Hi,
For the OpenELEC project I am looking into getting better performance out
of the b43 driver on the AppleTV (1st gen) device . The website reports
the driver can do 802.11n (albeit on 2.4Ghz only), however using kernel
3.7.5 (and earlier) I cannot get more than 3 MB/sec out of it (usually
much less).
Here's the information of the device from the PCI bus:
----
02:00.0 Network controller: Broadcom Corporation BCM4321 802.11a/b/g/n (rev 05)
Subsystem: Apple Inc. Device 008c
Physical Slot: 1
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at 22100000 (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 4a-7a-12-ff-ff-27-00-23
Capabilities: [16c] Power Budgeting <?>
Kernel driver in use: b43-pci-bridge
Kernel modules: wl
----
And the output of iwconfig:
----
wlan0 IEEE 802.11bg ESSID:"zelfbestuur"
Mode:Managed Frequency:2.462 GHz Access Point: 74:44:01:8D:90:5E
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=63/70 Signal level=-47 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:33 Invalid misc:1987 Missed beacon:0
----
The device's bit rate never exceeds 54 MB/s while other wireless devices
have iwconfig report e.g. IEEE 802.11abgn on the same netwerk:
----
wlan0 IEEE 802.11abgn ESSID:"zelfbestuur"
Mode:Managed Frequency:2.462 GHz Access Point: 74:44:01:8D:90:5E
Bit Rate=130 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=55/70 Signal level=-55 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:4867638 Invalid misc:22386 Missed beacon:0
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 (rev 34)
Subsystem: Intel Corporation Centrino Advanced-N 6205 AGN
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at f1400000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [c8] Power Management version 3
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [e0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 8c-70-5a-ff-ff-c3-f2-64
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
----
Is there anything I can do to troubleshoot ? Are there any module
parameters that could help ?
I have to mention that the device's interrupt is shared with the nvidia
driver.
----
16: 6374726 IO-APIC-fasteoi b43, nvidia
----
And that the kernel has been compiled using:
----
CONFIG_B43=m
CONFIG_B43_SSB=y
CONFIG_B43_PCI_AUTOSELECT=y
CONFIG_B43_PCICORE_AUTOSELECT=y
CONFIG_B43_PIO=y
CONFIG_B43_PHY_N=y
CONFIG_B43_PHY_LP=y
CONFIG_B43_PHY_HT=y
CONFIG_B43_LEDS=y
CONFIG_B43_DEBUG=y
----
If the above can be trimmed down for this type of device I'd like to hear
that as well (e.g. I am not sure if we need PIO or LEDS in this case).
PS I am also interested in any power management capabilities the
device has and that we could enable when the device is idle, since the
system lacks proper power management capabilities by itself
(suspend/hibernate) and seems to have a limited ACPI implementation.
Thanks in advance for any insights,
--
-- dag wieers, dag@xxxxxxxxxx, http://dag.wieers.com/
-- dagit linux solutions, info@xxxxxxxxx, http://dagit.net/
[Any errors in spelling, tact or fact are transmission errors]
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