[ath9k-devel] ath9k_htc kernel driver regression affecting throughput

[Oleksij Rempel <linux@rempel-privat.de>]

Am 31.08.2016 um 05:52 schrieb bruce m beach:
>> I'm starting to get concerned that it will never get fixed, especially since
>> I can't seem to convince anybody that it's real or that it's a problem. I've
>> got wireshark installed and I can watch the signal gum up quickly with
>> malformed packages, dup awks, spurious retransmissions, and terminations, but
>> I don't know how to translate that into identifying the problem in the
>> driver/module.
> 
> I tried to boot linux-4.7.2 to try to see if I have the same problem but the
> video is broken on samsung exynos (again) so I can't do anything until
> the video is fixed, unless there is someway to backport 4.7.x or 4.4.x
> to 4.2.2 ( anybody? ) Meanwile have you tried getting a really good wireless
> link within the immediate vicinity of your wireless device? Have you tried
> a different link with a completely different ap.
> 
>>  I am surprised this basic functionality in managed mode has persisted for so
>>  long without other people noticing it or addressing it
> 
> This is the thing: If it is true then why are there no other reports of
> this behaviour. None the less I wouldn't give up, these impossible things
> usually get resolved and become history as long as you stick  to it.
> 
> 
> Bruce
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
> 

here are test results which i get with recent kernel:

uname -a
Linux ultralex 4.8.0-rc3-00201-gaf56ff2 #200 SMP Sun Aug 28 14:14:36
CEST 2016 x86_64 x86_64 x86_64 GNU/Linux


./tests zwerg.local
tcp from client to server
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
zwerg.local () port 0 AF_INET : demo
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    10.04      24.80
tcp from server to client
MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
zwerg.local () port 0 AF_INET : demo
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    10.00      48.61
udp from client to server
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
zwerg.local () port 0 AF_INET : demo
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   65507   10.02        1062      0      55.57
212992           10.02        1062             55.57

two tcp tasts at same time. both directions
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
zwerg.local () port 0 AF_INET : demo
MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
zwerg.local () port 0 AF_INET : demo
Interim result:   49.69 10^6bits/s over 5.001 seconds ending at
1472655100.562
Interim result:   50.81 10^6bits/s over 5.001 seconds ending at
1472655105.562
Interim result:    1.25 10^6bits/s over 19.644 seconds ending at
1472655115.205
Interim result:   25.92 10^6bits/s over 9.793 seconds ending at
1472655115.355
Interim result:    1.71 10^6bits/s over 5.059 seconds ending at
1472655120.264
Interim result:   50.22 10^6bits/s over 5.015 seconds ending at
1472655120.370
Interim result:    1.67 10^6bits/s over 5.036 seconds ending at
1472655125.300
Interim result:   49.50 10^6bits/s over 5.072 seconds ending at
1472655125.442
Interim result:    1.69 10^6bits/s over 5.036 seconds ending at
1472655130.336
Interim result:   50.05 10^6bits/s over 5.001 seconds ending at
1472655130.444


Since it is not my reference setup i can't absolute maximum, but what i
get in this busy network with 20HT is not bad - 50Mbit/s!

I would suggest to start with git bisect to track down actual source of
regression.


-- 
Regards,
Oleksij

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