#2140: Packet's don't go out under high load
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Reporter: [EMAIL PROTECTED] | Type: defect
Status: new | Priority: major
Component: madwifi: driver | Version: v0.9.3.2
Keywords: outgoing packets freeze | Patch_attached: 0
Pending: 0 |
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Hello,
I am using madwifi-0.9.3.2 in adhoc mode. Under high load (ie when there
is a lot of ongoing traffic), I experience the following problem:
Although tc -s qdisc dev show wifi0 shows that many KB's of packets are
backlogged, and my UDP socket queues are also full. I can't see any
outgoing packets. I verify this problem by
a) doing a tcpdump -i ath0 "ip src 100.0.0.X" on the offending node (whose
IP is 100.0.0.X), and on some neighboring node (that can hear X). I see
nothing going out.
This happens erratically, ie it may or may not happen all the time. This
makes it all the more perplexing. I have a twenty node testbed, and it
seems to happen randomly on any one of them.
And sometimes, this only happens if I am sending Non best effort packets
out. Like by doing ping -Q 0x08 (or even with the voice queue 0x30 etc).
But sometimes, this affects all outgoing packets, even best effort ones.
The problem disappears after a long time on its own, of the order of half
to a couple of hours.
Here is my relevant system info: (Ubuntu 7.10 on an intel mac mini)
lspci -vv:
02:00.0 Ethernet controller: Atheros Communications, Inc. Unknown device
001c (rev 01)
Subsystem: Apple Computer Inc. Unknown device 0086
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 256 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at 90100000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit-
Queue=0/0 Enable-
Address: 00000000 Data: 0000
Capabilities: [60] Express Legacy Endpoint IRQ 0
Device: Supported: MaxPayload 128 bytes, PhantFunc 0,
ExtTag-
Device: Latency L0s <512ns, L1 <64us
Device: AtnBtn- AtnInd- PwrInd-
Device: Errors: Correctable- Non-Fatal- Fatal-
Unsupported-
Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port
0
Link: Latency L0s <512ns, L1 <64us
Link: ASPM Disabled RCB 128 bytes CommClk+ ExtSynch-
Link: Speed 2.5Gb/s, Width x1
Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
Vector table: BAR=0 offset=00000000
PBA: BAR=0 offset=00000000
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
iwconfig:
ath0 IEEE 802.11b ESSID:"XYZ" Nickname:""
Mode:Ad-Hoc Frequency:2.437 GHz Cell: Not-Associated
Bit Rate=11 Mb/s Tx-Power=15 dBm Sensitivity=1/1
Retry:off RTS thr:off Fragment thr:off
Encryption key:XYZ Security mode:restricted
Power Management:off
Link Quality=16/70 Signal level=-80 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
Are you folks aware of this problem ?. Has it been rectified in 0.9.4
version ?. Or is it because I am doing something wrong. Thanks.
I would be grateful for your advise.
--
Ticket URL: <http://madwifi.org/ticket/2140>
madwifi.org <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
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