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SubjectRe: rt61pci - bad performance
(cc's added)

On Sun, 08 Aug 2010 11:49:49 +0200
Andreas <andihartmann@01019freenet.de> wrote:

> Hello!
>
> I've got the following hardware
>
>
> 01:05.0 Network controller: RaLink RT2561/RT61 rev B 802.11g
> Subsystem: Micro-Star International Co., Ltd. Device b833
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
> ParErr- Stepping- SERR- FastB2B- DisINTx-
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 128, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 21
> Region 0: Memory at cc000000 (32-bit, non-prefetchable) [size=32K]
> Capabilities: [40] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
> Kernel driver in use: ndiswrapper
>
>
> running on a 32bit notebook with kernel 2.6.34-12-desktop (OpenSuSE
> 11.3). There is no difference between the compat-wireless-modules
> 2010-07-20 and the original modules shipped with the openSuSE 11.3 kernel.
>
> If the rt61-chip is connected to a AP using rt61pci, the best
> throughput, which can be achieved (at the same place), is about 1,7
> MBytes/s.
>
> kernel: [ 656.112190] cfg80211: Calling CRDA to update world regulatory
> domain
> kernel: [ 656.112267] cfg80211: Calling CRDA for country: DE
> kernel: [ 656.169518] cfg80211: Regulatory domain changed to country: DE
> kernel: [ 656.169524] (start_freq - end_freq @ bandwidth),
> (max_antenna_gain, max_eirp)
> kernel: [ 656.169528] (2400000 KHz - 2483500 KHz @ 40000 KHz),
> (N/A, 2000 mBm)
> kernel: [ 656.169532] (5150000 KHz - 5350000 KHz @ 40000 KHz),
> (N/A, 2000 mBm)
> kernel: [ 656.169535] (5470000 KHz - 5725000 KHz @ 40000 KHz),
> (N/A, 2698 mBm)
> kernel: [ 656.206228] rt61pci 0000:01:05.0: PCI INT A -> GSI 21 (level,
> low) -> IRQ 21
> kernel: [ 656.219941] phy0: Selected rate control algorithm 'minstrel'
> kernel: [ 656.222216] Registered led device: rt61pci-phy0::radio
> kernel: [ 656.222658] Registered led device: rt61pci-phy0::assoc
> kernel: notebook1 ifup: wlan0 device: RaLink RT2561/RT61 rev B
> 802.11g
>
>
>
> wlan0 IEEE 802.11bg ESSID:"--------"
> Mode:Managed Frequency:2.412 GHz Access Point: some AP
> Bit Rate=1 Mb/s Tx-Power=5 dBm
> Retry long limit:7 RTS thr:off Fragment thr:off
> Encryption key:off
> Power Management:off
> Link Quality=38/70 Signal level=-72 dBm
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:0
>
> The throughput is measured with ping -f -s 7000 and xosview -n.
>
>
>
>
> If I'm using ndiswrapper with the windows driver, first of all, I can
> see additional information in iwconfig:
>
> wlan0 IEEE 802.11g ESSID:"--------"
> Mode:Managed Frequency:2.412 GHz Access Point: some AP
> Bit Rate=54 Mb/s Tx-Power:20 dBm Sensitivity=-121 dBm
> RTS thr=2347 B Fragment thr=2346 B
> Encryption key:some key Security mode:restricted
> Power Management:off
> Link Quality:62/100 Signal level:-56 dBm Noise level:-96 dBm
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:0 Missed beacon:0
>
>
> There is a switch for sensitivity (which is not supported with rt61pci)
> and the link quality compared with ndiswrapper is worse (38% to 62%).
>
> The following is remarkably too:
> ndiswrapper uses a Tx-Power of 20 dBm, rt61pci only 5 dBm. I don't know,
> why rt61pci uses 5 dBm. It's a hard limit and I can't set it on a value
> higher than 5 unless the driver is patched. Nevertheless, setting a
> higher value (of 20 dBm) by patch does not mean to get a better performance.
> Ndiswrapper shows an encryption key, rt61pci not. Does it mean, that
> rt61pci doesn't use hardware encryption?
>
>
> With ndiswrapper, the rt61pci-chip achieves a throughput of 2,6 MBytes/s
> - that's about 1 MByte/s more than rt61pci.
>
> I have to say, that the difference between rt61pci and ndiswrapper gets
> worse if the link quality is getting more badly. Or in other words:
> ndiswrapper handles bad connections better then rt61pci.
>
>
> Do you have any idea to get rt61pci working as fast as ndiswrapper?
>



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