Re: dire state of rtl8192se driver in 3.7

From: Larry Finger
Date: Sat Dec 22 2012 - 20:49:05 EST

On 12/22/2012 04:55 PM, Norbert Preining wrote:
Hi Larry,, hi all

On Sa, 22 Dez 2012, Larry Finger wrote:
It is not that no one cares; however, your attitude does nothing to
induce me to work on this problem. The facts are not needed "to make

Aehm, ... after my initial report you asked me several more questions,
which I answered within a few hours. After that no as in 0 response,
although I pinged back a few times.

So am I supposed to deduce from 0 reactions that anyone is interested?

people happy", they are necessary to try to reproduce the problem. If I
cannot make it happen here, then I cannot fix it. Also, remember that I

Disagree. I am involved in tracking down a nasty regression in the intel
drm driver, which the intel people can *not* reproduce, but several
other people, and after long trials and patches and converse it is
starting to look much better.

am a volunteer. I get nothing from Realtek but starting code of varying
quality and some sample chips. At least my versions do not crash your

Ok, that is a problem I understand. If this is the case, that it is
a single volunteer caring for the code, then I see a real problem.
(And I also will try to stay away from rtl wlan cards on my next laptop)

I have never tested forcing a reset on the chip the way you did. I am not
surprised that bad things happen.

But the DMAR item I also reported points to a real problem I guess.

Yes, I would agree.

From some of the material that you report, it appears that you have an
802.11n connection using WPA1 encryption. (More of those pesky details!)

WPA PSK, yes. I don't know the difference between WPA2 and WPA, though.

WPA2 is AES and WPA(1) is TKIP.

My device is the same as yours. The command 'lspci -nn' shows:

0e:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller [10ec:8172] (rev 10)

The B variety is a 1x2 configuration.

My signal strength is essentially the same as yours.

wlan0 IEEE 802.11bgn ESSID:"lwfdjf-n"
Mode:Managed Frequency:2.422 GHz Access Point: C0:3F:0E:BE:2B:44
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-35 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:1943 Missed beacon:0

A throughput test with netperf shows the following for 3 second samples:

TCP_MAERTS Test: 23.73 20.80 20.87 20.62 20.50 20.62 20.19 20.67 20.70 20.75
RX Results: max 23.73, min 20.19. Mean 20.95(0.95)

TCP_STREAM Test: 20.82 26.36 25.77 25.89 26.36 26.31 26.19 26.50 26.16 25.93
TX Results: max 26.50, min 20.82. Mean 25.63(1.62)

My router does not let me change the TKIP interval, which I think means 3600 seconds. Running a ping for ~4000 seconds results in

--- ping statistics ---
4004 packets transmitted, 4002 received, 0% packet loss, time 4007793ms
rtt min/avg/max/mdev = 0.782/1.605/77.929/4.310 ms

Only 2 packets lost in 4000 is pretty good, and my longest return time of 77 ms is certainly not like you get.

My router is a Netgear WNDR3300 running firmware version V1.0.45_1.0.45NA.

These results are representative of what I have always gotten. I have no idea why your system is so different.

One thing to try is loading the module with option "ips=0".


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