slow connection

slow connection

[Evgeniy Dushistov]

Hi,

I used linux 3.16.3 and b43 driver with firmware version 784.2.
$iwconfig
wlp4s0    IEEE 802.11bg  ESSID:"some sid"
          Mode:Managed  Frequency:2.437 GHz  Access Point: 60:A4:4C:F0:DF:80
          Bit Rate=24 Mb/s   Tx-Power=20 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=70/70  Signal level=-27 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:18981  Invalid misc:16901   Missed beacon:0

$lspci -v
04:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)
        Subsystem: Apple Inc. AirPort Extreme
        Flags: bus master, fast devsel, latency 0, IRQ 17
        Memory at c1900000 (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 dc-cb-e9-ff-ff-16-28-cf
        Capabilities: [16c] Power Budgeting <?>
        Kernel driver in use: bcma-pci-bridge
        Kernel modules: bcma

to test speed I download file from wifi router with usb disk.

Under linux I got:
time curl  'ftp://192.168.1.1/somefile' -o res
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 2147M  100 2147M    0     0   403k      0  1:30:52  1:30:52 --:--:--  478k

real    90m52.745s
user    1m1.120s
sys     1m22.670s


On the same notebook, at the same place, but under Mac OS X I got:
time curl 'ftp://192.168.1.1/somefile' -o res
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 2147M  100 2147M    0     0  8379k      0  0:04:22  0:04:22 --:--:-- 6801k

real	4m22.479s
user	0m9.149s
sys	0m31.209s

So it is 3.18 Mbit/s vs 71.57 MBit/s under the same conditions,
and the only difference is OS.

Any hints, how to speedup connection under linux?

-- 
/Evgeniy

slow connection

[Rafał Miłecki]

On 31 October 2014 20:00, Evgeniy Dushistov <dushistov@mail.ru> wrote:
> I used linux 3.16.3 and b43 driver with firmware version 784.2.
> $iwconfig
> wlp4s0    IEEE 802.11bg  ESSID:"some sid"
>           Mode:Managed  Frequency:2.437 GHz  Access Point: 60:A4:4C:F0:DF:80
>           Bit Rate=24 Mb/s   Tx-Power=20 dBm
>           Retry short limit:7   RTS thr:off   Fragment thr:off
>           Encryption key:off
>           Power Management:off
>           Link Quality=70/70  Signal level=-27 dBm
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:18981  Invalid misc:16901   Missed beacon:0
>
> $lspci -v
> 04:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)
>         Subsystem: Apple Inc. AirPort Extreme
>         Flags: bus master, fast devsel, latency 0, IRQ 17
>         Memory at c1900000 (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 dc-cb-e9-ff-ff-16-28-cf
>         Capabilities: [16c] Power Budgeting <?>
>         Kernel driver in use: bcma-pci-bridge
>         Kernel modules: bcma
>
> to test speed I download file from wifi router with usb disk.
>
> Under linux I got:
> time curl  'ftp://192.168.1.1/somefile' -o res
>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
>                                  Dload  Upload   Total   Spent    Left  Speed
> 100 2147M  100 2147M    0     0   403k      0  1:30:52  1:30:52 --:--:--  478k
>
> real    90m52.745s
> user    1m1.120s
> sys     1m22.670s
>
>
> On the same notebook, at the same place, but under Mac OS X I got:
> time curl 'ftp://192.168.1.1/somefile' -o res
>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
>                                  Dload  Upload   Total   Spent    Left  Speed
> 100 2147M  100 2147M    0     0  8379k      0  0:04:22  0:04:22 --:--:-- 6801k
>
> real    4m22.479s
> user    0m9.149s
> sys     0m31.209s
>
> So it is 3.18 Mbit/s vs 71.57 MBit/s under the same conditions,
> and the only difference is OS.
>
> Any hints, how to speedup connection under linux?

We have some improvements for HT-PHY (BCM4331) in 3.18-rc1 (and
newer). Could you try it?

b43 is still limited to 802.11g speeds, but I hope it will be better
than 3.18 Mb/s.

-- 
Rafa?

slow connection

[Evgeniy Dushistov]

On Fri, Oct 31, 2014 at 09:12:39PM +0100, Rafa? Mi?ecki wrote:
> > So it is 3.18 Mbit/s vs 71.57 MBit/s under the same conditions,
> > and the only difference is OS.
> >
> > Any hints, how to speedup connection under linux?
> 
> We have some improvements for HT-PHY (BCM4331) in 3.18-rc1 (and
> newer). Could you try it?
> 
> b43 is still limited to 802.11g speeds, but I hope it will be better
> than 3.18 Mb/s.
> 

I got:
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 2147M  100 2147M    0     0  2246k      0  0:16:18  0:16:18 --:--:-- 1842k

real    16m18.774s
user    0m27.340s
sys     0m36.350s

This is ~ 17.55Mbit/s for file transfer.
What is much, much better. Thank you.

Are these changes(3.16 [slow b43] vs 3.18 [fast b43]) located 
in drivers/net/wireless/b43?
I would like to port them(changes) to my 3.16 kernel.

By the way, during test connection was hang,
and I can not ping any machine outside of my notebook.

I rmmod/modprobe b43, restart wpa_supplicant/dhcpcd
and all back to normal. 
And after restart I was unable to reproduce it(bug).
dmesg also show nothing. Any hints how to debug such
kind of issues, if I see it again?


-- 
/Evgeniy

slow connection

[Rafał Miłecki]

On 31 October 2014 23:41, Evgeniy Dushistov <dushistov@mail.ru> wrote:
> On Fri, Oct 31, 2014 at 09:12:39PM +0100, Rafa? Mi?ecki wrote:
>> > So it is 3.18 Mbit/s vs 71.57 MBit/s under the same conditions,
>> > and the only difference is OS.
>> >
>> > Any hints, how to speedup connection under linux?
>>
>> We have some improvements for HT-PHY (BCM4331) in 3.18-rc1 (and
>> newer). Could you try it?
>>
>> b43 is still limited to 802.11g speeds, but I hope it will be better
>> than 3.18 Mb/s.
>>
>
> I got:
>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
>                                  Dload  Upload   Total   Spent    Left  Speed
> 100 2147M  100 2147M    0     0  2246k      0  0:16:18  0:16:18 --:--:-- 1842k
>
> real    16m18.774s
> user    0m27.340s
> sys     0m36.350s
>
> This is ~ 17.55Mbit/s for file transfer.
> What is much, much better. Thank you.
>
> Are these changes(3.16 [slow b43] vs 3.18 [fast b43]) located
> in drivers/net/wireless/b43?
> I would like to port them(changes) to my 3.16 kernel.

You may also look at drivers/ssb. Anyway, there is already a project
of backporting drivers, see:
https://backports.wiki.kernel.org/index.php/Main_Page


> By the way, during test connection was hang,
> and I can not ping any machine outside of my notebook.
>
> I rmmod/modprobe b43, restart wpa_supplicant/dhcpcd
> and all back to normal.
> And after restart I was unable to reproduce it(bug).
> dmesg also show nothing. Any hints how to debug such
> kind of issues, if I see it again?

I'm afraid not. You would need to hack driver to display info about
interrupts. Then see if there are any packets appearing or not, etc.

-- 
Rafa?