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Throughput regression in b43 caused by spurious avoidance implementation

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Hi everyone,

as I have been plagued by the performance regression in b43 between linux 3.2 
and 3.3, I have bisected it:

git bisect good
49d55cef5b1925a5c1efb6aaddaa40fc7c693335 is the first bad commit
commit 49d55cef5b1925a5c1efb6aaddaa40fc7c693335
Author: Rafał Miłecki <zajec5@xxxxxxxxx>
Date:   Sun Dec 11 13:16:51 2011 +0100

    b43: N-PHY: implement spurious tone avoidance
    
    Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx>
    Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>

:040000 040000 f6177f4c33e1d382a430ad83db1e4b3f9dd66dfd 
1b161ac9a16a481f259606edda5039c2be5147f4 M      drivers

lspci -v{n,}:
08:00.0 0280: 14e4:432b (rev 01)
        Subsystem: 1028:000d
        Flags: bus master, fast devsel, latency 0, IRQ 17
        Memory at f0600000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [58] Vendor Specific Information: Len=78 <?>
        Capabilities: [e8] 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 7e-d8-e5-xx-xx-xx-xx
        Capabilities: [16c] Power Budgeting <?>
        Kernel driver in use: b43-pci-bridge

08:00.0 Network controller: Broadcom Corporation BCM4322 802.11a/b/g/n 
Wireless LAN Controller (rev 01)
        Subsystem: Dell Wireless 1510 Wireless-N WLAN Mini-Card

Used channel is channel 13, 2.472GHz, AP is AVM 7112, "G-only" mode.

Regards,

Stefan


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