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Old 02-09-2010, 12:05 AM
William Case
 
Default Extremely slow web page loading to only 1 site ?

Hi;

For what it is worth, I have the same kind of problem but ...

On Fri, 2010-02-05 at 17:33 -0700, Linuxguy123 wrote:
> This has me scratching my head.
>
> My access to www.rv.net is extremely slow. With both Konqueror and
> Firefox. And yet others say they have good access times.
>
> I'm running a fully up to date F12 installation.
>

It is on a wired network. Epiphany has really slowed down loading
various sites while Firefox seems to have retained most of its speed.

I am not stealing this thread; I have posted my problem in an earlier
thread. However, as you try to solve this Linux problem you might want
to look elsewhere or deeper than just a wireless network problem.

--
Regards Bill
Fedora 12, Gnome 2.28
Evo.2.28, Emacs 23.1.1

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Old 02-09-2010, 02:25 AM
Ed Greshko
 
Default Extremely slow web page loading to only 1 site ?

Bruno Wolff III wrote:
> On Tue, Feb 09, 2010 at 08:21:33 +0800,
> Ed Greshko <Ed.Greshko@greshko.com> wrote:
>
>> In the back of my mind, from a few years ago, I remember there an issue
>> with the linux TCP/IP stack and some "mis-configured" routers. I need
>> to get some coffee and hopefully my brain will get in gear....
>>
>
> I believe that was ECN. (A way to signal congestion without throwing away
> packects.)
>
> There have also been problems with MTU discovery because people block ICMP
> packets indiscrimiantly.
>
>
That is starting to stir the synapse....

The problem is related to what is in the "syn, ack" packet coming from
12.17.249.39. In the TCP Options it is sending "Window scale: 0
(multiply by 1)". I think this is causing problems since later packets
have the TCP data segment being only 92 bytes from 12.17.249.39.

While the same info is in the "syn, ack" the RHELv4 system seems to deal
with it OK and the TCP data segments from 12.17.249.39 are 1460 bytes.

The "problem" can be fixed by....

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

Now, while this fixes the problem for this site it may cause performance
issues with other sites. I don't know at this point and my head hurts.
:-) It is hurting since my RHELv4 system has tcp_window_scaling set to
1 and it seems to deal with it.

Note: Make sure you issue the "echo" above after some quite time. The
connection must first be rst (reset) before the sides will renegotiate
the TCP/IP settings. (That too caused me some grief.)

I'll bugzilla it....







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Old 02-09-2010, 02:37 AM
Linuxguy123
 
Default Extremely slow web page loading to only 1 site ?

On Tue, 2010-02-09 at 11:25 +0800, Ed Greshko wrote:

> That is starting to stir the synapse....
>
> The problem is related to what is in the "syn, ack" packet coming from
> 12.17.249.39. In the TCP Options it is sending "Window scale: 0
> (multiply by 1)". I think this is causing problems since later packets
> have the TCP data segment being only 92 bytes from 12.17.249.39.
>
> While the same info is in the "syn, ack" the RHELv4 system seems to deal
> with it OK and the TCP data segments from 12.17.249.39 are 1460 bytes.
>
> The "problem" can be fixed by....
>
> echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
>
> Now, while this fixes the problem for this site it may cause performance
> issues with other sites. I don't know at this point and my head hurts.
> :-) It is hurting since my RHELv4 system has tcp_window_scaling set to
> 1 and it seems to deal with it.

> Note: Make sure you issue the "echo" above after some quite time. The
> connection must first be rst (reset) before the sides will renegotiate
> the TCP/IP settings. (That too caused me some grief.)

Questions:

a) does an "echo 1 /proc/sys/net/ipv4/tcp_window_scaling" put the system
back to what it is now ?

$cat /proc/sys/net/ipv4/tcp_window_scaling
1

b) does the command have to be issued after every reboot / login ?

c) please tell us more on resetting the network connection.


> I'll bugzilla it....

Thanks !

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Old 02-09-2010, 02:49 AM
Ed Greshko
 
Default Extremely slow web page loading to only 1 site ?

Linuxguy123 wrote:
> On Tue, 2010-02-09 at 11:25 +0800, Ed Greshko wrote:
>
>
>> That is starting to stir the synapse....
>>
>> The problem is related to what is in the "syn, ack" packet coming from
>> 12.17.249.39. In the TCP Options it is sending "Window scale: 0
>> (multiply by 1)". I think this is causing problems since later packets
>> have the TCP data segment being only 92 bytes from 12.17.249.39.
>>
>> While the same info is in the "syn, ack" the RHELv4 system seems to deal
>> with it OK and the TCP data segments from 12.17.249.39 are 1460 bytes.
>>
>> The "problem" can be fixed by....
>>
>> echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
>>
>> Now, while this fixes the problem for this site it may cause performance
>> issues with other sites. I don't know at this point and my head hurts.
>> :-) It is hurting since my RHELv4 system has tcp_window_scaling set to
>> 1 and it seems to deal with it.
>>
>
>
>> Note: Make sure you issue the "echo" above after some quite time. The
>> connection must first be rst (reset) before the sides will renegotiate
>> the TCP/IP settings. (That too caused me some grief.)
>>
>
> Questions:
>
> a) does an "echo 1 /proc/sys/net/ipv4/tcp_window_scaling" put the system
> back to what it is now ?
>
Yes. You can "cat /proc/sys/net/ipv4/tcp_window_scaling" to see it is
set to "1" by default.
> $cat /proc/sys/net/ipv4/tcp_window_scaling
> 1
>
> b) does the command have to be issued after every reboot / login ?
>
It is defaulted to "1" at boot. So, if you want to have it set to "0"
you'll either have to issue the echo command or place the following in
/etc/sysctl.conf

