Re: stuck tcp connections 2.6.26-rc7

On Tue, Jun 24, 2008 at 11:25 PM, Justin Mattock
<justinmattock@xxxxxxxxx> wrote:
On Tue, Jun 24, 2008 at 8:03 PM, Justin Mattock <justinmattock@xxxxxxxxx> wrote:
On Tue, Jun 24, 2008 at 5:16 PM, Ray Lee <ray-lk@xxxxxxxxxxxxx> wrote:
2008/6/23 Justin Mattock <justinmattock@xxxxxxxxx>:
On Mon, Jun 23, 2008 at 5:04 PM, Didier Raboud <didier@xxxxxxxxxx> wrote:
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Hash: SHA1

Justin Mattock wrote:

On Mon, Jun 23, 2008 at 3:59 AM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
On Sun, 22 Jun 2008 18:09:16 +0000 "Justin Mattock"
<justinmattock@xxxxxxxxx> 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.
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