soundcard and hostap wierdness

Duncan Robertson duncan
Tue Oct 22 19:54:50 PDT 2002


I am a new member of this list, and firstly would like to say thanks for
the excellent drivers, using them with two machines (AP server and client,
plus two laptops with orinoco cards with excellent results).

I am using the current CVS hostap drivers with 2.4.19 (debian, AMD K6) and
a dlink dwl 520. All works VERY well, except when I play mp3s (using
mpg321 or some other player) the network response basicly dies, though
starts up again perfectly as soon as I kill the mp3 playback. The sound
cards and dwl-520 are all on seperate interrupts etc. The machine is used
with X11, (and ethernet until the wireless proved reliable enough to
remove it) all the time no problems, it is only audio playback that
temporarily kills wireless. Any ideas on this? There are two soundcards in
the box but I have been only testing one at a time so far. I have tried
few different downloads of the hostap drivers and moved the cards around
in various slots on the board, PCI BIOS settings etc with no change in

For example running a ping whilst playing an mp3 gives:

64 bytes from icmp_seq=27 ttl=64 time=4.5 ms
64 bytes from icmp_seq=28 ttl=64 time=5.2 ms
wrong data byte #48 should be 0x30 but was 0x32
        14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29
2a 2b 2c 2d 2e 2f 32 33 32 33 
        34 35 36 37 0 0 0 0 98 d5 5 8 ff ff ff ff 
64 bytes from icmp_seq=30 ttl=64 time=5.1 ms
64 bytes from icmp_seq=31 ttl=64 time=7.1 ms
64 bytes from icmp_seq=32 ttl=64 time=5.0 ms

Modules loaded:

Module                  Size  Used by    Not tainted
sr_mod                 11512   0 (autoclean)
sg                     24100   0 (autoclean)
ipsec                 241312   2
ide-scsi                7456   0
scsi_mod               80168   3 [sr_mod sg ide-scsi]
hostap_pci             38316   1
hostap_crypt_wep        3040   1
hostap                 49092   0 [hostap_pci]
hostap_crypt            1412   0 [hostap_crypt_wep hostap]
es1371                 25856   1
ac97_codec              9536   0 [es1371]
unix                   13380 172 (autoclean)


  0:     292726          XT-PIC  timer
  1:      13020          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  4:      34997          XT-PIC  serial
 10:          0          XT-PIC  es1371
 11:      66069          XT-PIC  wlan0
 12:      35064          XT-PIC  es1371
 14:      18433          XT-PIC  ide0
 15:        742          XT-PIC  ide1

wlan0     IEEE 802.11-b  ESSID:"church1"  
          Mode:Managed  Frequency:2.422GHz  Access Point:
          Bit Rate:11Mb/s   Tx-Power:6 dBm   Sensitivity=1/3  
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality:46/92  Signal level:-73 dBm  Noise level:-100 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:242   Missed beacon:0


Duncan Robertson
Chief Technician - Minihub Communications ph (+61)412117159

"We may say most aptly that the Analytical Engine weaves algebraic
patterns just as the Jacquard loom weaves flowers and leaves"
                                   Countess Ada of Lovelace 

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