netdev - Re: stuck tcp connections 2.6.26-rc7

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Date:	Tue, 24 Jun 2008 20:03:22 +0000
From:	"Justin Mattock" <justinmattock@...il.com>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	"Didier Raboud" <didier@...oud.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: stuck tcp connections 2.6.26-rc7

On Tue, Jun 24, 2008 at 5:16 PM, Ray Lee <ray-lk@...rabbit.org> wrote:
> 2008/6/23 Justin Mattock <justinmattock@...il.com>:
>> On Mon, Jun 23, 2008 at 5:04 PM, Didier Raboud <didier@...oud.com> wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> Justin Mattock wrote:
>>>
>>>> On Mon, Jun 23, 2008 at 3:59 AM, Andrew Morton
>>>> <akpm@...ux-foundation.org> wrote:
>>>>> On Sun, 22 Jun 2008 18:09:16 +0000 "Justin Mattock"
>>>>> <justinmattock@...il.com> wrote:
>>>>>
>>>>>> Hello; I too am experiencing internet connectivity problems, for  a
>>>>>> while I thought
>>>>>> It was due to low bandwidth(or being ddos attacked) but yesterday I
>>>>>> noticed with watch netstat -ntu
>>>>>> send-Q was stuck on a number; the connection would not go to TIME_WAIT
>>>>>> resulting in music to pause, and t.v. to freeze.
>>>>>> In my experiences running xmms streaming music is fine, no problems,
>>>>>> but as soon as
>>>>>> you watch something with flash player the stream start's getting
>>>>>> really bad. In the past with older kernel's
>>>>>> I usually can watch t.v.(with flash) and stream music at the same time
>>>>>> without any trouble.
>>>>>> lately I've been Running the kernel in No forced Preemption with a
>>>>>> time frequency at 100. having the kernel set in this mode really shows
>>>>>> the connection problems, but if I change the preemption to another,
>>>>>> and bump up the timer frequency the poor internet connection is not as
>>>>>> bad(or stuck tcp) but still prevalent. more pops in the music, and
>>>>>> sudden internet loss for around five seconds, then goes back
>>>>>> So from over here streaming music has no problems from what I can see,
>>>>>> but as soon as I watch media, it becomes a mess.
>>>>>
>>>>> (cc netdev)
>>>>>
>>>>
>>>>
>>>> Cool, Thanks for sending the cc
>>>> regards;
>>>
>>> Hi,
>>>
>>> I get something like a similar bug: when pinging my local gateway, I loose
>>> packets (over wifi (iwl3945) ). Before the update to 2.6.26-rc7 (Debian), I
>>> had no such issues (which makes Internet browsing working but weirdly).
>>>
>>> I can't know for sure that my bug is related to the above, but suppose so.
>>> Please ask for details !
>>>
>>> Regards,
>>>
>>> Didier Raboud
>>> - --
>>
>> Cool;(cool as in I'm not the only one,not cool for sh*%y internet connections)
>> there is something definitely happening with the tcp connection.,
>> After looking more at the situation
>> I get a good connection when just streaming music, but as soon as I
>> watch with flash or even search through firefox
>> I'm getting a dead period of no internet, and then a few seconds later
>> no problems.Almost as if some timer in the code is missing something
>> or not firing off at the right time.
>> At this point I'm still uncertain with what is happening.
>> regards;
>
> If you leave a ping running as root to your local gateway from a
> console ( nice -n -10 ping -i 0.5 192.168.1.1
>  or whichever ip ), does it show dropouts?
>

I'll give that a try and see what happens.
regards;

-- 
Justin P. Mattock
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