[Bugme-new] [Bug 13565] New: Bad performance of wifi using zd1211rw driver

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=13565

           Summary: Bad performance of wifi using zd1211rw driver
           Product: Networking
           Version: 2.5
    Kernel Version: 2.6.29 and 2.6.30
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Wireless
        AssignedTo: networking_wireless at kernel-bugs.osdl.org
        ReportedBy: raquacontact at gmail.com
        Regression: Yes


I have one machine, that has Arch Linux and Ubuntu installed.
I have Zyxel G-202 USB Wifi dongle, that uses zd1211rw driver included in
kernel.

In Arch, when I try to copy files from this machine to my other PC (wired
connection) I get upload 25-100 KB/s. In Ubuntu I get 1.5-2 MB/s.
When just browsing, everything is fine on Arch as well, but when I start
torrents or anything what really uses a lot of bandwidth, my pings to router go
up to 3000 ms, sometimes even 40 000 ms with occasional disconnects. This does
not happen on Ubuntu. Torrents work fine there.

Ubuntu has 2.6.28 kernel, my fully updated Arch is on 2.6.29. 

I checked logs on both systems, everything looks fine, no errors and zd1211rw
loading section in dmesg is the same :

Ubuntu:
[   25.184444] usb 1-3: firmware: requesting zd1211/zd1211b_ub
[   25.287503] usb 1-3: firmware: requesting zd1211/zd1211b_uphr
[   25.362855] zd1211rw 1-3:1.0: firmware version 4725
[   25.404846] zd1211rw 1-3:1.0: zd1211b chip 0586:3410 v4810 high 00-19-cb
AL2230_RF pa0 g--NS

Arch:
usb 1-3: firmware: requesting zd1211/zd1211b_ub
usb 1-3: firmware: requesting zd1211/zd1211b_uphr
zd1211rw 1-3:1.0: firmware version 4725
zd1211rw 1-3:1.0: zd1211b chip 0586:3410 v4810 high 00-19-cb AL2230_RF pa0
g--NS

I tried to switch my Arch installation to 2.6.30 kernel, but the problem
persisted. Then I downgraded kernel to 2.6.28 and this works just fine, so the
problem exists in 2.6.29 and 2.6.30 kernel. 

If you need any additional info, I'll be happy to provide.

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