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Author Topic: Archlinux and wifi  (Read 5432 times)

iafo1

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Archlinux and wifi
« on: November 12, 2015, 08:54:03 PM »
Lately I have a lot of problems with the wifi connection (RTL8188).

I installed the arch-linux image downloaded from their website and for few months my imx233-mini-wifi was working but disconnecting every few days. I thought it was due to a bad signal but...

lately I upgraded archlinux and the wifi is not working at all.
I tried a different board (imx233-maxi) with the usb-rtl8188 but the result is the same.

Did any of you experimented the same issues?

iafo1

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Re: Archlinux and wifi
« Reply #1 on: November 13, 2015, 11:12:15 AM »
I tried to upgrade archlinux and to use connman instead of netctl. It seems to work....I'll let you know

iafo1

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Re: Archlinux and wifi
« Reply #2 on: November 17, 2015, 12:22:44 PM »
Ok! I am officially desperate!
With connman the wifi works nicely but after a while the board stop working at all!
I tried using only wpa_supplicant and actually it is seem that is the problem.


How come none of you have the same issue?
If you need more detail ask please.

Thank you!

iafo1

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Re: Archlinux and wifi
« Reply #3 on: November 18, 2015, 11:49:16 AM »
Using the UART debug cable I found that the board after a while starts showing continuosly the following error messages:

Code: [Select]
[166508.110000] [<c000f780>] (unwind_backtrace) from [<c000d20c>] (show_stack+0x10/0x14)
[166508.110000] [<c000d20c>] (show_stack) from [<c009bf44>] (warn_alloc_failed+0xdc/0x124)
[166508.110000] [<c009bf44>] (warn_alloc_failed) from [<c009e194>] (__alloc_pages_nodemask+0x178/0x860)
[166508.110000] [<c009e194>] (__alloc_pages_nodemask) from [<c009ea7c>] (__alloc_page_frag+0x160/0x194)
[166508.110000] [<c009ea7c>] (__alloc_page_frag) from [<c051aa84>] (__netdev_alloc_skb+0x84/0xec)
[166508.110000] [<c051aa84>] (__netdev_alloc_skb) from [<bf168574>] (_rtl_rx_completed+0xac/0x1bc [rtl_usb])
[166508.110000] [<bf168574>] (_rtl_rx_completed [rtl_usb]) from [<c03f08c8>] (__usb_hcd_giveback_urb+0x70/0x108)
[166508.110000] [<c03f08c8>] (__usb_hcd_giveback_urb) from [<c03f09e8>] (usb_giveback_urb_bh+0x88/0xcc)
[166508.110000] [<c03f09e8>] (usb_giveback_urb_bh) from [<c00216bc>] (tasklet_action+0x74/0xd8)
[166508.110000] [<c00216bc>] (tasklet_action) from [<c002196c>] (__do_softirq+0xe0/0x244)
[166508.110000] [<c002196c>] (__do_softirq) from [<c0021d6c>] (irq_exit+0xc4/0x10c)
[166508.110000] [<c0021d6c>] (irq_exit) from [<c00514b8>] (__handle_domain_irq+0x50/0xa8)
[166508.110000] [<c00514b8>] (__handle_domain_irq) from [<c000dcf0>] (__irq_svc+0x50/0x64)
[166508.110000] [<c000dcf0>] (__irq_svc) from [<c02b7d0c>] (__loop_delay+0x4/0x10)
[166508.110000] Mem-Info:
[166508.110000] active_anon:424 inactive_anon:20 isolated_anon:0
[166508.110000]  active_file:14 inactive_file:41 isolated_file:0
[166508.110000]  unevictable:0 dirty:0 writeback:0 unstable:0
[166508.110000]  slab_reclaimable:248 slab_unreclaimable:1864
[166508.110000]  mapped:4 shmem:62 pagetables:19 bounce:0
[166508.110000]  free:89 free_pcp:2 free_cma:0
[166508.110000] Normal free:356kB min:944kB low:1180kB high:1416kB active_anon:1696kB inactive_anon:80kB active_file:56kB inactive_file:164kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:65536kB managed:56220kB mlocked:0kB dirty:0kB writeback:0kB mapped:16kB shmem:248kB slab_reclaimable:992kB slab_unreclaimable:7456kB kernel_stack:480kB pagetables:76kB unstable:0kB bounce:0kB free_pcp:8kB local_pcp:8kB free_cma:0kB writeback_tmp:0kB pages_scanned:1896 all_unreclaimable? yes
[166508.110000] lowmem_reserve[]: 0 0
[166508.110000] Normal: 85*4kB (UM) 2*8kB (M) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 356kB
[166508.110000] 117 total pagecache pages
[166508.110000] 0 pages in swap cache
[166508.110000] Swap cache stats: add 0, delete 0, find 0/0
[166508.110000] Free swap  = 0kB
[166508.110000] Total swap = 0kB
[166508.110000] 16384 pages RAM
[166508.110000] 0 pages HighMem/MovableOnly
[166508.110000] 2329 pages reserved
[166508.370000] kworker/u2:0: page allocation failure: order:0, mode:0x20
[166508.370000] CPU: 0 PID: 1430 Comm: kworker/u2:0 Tainted: G         C      4.3.0-1-ARCH #1
[166508.370000] Hardware name: Freescale MXS (Device Tree)


