PowerAP N wireless drop after 10 days

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Spaghetti
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Joined: 15 Jan 2011
Posts: 23

PostPosted: Wed Jul 20, 2011 0:53    Post subject: PowerAP N wireless drop after 10 days Reply with quote
Hi I have had an issue where the wireless completely drops off between 5 and 15 days of use. I am running DD-WRT v24-sp2 (01/24/11) std
(SVN revision 16060).

A month ago when it was down, I had some time and jumped on a directly connected PC, it was working through ethernet. I SSH'ed into the box and ran top. I think there was an httpd using around 40% CPU and something else using the rest (I forgot to copy the top output sorry).

Last time it happened twice while I was hosting a game server on PC. There was probably torrents going too if that helps.

What should I look for next time this happens?

BTW, you should update the Router Database to include a newer build as supported for the PowerAP N. The current one doesnt work correctly if you have flashed the newer AirOS firmwares because of a new bootloader.
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daniel1
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PostPosted: Wed Jul 20, 2011 6:22    Post subject: Reply with quote
Try update your router with ath9k

Search in ftp for router model with ath9k support

Search for my last thread to understand

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Spaghetti
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PostPosted: Sat Jul 23, 2011 0:52    Post subject: Reply with quote
I dont understand. Update with ath9k? Can you link to your thread? You have several going

If I should update the build, which build should I use?

The download page still lists an older incompatible firmware for my device.

It happened again just a few minutes ago. It looks like the memory might be low. Here is the dmesg output when I logged in via ethernet

Code:
<4>[351479.540000] ath_uapsd_processtriggers: no skbuff
<4>[351479.540000] wifi0: no skbuff (ath_rx_poll)
<4>[351479.550000] swapper: page allocation failure. order:1, mode:0x20
<4>[351479.550000] Call Trace:
<4>[351479.550000] [<800098f0>] dump_stack+0x8/0x34
<4>[351479.550000] [<80057e54>] __alloc_pages_nodemask+0x550/0x5c4
<4>[351479.550000] [<8007485c>] cache_alloc_refill+0x280/0x5bc
<4>[351479.550000] [<80074c3c>] __kmalloc+0xa4/0xfc
<4>[351479.550000] [<8018e6c0>] __alloc_skb+0x70/0x140
<4>[351479.550000] [<8018ef20>] dev_alloc_skb+0x1c/0x4c
<4>[351479.550000] [<80d049a8>] __ath_alloc_skb_align__+0x1c/0x60 [ath_mimo_pci]
<4>[351479.550000] [<80d04ae4>] ath_rxbuf_init+0xf8/0x260 [ath_mimo_pci]
<4>[351479.550000] [<80d0fdd0>] ath_rx_poll+0xee4/0x10f8 [ath_mimo_pci]
<4>[351479.550000] [<80d10064>] ath_tasklet+0x74/0x128 [ath_mimo_pci]
<4>[351479.550000] [<80024c90>] tasklet_action+0x74/0xd0
<4>[351479.550000] [<8002536c>] __do_softirq+0xa0/0x144
<4>[351479.550000] [<80025458>] do_softirq+0x48/0x6c
<4>[351479.550000] [<8000242c>] ret_from_irq+0x0/0x4
<4>[351479.550000] [<80002620>] r4k_wait+0x20/0x40
<4>[351479.550000] [<8000f110>] cpu_idle+0x24/0x44
<4>[351479.550000] [<802dea50>] start_kernel+0x324/0x33c
<4>[351479.550000]
<4>[351479.550000] Mem-Info:
<4>[351479.550000] Normal per-cpu:
<4>[351479.550000] CPU    0: hi:    0, btch:   1 usd:   0
<4>[351479.550000] active_anon:407 inactive_anon:0 isolated_anon:0
<4>[351479.550000]  active_file:839 inactive_file:1405 isolated_file:0
<4>[351479.550000]  unevictable:0 dirty:0 writeback:0 unstable:0
<4>[351479.550000]  free:68 slab_reclaimable:152 slab_unreclaimable:3947
<4>[351479.550000]  mapped:342 shmem:0 pagetables:59 bounce:0
<4>[351479.550000] Normal free:272kB min:720kB low:900kB high:1080kB active_anon:1628kB inactive_anon:0kB active_file:3356kB inactive_file:5620kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:32512kB mlocked:0kB dirty:0kB writeback:0kB mapped:1368kB shmem:0kB slab_reclaimable:608kB slab_unreclaimable:15788kB kernel_stack:248kB pagetables:236kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
<4>[351479.550000] lowmem_reserve[]: 0 0
<4>[351479.550000] Normal: 2*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 272kB
<4>[351479.550000] 2244 total pagecache pages
<4>[351479.550000] 8192 pages RAM
<4>[351479.550000] 880 pages reserved
<4>[351479.550000] 1718 pages shared
<4>[351479.550000] 4877 pages non-shared
<4>[351479.550000] DEBUG : SKB NULL
<4>[351479.760000] AG7240: outta skbs!
<4>[351479.760000] AG7240: outta skbs!
<snip>
<4>[351479.960000] ath_uapsd_processtriggers: no skbuff
<4>[351479.960000] wifi0: no skbuff (ath_rx_poll)
<4>[351479.960000] wifi0: no skbuff (ath_rx_poll)
<4>[351479.970000] wifi0: no skbuff (ath_rx_poll)
<4>[351479.970000] wifi0: no skbuff (ath_rx_poll)
<4>[351479.980000] DEBUG : SKB NULL
<snip>
<4>[351480.380000] DEBUG : SKB NULL
<4>[351480.380000] AG7240: outta skbs!
<4>[351480.390000] Resetting; Code: 01
<4>[351480.390000] DEBUG : SKB NULL
<4>[351480.390000] wifi0: ath_resetinternal: unable to start recv logic
<4>[351480.420000] AG7240: outta skbs!
<4>[351611.190000] AG7240: enet unit:1 phy:2 is up...Mii 100Mbps full duplex
<4>[351611.200000] AG7240: done cfg2 0x7215 ifctl 0x0 miictrl 
root@DD-WRT:~#
Sash
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Location: Hesse/Germany

