Re: ath9k AR9382 high latency ping

[Felix Fietkau <nbd@openwrt.org>]

On 2013-11-14 10:23, Bruno Randolf wrote:
> Hello All!
> 
> Here is another ath9k PCIe card I have problems with in a Intel Atom
> N2600 embedded board (Advantech MIO-2261N). This is the same board I was
> reporting problems with the AR9287 before. I exchanged the card for an
> AR9382 and at least I can associate now.
> 
> It's a AR9382 (Unex DNXA-116) and the PCI ID 168c:0030 subsystem
> 168c:3116, reported as "AR9300 Rev:3"...
> 
> The symptom are ping times of around 1000ms, when connected to an AP
> (very close, I expect around 2ms), eg.
> 
> 64 bytes from 192.168.5.1: icmp_seq=1 ttl=64 time=1237 ms
> 64 bytes from 192.168.5.1: icmp_seq=2 ttl=64 time=1403 ms
> 64 bytes from 192.168.5.1: icmp_seq=3 ttl=64 time=1567 ms
> 64 bytes from 192.168.5.1: icmp_seq=4 ttl=64 time=1728 ms
> 
> The same card works fine in another Laptop, BTW, so it must be a problem
> specific to this board.
> 
> I run wireless-testing from yesterday and I tried with different
> combinations of enabling/disabling ASPM in the BIOS and booting with
> pcie_aspm=off pcie_aspm=force all of which has the same result...
Have you checked for IRQ issues? That seems likely given that packets
are sent, but the tx path is still considered hung.

- Felix