[rt2x00-users] Slow performance with rt2800pci / RT3090
Dennis Martin Herbers
dennis.martin.herbers at googlemail.com
Sun Jun 19 06:16:47 EST 2011
sorry for the multiple mails... I am not 100% sure it has something to do
with power management now. It doesn't matter if I am connected to AC or not,
when I reconned to the wireless network 2-3 times it's suddenly fullspeed
again but not for a long time. Sometimes it's slow from the beginning,
sometimes it's fullspeed for 10 seconds, sometimes it's fullspeed for 2
minutes. That is really weird and I don't know what to do about it :(
2011/6/18 Dennis Martin Herbers <dennis.martin.herbers at googlemail.com>
> well, power management is definitly the issue. Toggling power management on
> and off didn't help, and plugging to the AC at runtime also didn't help.
> Then I tried booting with the AC plugged in (I usually plug it in at some
> point after the system is already running) and guess what: full speed! I
> then plugged off the AC and speed went down, plugged in again and nothing
> happened (even though iwconfig wlan0 always switches power on/off reliably
> when I plug it on and off the AC). Then I rebooted again with AC plugged in
> and for some weird reason, it's slow again? So it was luck or something.
> Definitly it has something to do with the power management not working as it
> should, any other way I can influence this or turn it off completely?
> 2011/6/18 Dennis Martin Herbers <dennis.martin.herbers at googlemail.com>
>> Thanks for your ongoing help.
>> "iw" doesn't know the "get power_save" command, but I was able to use
>> iwconfig for that. "iwconfig wlan0" reports that power management was on,
>> and so I disabled it with "sudo iwconfig wlan0 power off" and "iwconfig
>> wlan0" reported that it was indeed now turned off. But unfortunately, it
>> didn't improve the performance at all (no chances). Really weird :(
>> 2011/6/18 Helmut Schaa <helmut.schaa at googlemail.com>
>>> Am Samstag, 18. Juni 2011 schrieb Dennis Martin Herbers:
>>> > Okay, just did some testing with iperf (iperf -c <server_IP> -i 1 -t
>>> > This is what I get when the notebook is the client (notebook ->
>>> > http://pastebin.com/yYpTS3F0
>>> Doesn't look too bad that way.
>>> > This is what I get when the desktop is the client (desktop > notebook):
>>> > http://pastebin.com/XDdS5qzc
>>> > So it seems desktop -> notebook is MUCH slower and has serious
>>> Yep, please check if powersave is activated:
>>> iw dev wlan0 get power_save
>>> If it is on try if disabling helps:
>>> iw wlan0 set power_save off
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