PostPosted: Sat Jul 23, 2011 7:39    Post subject: Reply with quote
read:
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Spaghetti
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Joined: 15 Jan 2011
Posts: 23

PostPosted: Sat Aug 13, 2011 16:26    Post subject: Reply with quote
So I applied an updated firmware, and its still doing the same thing.

Running DD-WRT v24-sp2 (06/14/11) std (SVN revision 17201).

None of my wireless devices are connecting to the network, and there have been no P2P apps running on the network in the last 24 hours. The only thing that was going on when it stopped working was my roommate playing PS3 online.

I logged in via ethernet and there are a lot of these errors:


Code:
<4>[1238528.760000] wifi0: no skbuff (ath_rx_poll)


Then this:
Code:

<4>[1238530.050000] Resetting; Code: 01
<4>[1238530.050000] check_ps: page allocation failure. order:1, mode:0x20
<4>[1238530.050000] Call Trace:
<4>[1238530.050000] [<800095b8>] dump_stack+0x8/0x34
<4>[1238530.050000] [<8005574c>] __alloc_pages_nodemask+0x52c/0x598
<4>[1238530.050000] [<8007168c>] cache_alloc_refill+0x27c/0x588
<4>[1238530.050000] [<80071a38>] __kmalloc+0xa0/0xf8
<4>[1238530.050000] [<80184e68>] __alloc_skb+0x70/0x138
<4>[1238530.050000] [<8018569c>] dev_alloc_skb+0x1c/0x48
<4>[1238530.050000] [<80d8c19c>] __ath_alloc_skb_align__+0x18/0x2b0 [ath_mimo_pci]
<4>[1238530.050000] [<80d8c2b8>] __ath_alloc_skb_align__+0x134/0x2b0 [ath_mimo_pci]
<4>[1238530.050000]

<4>[1238530.050000] Mem-Info:
<4>[1238530.050000] Normal per-cpu:
<4>[1238530.050000] CPU    0: hi:    0, btch:   1 usd:   0
<4>[1238530.050000] active_anon:179 inactive_anon:263 isolated_anon:0
<4>[1238530.050000]  active_file:39 inactive_file:281 isolated_file:0
<4>[1238530.050000]  unevictable:64 dirty:0 writeback:0 unstable:0
<4>[1238530.050000]  free:430 slab_reclaimable:76 slab_unreclaimable:5449
<4>[1238530.050000]  mapped:56 shmem:0 pagetables:61 bounce:0
<4>[1238530.050000] Normal free:1720kB min:720kB low:900kB high:1080kB active_anon:716kB inactive_anon:1052kB active_file:156kB inactive_file:1124kB unevictable:256kB isolated(anon):0kB isolated(file):0kB present:32512kB mlocked:0kB dirty:0kB writeback:0kB mapped:224kB shmem:0kB slab_reclaimable:304kB slab_unreclaimable:21796kB kernel_stack:360kB pagetables:244kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
<4>[1238530.050000] lowmem_reserve[]: 0 0
<4>[1238530.050000] Normal: 396*4kB 1*8kB 0*16kB 0*32kB 0*64kB 1*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1720kB
<4>[1238530.050000] 387 total pagecache pages
<4>[1238530.050000] 8192 pages RAM
<4>[1238530.050000] 871 pages reserved
<4>[1238530.050000] 175 pages shared
<4>[1238530.050000] 4428 pages non-shared
<4>[1238530.050000] DEBUG : SKB NULL
<4>[1238530.050000] wifi0: ath_resetinternal: unable to start recv logic
<4>[1238533.110000] khelper invoked oom-killer: gfp_mask=0xd0, order=1, oom_adj=0
<4>[1238533.110000] Call Trace:
<4>[1238533.120000] [<800095b8>] dump_stack+0x8/0x34
<4>[1238533.120000] [<80051ca4>] dump_header.clone.12+0x48/0x120
<4>[1238533.130000] [<80051dc0>] oom_kill_process.clone.13+0x44/0x110
<4>[1238533.130000] [<800521bc>] __out_of_memory+0x178/0x1ac
<4>[1238533.140000] [<8005243c>] out_of_memory+0x88/0xb4
<4>[1238533.140000] [<80055688>] __alloc_pages_nodemask+0x468/0x598
<4>[1238533.150000] [<800557d0>] __get_free_pages+0x18/0x4c
<4>[1238533.150000] [<8001d3a0>] copy_process+0xc4/0xc94
<4>[1238533.160000] [<8001e100>] do_fork+0x178/0x2f4
<4>[1238533.160000] [<8000e834>] kernel_thread+0x74/0x8c
<4>[1238533.170000] [<8002f13c>] __call_usermodehelper+0x4c/0xa8
<4>[1238533.170000] [<8002fbb4>] worker_thread+0x108/0x1a4
<4>[1238533.180000] [<8003344c>] kthread+0x7c/0x88
<4>[1238533.180000] [<8000e50c>] kernel_thread_helper+0x10/0x18
<4>[1238533.190000]
Spaghetti
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Joined: 15 Jan 2011
Posts: 23

