX MCS rate indexes supported: 0-15
        Bitrates (non-HT):
            * 1.0 Mbps
            * 2.0 Mbps (short preamble supported)
            * 5.5 Mbps (short preamble supported)
            * 11.0 Mbps (short preamble supported)
            * 6.0 Mbps
            * 9.0 Mbps
            * 12.0 Mbps
            * 18.0 Mbps
            * 24.0 Mbps
            * 36.0 Mbps
            * 48.0 Mbps
            * 54.0 Mbps
        Frequencies:
            * 2412 MHz [1] (19.0 dBm)
            * 2417 MHz [2] (19.0 dBm)
            * 2422 MHz [3] (19.0 dBm)
            * 2427 MHz [4] (19.0 dBm)
            * 2432 MHz [5] (19.0 dBm)
            * 2437 MHz [6] (19.0 dBm)
            * 2442 MHz [7] (19.0 dBm)
            * 2447 MHz [8] (19.0 dBm)
            * 2452 MHz [9] (19.0 dBm)
            * 2457 MHz [10] (19.0 dBm)
            * 2462 MHz [11] (19.0 dBm)
            * 2467 MHz [12] (19.0 dBm)
            * 2472 MHz [13] (19.0 dBm) (no IR)
            * 2484 MHz [14] (disabled)
    Supported commands:
         * new_interface
         * set_interface
         * new_key
         * start_ap
         * new_station
         * new_mpath
         * set_mesh_config
         * set_bss
         * authenticate
         * associate
         * deauthenticate
         * disassociate
         * join_ibss
         * join_mesh
         * set_tx_bitrate_mask
         * frame
         * frame_wait_cancel
         * set_wiphy_netns
         * set_channel
         * set_wds_peer
         * probe_client
         * set_noack_map
         * register_beacons
         * start_p2p_device
         * set_mcast_rate
         * set_qos_map
         * connect
         * disconnect
    Supported TX frame types:
         * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
         * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
    Supported RX frame types:
         * IBSS: 0x40 0xb0 0xc0 0xd0
         * managed: 0x40 0xd0
         * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
         * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
         * mesh point: 0xb0 0xc0 0xd0
         * P2P-client: 0x40 0xd0
         * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
         * P2P-device: 0x40 0xd0
    software interface modes (can always be added):
         * AP/VLAN
         * monitor
    interface combinations are not supported
    HT Capability overrides:
         * MCS: ff ff ff ff ff ff ff ff ff ff
         * maximum A-MSDU length
         * supported channel width
         * short GI for 40 MHz
         * max A-MPDU length exponent
         * min MPDU start spacing
    Device supports TX status socket option.
    Device supports HT-IBSS.
    Device supports SAE with AUTHENTICATE command
    Device supports low priority scan.
    Device supports scan flush.
    Device supports AP scan.
    Device supports per-vif TX power setting
    Driver supports full state transitions for AP/GO clients
    Driver supports a userspace MPM
    Device supports configuring vdev MAC-addr on create.

Last edited by comicosmos (2017-04-19 17:22:44)

sethlivingston

Member

Registered: 2017-04-22

Posts: 1

Re: slow network speed in archLinux ONLY after using a new wifi router

I'm having the same problem. I'll wait to post my specs so I don't interrupt the OP, but I switched away from a USB WiFi adapter (which I was tired of jacking with anyway) to a wired connection to a WiFi extender. The results are the same: my download speeds are significantly slower on Arch Linux than on other devices and OSes.