[ath9k-devel] post kernel 4.3.x regressions in ath9k_htc

Why do you starting describing same issue in a new email tread?

please go back to:
[ath9k-devel] ath9k_htc kernel driver regression affecting throughput


Am 31.08.2016 um 21:00 schrieb UsuarioAnonimo:
> I've addressed my concerns previously to the dev mailing list. My case
> as stated previously is the following:
> 
> "My primary conntection to the internet has been the Alfa AWUS036NHA
> wireless adapter which uses the Atheros AR9271 802.11n chipset. The
> applicable linux driver/module and firmware is ath9k_htc. Ever since the
> upgrade from linux kernel 4.3.x to 4.4.x the throughput of the adapter
> chipset has been severely affected making the adapter basically unusable."
> 
> After packet sniffing with Wireshark I'm not sure it's a throughput
> issue, but rather a latency issue with dup_acks and spurious
> retransmissions resulting fairly quickly in malformed packets and
> reconnects as the throughput drops to basically zero. I wish I knew how
> to analyze packets better and make the connection to driver performance.
> 
> I'm still convinced the regressions were introduced between kernel 4.3.x
> and 4.4.x. To that end I have done some investigating. It looks like
> there were a lot of changes to ath9k between versions 4.3 and 4.4 that
> affect the AR9271 chipset. The changes seem to have to do with
> initialization and calling the firmware, and calling the development
> firmware.
> 
> One such change is:
> 
> An extra option is added in ath9k/htc_drv_init.c
>    41 int htc_use_dev_fw = 0;
>    42 module_param_named(use_dev_fw, htc_use_dev_fw, int, 0444);
>    43 MODULE_PARM_DESC(use_dev_fw, "Use development FW version");
> 
> But the big changes are in these two files, hif_usb.c and hif_usb.h
> (diff output b/t vers. 4.3 and 4.4):
> http://lxr.free-electrons.com/diff/drivers/net/wireless/ath/ath9k/hif_usb.c?v=4.3;diffval=4.4;diffvar=v
> http://lxr.free-electrons.com/diff/drivers/net/wireless/ath/ath9k/hif_usb.h?v=4.3;diffval=4.4;diffvar=v
> 
> I was wondering if I'm on to something and if anyone with any knowledge
> would mind double-checking the changes signaled in the diff files to see
> if there could be a regression lurking in there.
> 
> Also, I am happy to run any tests and provide output and log files from
> my various pre-4.3.x kernel OS intalls, which still function perfectly
> well, and the 4.4.x and later OS installs, which are basically unusable.
> They start of fast, but, within a matter of 30 seconds or so, gum up and
> result in 100% packet loss.
> 
> Thank you very much for your attention and consideration.
> 
> 
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
> 


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 213 bytes
Desc: OpenPGP digital signature
Url : http://lists.ath9k.org/pipermail/ath9k-devel/attachments/20160901/b555e49b/attachment.pgp