[SOLVED] Extremely Slow Wireless on Macbook Pro

SOLVED (Hopefully forever.)
Problem: The b43 and bcma kernel modules do not get along. You'd never know this with kernels up to 3.2.14, as bcma is not automatically loaded and it is not needed with b43. For recent kernels however, it is. It in turn destroys wireless internet speeds.
Solution: The broadcom-wl driver. It used to be portrayed in the Wiki as being something to avoid, but that has changed recently. It offers a better connection and much faster speeds, but can take a little bit more effort to set up. Just a bit.
Broadcom-wl Installation and Setup
1. Install broadcom-wl from the AUR.
2. Uninstall b43-firmware if it's installed.
3. Note what broadcom-wl has put into /etc/modprobe.d. These blacklistings will ensure no interference from other kernel modules. Also make sure you're not blacklisting `wl` or its friends, if you have been.
4. Don't reboot yet. Go to /sys/class/net and use the command:
udevadm info -a -p /sys/class/net/<yourdevice> | grep address | tr [A-Z] [a-z]
(of course replacing <yourdevice> with the names of your interfaces - probably eth0 and wlan0) This will tell you their MAC addresses. Write these down!
5. Go to /etc/udev/rules.d/ and create a file called 10-network.rules. We are going to make custom udev rules so that our interfaces are matched to their proper names at boot time. Here is a template:
SUBSYSTEM=="net", ATTR{address}=="aa:bb:cc:dd:ee:ff", NAME="net0"
SUBSYSTEM=="net", ATTR{address}=="ff:ee:dd:cc:bb:aa", NAME="wifi0"
Enter the MAC addresses (in lower case!) and give them names in the NAME field. Apparently it's a good idea to choose new interface names, different from the default eth0 and wlan0. My file looks like this:
SUBSYSTEM=="net", ATTR{address}=="58:b0:35:f6:45:0c", NAME="wired0"
SUBSYSTEM=="net", ATTR{address}=="f8:1e:df:ea:99:17", NAME="wifi0"
6. Go change ANYTHING that had references to the old interface names. I had to change my rc.conf, as well as settings in my wicd preferences so that it knows what names to look for.
7. Rebuild your kernel image with
sudo mkinitcpio -p linux
(you might not have to do this, but it couldn't hurt.)
8. Save this page. Yes, the html. This is so that you still know what to do in case of problems and no internet.
9. Reboot and enjoy your restored wireless internet.
---- ORIGINAL POST ----
Seems everybody and their grandmothers are having internet problems since 3.3.
On a Macbook Pro, kernel 3.3.2-1.
Here is my problem: http://i.imgur.com/AcqLM.jpg
I made that image before checking the forums, but now that I've looked around I suspect the kernel.
Put up with it until 3.3.3? Or regress?
Last edited by fosskers (2012-08-31 13:00:28)

@fosskers:
Sry, I just told KDE to disable it
@all:
/proc/net/wireless looks pretty bad:
Inter-| sta-| Quality | Discarded packets | Missed | WE
face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
wlan0: 0000 70. -38. -256 0 0 0 514 2 0
After measuring this, I just got kicked out (again):
[ 1072.839997] ieee80211 phy0: wlan0: No probe response from AP 4c:e6:76:22:4f:33 after 500ms, disconnecting.
Now it even refuses to reconnect. This is a full "enable wireless - try connect - fail"-cycle:
[ 1698.359901] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[ 1698.560136] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1721.394168] wlan0: authenticate with 4c:e6:76:22:4f:33
[ 1721.420074] wlan0: send auth to 4c:e6:76:22:4f:33 (try 1/3)
[ 1721.422002] wlan0: authenticated
[ 1721.423411] wlan0: associate with 4c:e6:76:22:4f:33 (try 1/3)
[ 1721.426883] wlan0: RX AssocResp from 4c:e6:76:22:4f:33 (capab=0x411 status=0 aid=1)
[ 1721.426886] wlan0: associated
[ 1721.428216] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1729.470178] wlan0: deauthenticated from 4c:e6:76:22:4f:33 (Reason: 2)
[ 1729.473907] cfg80211: Calling CRDA to update world regulatory domain [...]
[ 1730.674444] wlan0: authenticate with 4c:e6:76:22:4f:33
[ 1730.700199] wlan0: send auth to 4c:e6:76:22:4f:33 (try 1/3)
[ 1730.702446] wlan0: authenticated
[ 1730.703423] wlan0: associate with 4c:e6:76:22:4f:33 (try 1/3)
[ 1730.706988] wlan0: RX AssocResp from 4c:e6:76:22:4f:33 (capab=0x411 status=0 aid=1)
[ 1730.706997] wlan0: associated
[ 1738.740963] wlan0: deauthenticated from 4c:e6:76:22:4f:33 (Reason: 2)
[ 1738.748937] cfg80211: Calling CRDA to update world regulatory domain [...]
[ 1739.954181] wlan0: authenticate with 4c:e6:76:22:4f:33
[ 1739.980222] wlan0: send auth to 4c:e6:76:22:4f:33 (try 1/3)
[ 1739.982773] wlan0: authenticated
[ 1739.983401] wlan0: associate with 4c:e6:76:22:4f:33 (try 1/3)
[ 1739.987077] wlan0: RX AssocResp from 4c:e6:76:22:4f:33 (capab=0x411 status=0 aid=1)
[ 1739.987086] wlan0: associated
[ 1746.001760] wlan0: deauthenticating from 4c:e6:76:22:4f:33 by local choice (reason=3)
[ 1746.015596] cfg80211: Calling CRDA to update world regulatory domain [...]
Sometimes it does not find any networks at all (iwlist wlan0 scan shows nothing)
Again, everything was fine with kernel < 3.4. (downgrading helps).
Maybe I should start compiling some kernels myself and search the regression with a bisection...

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