What is this? What should I do?

lambda

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Re: Archlinux and wifi
« Reply #4 on: November 18, 2015, 01:38:00 PM »
Looks like you are running out of RAM.

Maybe you have some memory leak - i think it would need to be from some module or the kernel, because otherwise the oom-killer should "fix" this. But then I don't know if the oom-killer is disabled by some setting in your kernel.

Anyway: Have a close look at your memory usage.

HTH,
Harald

iafo1

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Re: Archlinux and wifi
« Reply #5 on: November 18, 2015, 07:37:22 PM »
Hi!

You are right. I do
Code: [Select]
free -m
and I see the "available Memory" slowly decreasing untill it doesn't stop working.
To me seems clear it is related to the wifi because if I use a board without wifi but with ethernet I have no problems.
But how can I go deeper in the issue? Is it a bug of archlinux or my fault?
Thank you

lambda

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Re: Archlinux and wifi
« Reply #6 on: November 18, 2015, 09:12:10 PM »
To me seems clear it is related to the wifi because if I use a board without wifi but with ethernet I have no problems.
But how can I go deeper in the issue? Is it a bug of archlinux or my fault?

You could try to test if/how you can influence the rate of memory consumption.
You could also try if unloading some module frees the memory.

And as I just recently recommended in the other thread: If you don't actually need the legacy kernel for something then switching to mainline will fix lots of problems.

HTH,
Harald

iafo1

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Re: Archlinux and wifi
« Reply #7 on: November 20, 2015, 11:32:44 AM »
Sorry for the naive question.
What is the difference between mainline and legacy kernel?
Thanks.

lambda

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Re: Archlinux and wifi
« Reply #8 on: November 20, 2015, 02:22:49 PM »
Sorry for the naive question.
What is the difference between mainline and legacy kernel?

See https://www.olimex.com/forum/index.php?topic=4883.msg20319#msg20319

If you still have questions feel free to ask here.

HTH,
Harald

swahren

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Re: Archlinux and wifi
« Reply #9 on: November 20, 2015, 04:13:15 PM »
Here is a short table to compare the supported Kernel features for i.MX233 (without any warranty):

legacymainline
Kernel version2.6.354.3+
LRADCyesyes (staging)
AudioyesWIP
cpufreqyesWIP
DCPyesyes
devicetreenoyes
GPIOyesyes
I2Cyesyes
LCDIFyesyes
NANDyesyes
OCOTPyesavailable in 4.4
PMUyesWIP
PSWITCHyesWIP
PXPyesno
PWMyesyes
RTCyesyes
SD/MMCyesyes
SPIyesyes
TV-Outyesno
UARTyesyes
USB Hostyesyes
USB Gadgetyesyes
Watchdogyesyes