linux-kernel - Re: ath9k_htc: Every 2nd packet 1000ms delayed in recent kernels

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Date:	Tue, 19 Jun 2012 15:11:38 +0530
From:	Mohammed Shafi <shafi.wireless@...il.com>
To:	Michael Leun <lkml20120218@...ton.leun.net>
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ath9k_htc: Every 2nd packet 1000ms delayed in recent kernels

Hi,

On Tue, Jun 19, 2012 at 12:21 PM, Michael Leun
<lkml20120218@...ton.leun.net> wrote:
> Hi,
>
> ne-wlan1@...ktra:/home/ml4> ping 192.168.2.1
> PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
> 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=2010 ms
> 64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=1011 ms
> 64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=11.5 ms
> 64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=1.12 ms
> 64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=1002 ms
> 64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=3.83 ms
> 64 bytes from 192.168.2.1: icmp_seq=7 ttl=64 time=1003 ms
> 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=4.10 ms
> 64 bytes from 192.168.2.1: icmp_seq=9 ttl=64 time=1003 ms
> 64 bytes from 192.168.2.1: icmp_seq=10 ttl=64 time=3.95 ms
> 64 bytes from 192.168.2.1: icmp_seq=11 ttl=64 time=1003 ms
> 64 bytes from 192.168.2.1: icmp_seq=12 ttl=64 time=3.78 ms
>
>
> Please note the additional delay of ~1000ms every 2nd packet. This is
> Kernel 3.4.3, have seen it in 3.4.2 also. Does NOT happen in 3.3.1.
>
> Is this Issue already known? If so, I can save the work bisecting...

looks like some one reported this bug in kernel bugzilla. would be
saving us lot of time
if you can bisect it!

>
> Happens with two different ath9k_htc cards:
>
> Bus 002 Device 012: ID 0846:9018 NetGear, Inc. WNDA3200 802.11abgn Wireless Adapter [Atheros AR7010+AR9280]
> Bus 002 Device 004: ID 0cf3:7015 Atheros Communications, Inc. TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287]
>
> Does NOT happen with an atk9k (mini pci express) card.

thanks for the info!

>
> --
> MfG,
>
> Michael Leun
>
> --
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-- 
thanks,
shafi
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