Re: linux 3.2-rcX iwlwifi driver's problem (wifi link unstable when moving between multiple APs)

[Cheng Renquan <crquan@gmail.com>]

On Tue, Jan 10, 2012 at 2:27 PM, Guy, Wey-Yi <wey-yi.w.guy@intel.com> wrote:
> Hi Cheng,
>
> On Tue, 2012-01-10 at 15:17 -0800, Cheng Renquan wrote:
>> I've upgraded to Linux 3.2 and roaming failed randomly again,
>>
>> after the failure it may recover
>> sometimes by switch off and on the wifi button on laptop,
>> sometimes by "modprobe -r iwlwifi && modprobe iwlwifi",
>> sometimes by "stop networkmanager and start networkmanager",
>> sometimes recover automatically 10 or 20 minutes later,
>> sometimes never recover, infinitely looping (can only move to other
>> place, but same place has good wifi coverage verified by other
>> colleagues, win/mac users)
>>
>>
>> have checked it has your recent 78feb35 & 81670a4 commits,
>> $ git log -n5 --no-merges --oneline v3.2 -- drivers/net/wireless/iwlwifi/
>> 96f1f05 iwlwifi: update SCD BC table for all SCD queues
>> 78feb35 iwlwifi: allow to switch to HT40 if not associated
>> 81670a4 iwlwifi: tx_sync only on PAN context
>> 123877b iwlwifi: do not set the sequence control bit is not needed
>> 9995ffe iwlwifi: change the default behavior of watchdog timer
>>
> Are you saying without those two commits (78feb35 & 81670a4), the
> roaming works?

No, the v3.2-rc6 which doesn't include (78feb35 & 81670a4) also has no
roaming working,

The week before Xmas I tested v3.2-rc7 which include your (78feb35 &
81670a4) really has
roaming working, roamed to new AP stable in 1 minute in most meeting
rooms of the office,

Now this week 3.2 came out, since it has on changes under
"drivers/net/wireless/iwlwifi/",
I think it should be same with 3.2-rc7; but roaming not good again,
and may go off even not moving, staying same place;


[archuser@archtop linux-git]$ git log --no-merges -n5 --oneline
v3.2-rc6 -- drivers/net/wireless/iwlwifi/
9995ffe iwlwifi: change the default behavior of watchdog timer
34a5b4b iwlwifi: do not re-configure HT40 after associated
274b89c iwlagn: fix HW crypto for TX-only keys
43e5885 iwlwifi: avoid a panic when unloading the module with RF Kill
f956c34 iwlwifi: don't perform "echo test" when cmd queue stuck

[archuser@archtop linux-git]$ git log --no-merges -n5 --oneline
v3.2-rc7 -- drivers/net/wireless/iwlwifi/
96f1f05 iwlwifi: update SCD BC table for all SCD queues
78feb35 iwlwifi: allow to switch to HT40 if not associated
81670a4 iwlwifi: tx_sync only on PAN context
123877b iwlwifi: do not set the sequence control bit is not needed
9995ffe iwlwifi: change the default behavior of watchdog timer


The difference with that week before Xmas I think may be now the
office has more people
since everyone has come back from holidays;

In a 1hour meeting on Monday (yesterday) with 10+ people in a meeting room,
every other user (win&mac) are online except me: trying get iwlwifi working,
throughout all 60 minutes my iwlwifi get roaming looping cannot
recover (tried all above methods)
and when the meeting finished, other ones left, my iwlwifi started
working; recovered in 60 minutes; how sad