PostPosted: Mon Aug 15, 2011 4:33    Post subject: Reply with quote
Is this the place to get support? Not particularly happy paying $25 to beta test a product that freezes every few days on a device that was promised to be supported.
BrainSlayer
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Location: Dresden, Germany

PostPosted: Mon Aug 15, 2011 15:49    Post subject: Reply with quote
use the alternate ath9k builds. they are running much better without memory leakage problems we know
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Spaghetti
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Joined: 15 Jan 2011
Posts: 23

PostPosted: Sun Aug 21, 2011 1:01    Post subject: Reply with quote
There isn't an ath9k build for the PowerAP N.

I am looking here:
http://www.dd-wrt.com/site/support/other-downloads?path=others%2Feko%2FBrainSlayer-V24-preSP2%2F

The Loco, Nanostation, Bullet, Bullet, Pico etc all have a separate ath9k build, but not the AP N. Would the Bullet M2 ath9k build be equivalent?

Thanks
Sash
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PostPosted: Tue Aug 23, 2011 21:38    Post subject: Reply with quote
does the ap have a switch or a single ethernet port? if its a single port its doesnt matter what M build u will use
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Spaghetti
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PostPosted: Tue Aug 23, 2011 21:56    Post subject: Reply with quote
Yes the PowerAP N has a four port switch as well as the WAN port
Sash
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PostPosted: Thu Aug 25, 2011 12:26    Post subject: Reply with quote
as is see right now we dont have a ath9k build vor the PowerAP N right now.

see
http://svn.dd-wrt.com/ticket/2184

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Sash
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PostPosted: Thu Aug 25, 2011 21:16    Post subject: Reply with quote
i spoke to BS. you should use the bullet ath9k build
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hjacobson
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PostPosted: Mon Aug 29, 2011 4:19    Post subject: Reply with quote
Sash wrote:
i spoke to BS. you should use the bullet ath9k build

The Bullet devices are physically so different from the PowerAP N router. I had a bad feeling about using either of the two Bullet ath9k firmwares (ubnt_bullet_m2_hp_ath9k, ubnt_bullet_m5_hp_ath9k) from the eko/BrainSlayer-V24-preSP2/2011/06-14-11-r17201 folder.

However the Ubiquiti AirRouter is physically similar to the PowerAP N according to a tech at Ubiquiti. I downloaded the ath9k firmwares for the AirRouter and the two Bullets and did a binary comparison of the three; they're identical.

Just for peace of mind I'm going to use the AirRouter labeled firmware to update the PowerAP N. It makes ever so slightly more sense to me.
BUTRE
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Joined: 23 Sep 2011
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PostPosted: Fri Sep 23, 2011 10:42    Post subject: Reply with quote
hjacobson,

I also own a Power AP N and feel the need to get it "upgraded" since AirOS is a little limited even with CLI.

How went the testing using the AirRouter firmware?

I'm a little lost regarding what dd-wrt firmware should I go to start with since in Router Database it shows a bullet M2 firmware and on the Supported Devices it shows a firmware that I can not find (.v24 SP2 - build 16059)
hjacobson
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PostPosted: Fri Sep 23, 2011 14:46    Post subject: Reply with quote
BUTRE wrote:
hjacobson,

How went the testing using the AirRouter firmware?



I haven't yet changed from AirOS to DD-WRT on my PowerAP N due to time constraints.

Currently the PowerAP N is linked by wire to the Buffalo WHR-HP-G54 AP-router (running DD-WRT v24 SP2) on my wireless network. The PowerAP N is configured as a wireless-N only AP with its own unique SSID and channel. The WHR-HP-G54 doesn't do 802.11n; I'd love to replace it with the PowerAP N. That has to wait till I can make the PowerAP N do DHCP reservations with either its native AirOS or DD-WRT.

I'd love to play with the PowerAP N; unfortunately I just can't make the time.
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