Date:	Wed, 25 Jun 2008 16:22:28 +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 Wed, Jun 25, 2008 at 3:16 PM, Ray Lee <ray-lk@...rabbit.org> wrote:
> On Tue, Jun 24, 2008 at 11:25 PM, Justin Mattock
> <justinmattock@...il.com> wrote:
>> On Tue, Jun 24, 2008 at 8:03 PM, Justin Mattock <justinmattock@...il.com> wrote:
>>> 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
>>>
>>
>> Hmm, well I really don't know what to say with the tcp
>> connection(issue), It seems to go in and out of phases i.g.
>> at first running music, and t.v.(through flash) there's moments of
>> pauses,(around 5 secs or so) then after a while
>> the tcp seems to even itself out, but then after a while(5min or so)
>> the same pauses begin. Maybe due to some missing packet, or
>> some deadlock if this is proper to say.
>
> On my system, I've noticed that the flashplugin can manage to starve
> other processes in a pure scheduler sort of way, so you might try
> running latencytop to see if there's some sort of issue there. OTOH,
> I've noticed firefox itself hang for 3-15 seconds in the middle of a
> read (just as you describe), with nothing else going on in the system,
> so <shrug>. I've been blaming firefox, but I could be wrong.
>

I agree, after playing around with different applications I'm noticing
this around firefox and flash as well.
When watching T.V. through mplayer there is no problem at all i.g.
having three T.V. stations playing all at
once plus music streaming gives me no errors or pauses at all, not
even any pops in the music.
But as soon as I load firefox the pauses occur, and so forth(ussually
have to restart firefox a couple of times to have it run smooth).
    Maybe there is something in about:config that can resolve
this(I'll have to look into it)
regards;
-- 
Justin P. Mattock
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