Bug 13958
| Summary: | ath5k Atheros AR5001 low signal | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Marco Siviero (darker1985) |
| Component: | network-wireless | Assignee: | drivers_network-wireless (drivers_network-wireless) |
| Status: | CLOSED INVALID | ||
| Severity: | normal | CC: | cagnulein, linville, me, mickflemm, rjw, zajec5 |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.30-rc1+ | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 13070 | ||
| Attachments: |
lspci -vv from 2.6.31-rc6 kernel
config for 2.6.29 kernel iwconfig from 2.6.29 kernel lsmod from 2.6.29 kernel lspci from 2.6.29 kernel iwconfig from 2.6.31-ARCH kernel iperf test results for 2.6.31* kernel iperf test results for 2.6.29 kernel |
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Created attachment 22717 [details]
lspci -vv from 2.6.31-rc6 kernel
On Thursday 20 August 2009, Marco Siviero wrote:
> Rafael J. Wysocki ha scritto:
> >
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.29 and 2.6.30. Please verify if it still should
> > be listed and let me know (either way).
> Hello!
> In 2.6.30.5 the regression is still alive. I'm waiting for the
> 2.6.31-rc6 to test if this regression is gone away.
this bug is still a problem with 2.6.31-rc9 and previous release candidates kernels. the last working kernel is the 2.6.29.* series. Bye Marco As this is regression, very helpful would be finding commit that broke that. Could you bisect this, please? I also found similar report on ath5k-devel: https://lists.ath5k.org/pipermail/ath5k-devel/2009-August/002590.html however it doesn't have to be the same problem of course. Just some track I wanted to mention. Ok wait, are you using madwifi in 2.6.29 or ath5k?
And when you say "no signal at all" -- are you by chance using IBSS (ad-hoc) mode? Because this shows a 50% signal level:
> Link Quality=42/70 Signal level=-68 dBm Noise level=-104 dBm
Hello Bob!
When i say "no signal at all" i mean "no signal at all".
Where with 2.6.29 kernel i have a strong signal, near 40%, with newer kernels i have no signal at all.
Where with newer kernels i have for example 60% signal, with 2.6.29 kernels i have 90-100% signal, like this:
Same place:
2.6.29 IWCONFIG
wlan0 IEEE 802.11bg ESSID:"Alice-04493438"
Mode:Managed Frequency:2.412 GHz Access Point: 00:1D:8B:43:29:15
Bit Rate=11 Mb/s Tx-Power=5 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:on
Link Quality=100/100 Signal level:-66 dBm Noise level=-104 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
2.6.31 IWCONFIG
wlan0 IEEE 802.11bg ESSID:"Alice-04493438"
Mode:Managed Frequency:2.412 GHz Access Point: 00:1D:8B:43:29:15
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=44/70 Signal level=-66 dBm Noise level=-105 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
As you can see my network mode is managed, as i connect to my router.
I attach some files thath could help debugging.
Thanks for the support
Marco
Uh, i use in both 2.6.29 and in newer kernels ath5k driver! NO madwifi! Created attachment 23526 [details]
config for 2.6.29 kernel
Created attachment 23527 [details]
iwconfig from 2.6.29 kernel
Created attachment 23528 [details]
lsmod from 2.6.29 kernel
Created attachment 23529 [details]
lspci from 2.6.29 kernel
Created attachment 23530 [details]
iwconfig from 2.6.31-ARCH kernel
Ok, can you run some tests with iperf to see what actual throughput is? We may have changed the link quality calculation at some point to be more accurate. e.g. in 2.6.31 it shows you using 18 mbps instantaneous rate whereas in 2.6.29 you are using 11. The actual signal values reported by the card are about the same despite the 'link quality' discrepancy. Hello Bob! I attach the results of iperf tests; note that my iperf server machine is linked to a router that doesn't support speed above 10mbps for wired connections. Created attachment 23593 [details]
iperf test results for 2.6.31* kernel
Created attachment 23594 [details]
iperf test results for 2.6.29 kernel
Bob, is Marco's information useful? Nick, could we be incorrectly calculating the signal strength? Yes -- the posted information shows very little difference in actual throughput between 2.6.29 and 2.6.31. What it does show is: - in 29 it always reported 100/100 (despite only getting nominal 18 mbps) - in 31 it shows 43/70, for -67 dBm signal. .31 seems more correct to me. Also some user space programs didn't deal well with the change to /70 fractions, maybe that is at play here? .31 seems O.K. to mee too, you can't have 100/100 with -66dBm. We calculate rssi corectly, i've verified it with a spectrum analyzer some time ago (and we haven't changed the way we read it from the card since). -105 noise floor seems weird though and -66 is usually good enough to have >= 36Mb rate, maybe Bruno's patches for I/Q calibration can fix that (or maybe it's just the card's sensitivity). Rafael, comment 18 and comment 19 seem to indicate that this isn't actually a bug (and therefor not a regression). Can we close this on that basis? Yes, we can. Closing. |
Hello! With 2.6.30-rc1 and above kernels my wireless card is no more recognized as AR242x and signal is lower: where it was near 100% now is only 60%. For example: 2.6.29 kernel iwconfig: wlan0 IEEE 802.11bg ESSID:"Alice-04493438" Mode:Managed Frequency:2.412 GHz Access Point: 00:1D:8B:43:29:15 Bit Rate=11 Mb/s Tx-Power=5 dBm Retry min limit:7 RTS thr:off Fragment thr=2352 B Power Management:on Link Quality=100/100 Signal level:-65 dBm Noise level=-105 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 2.6.31-rc5 kernel iwconfig: wlan0 IEEE 802.11bg ESSID:"Alice-04493438" Mode:Managed Frequency:2.412 GHz Access Point: 00:1D:8B:43:29:15 Bit Rate=11 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=42/70 Signal level=-68 dBm Noise level=-104 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Also, where before there was a stable signal of about 40% now there is no signal at all. Last fully working kernel was 2.6.29* series. Bye Marco