low throughputs with 14e4:4353

francesco.gringoli at ing.unibs.it francesco.gringoli at ing.unibs.it
Tue Nov 29 14:28:54 EST 2011

Hi Rafal,

I bought some 43224 cards to begin playing with the firmware. Unfortunately I have problems with the throughput that is really low. Kernel is the latest from wireless git and firmware comes from broadcom-wl-5.100.138. I see that the transmitted power is low, I monitored it with a spectrum analyzer and it confirmed. A lot of packets are lost given the low power and minstrel always select 1Mb/s. When receiving with the 43224 in monitor mode, I see that it receives only a few of the frames that are received by a close 4318-based box: the reported power levels are low too. Please find attached all info about kernel/firmware and devices below.

I tried all the four cards I have and they behave the same: find a photo of one of them here


I tried the cards on a MacBook White, on an Intel Atom based motherboard, Intel Pentium, and AMD Sempron, and I always got very low throughput. The same cards, with the same antennas (everything untouched) but with brcmsmac work well and the spectrum analyzer reports "normal" emitted power levels.


Linux version 3.2.0-rc2-wl+ (unibs at costanza.ing.unibs.it) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-13)) #4 SMP Mon Nov 28 19:29:00 CET 2011

[    9.892975] b43-phy0: Broadcom 43224 WLAN found (core revision 23)
[    9.893403] b43-phy0 debug: Found PHY: Analog 8, Type 4, Revision 6
[    9.893415] b43-phy0 debug: Found Radio: Manuf 0x17F, Version 0x2056, Revision 11
[  109.516058] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[  109.568056] b43-phy0 debug: Chip initialized
[  109.568208] b43-phy0 debug: 64-bit DMA initialized
[  109.568272] b43-phy0 debug: QoS enabled
[  109.568765] b43-phy0 debug: Wireless interface started
[  109.569035] b43-phy0 debug: Adding Interface type 2

02:00.0 0280: 14e4:4353 (rev 01)
	Subsystem: 103c:1509
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 256 bytes
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory at d0100000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: bcma-pci-bridge
	Kernel modules: bcma

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