net.ipv4.tcp_window_scaling = 0

(you need the spaces).
> c) please tell us more on resetting the network connection.
>
>
Nothing needs to be done to reset the connection. It will do so after a
time of inactivity between your system and the affected web site. (The
resets are per connection). So, if you just visited the site with
scaling set to 1 you should wait a couple of minutes after setting it to
0 before trying again.

Ed

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Old 02-09-2010, 02:51 AM
Ed Greshko
 
Default Extremely slow web page loading to only 1 site ?

Ed Greshko wrote:
>
> You can "cat /proc/sys/net/ipv4/tcp_window_scaling" to see it is
> set to "1" by default.
>
Yes...I know you said that already. Sorry to repeat....my head still
hurts.... :-(

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Old 02-09-2010, 02:53 AM
Linuxguy123
 
Default Extremely slow web page loading to only 1 site ?

On Tue, 2010-02-09 at 11:51 +0800, Ed Greshko wrote:
> Ed Greshko wrote:
> >
> > You can "cat /proc/sys/net/ipv4/tcp_window_scaling" to see it is
> > set to "1" by default.
> >
> Yes...I know you said that already. Sorry to repeat....my head still
> hurts.... :-(


No problem. Thanks for your help !


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Old 02-09-2010, 02:58 AM
Linuxguy123
 
Default Extremely slow web page loading to only 1 site ?

On Tue, 2010-02-09 at 11:49 +0800, Ed Greshko wrote:
> Linuxguy123 wrote:
> > On Tue, 2010-02-09 at 11:25 +0800, Ed Greshko wrote:
> >
> >
> >> That is starting to stir the synapse....
> >>
> >> The problem is related to what is in the "syn, ack" packet coming from
> >> 12.17.249.39. In the TCP Options it is sending "Window scale: 0
> >> (multiply by 1)". I think this is causing problems since later packets
> >> have the TCP data segment being only 92 bytes from 12.17.249.39.
> >>
> >> While the same info is in the "syn, ack" the RHELv4 system seems to deal
> >> with it OK and the TCP data segments from 12.17.249.39 are 1460 bytes.
> >>
> >> The "problem" can be fixed by....
> >>
> >> echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

It loads quickly now. Problem fixed. Thanks.

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Old 02-09-2010, 03:02 AM
Ed Greshko
 
Default Extremely slow web page loading to only 1 site ?

Linuxguy123 wrote:
>
> It loads quickly now. Problem fixed. Thanks.
>
>
Good...

FYI... https://bugzilla.redhat.com/show_bug.cgi?id=563052

Ed

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Old 02-09-2010, 05:59 AM
Tim
 
Default Extremely slow web page loading to only 1 site ?

On Mon, 2010-02-08 at 19:08 -0500, Tom Horsley wrote:
> An awful lot of web sites check the user agent and load
> completely different content and/or redirect to different
> servers.

Or change some operating parameters. Just look at the configuration for
Apache, and you find /special/ differences for certain user agents. You
can see an example, below. I wouldn't be the slightest bit surprised if
wrong assumptions, or bad decisions, are made.


# The following directives modify normal HTTP response behavior to
# handle known problems with browser implementations.
#
BrowserMatch "Mozilla/2" nokeepalive
BrowserMatch "MSIE 4.0b2;" nokeepalive downgrade-1.0 force-response-1.0
BrowserMatch "RealPlayer 4.0" force-response-1.0
BrowserMatch "Java/1.0" force-response-1.0
BrowserMatch "JDK/1.0" force-response-1.0

#
# The following directive disables redirects on non-GET requests for
# a directory that does not include the trailing slash. This fixes a
# problem with Microsoft WebFolders which does not appropriately handle
# redirects for folders with DAV methods.
# Same deal with Apple's DAV filesystem and Gnome VFS support for DAV.
#
BrowserMatch "Microsoft Data Access Internet Publishing Provider" redirect-carefully
BrowserMatch "MS FrontPage" redirect-carefully
BrowserMatch "^WebDrive" redirect-carefully
BrowserMatch "^WebDAVFS/1.[0123]" redirect-carefully
BrowserMatch "^gnome-vfs/1.0" redirect-carefully
BrowserMatch "^XML Spy" redirect-carefully
BrowserMatch "^Dreamweaver-WebDAV-SCM1" redirect-carefully

--
[tim@localhost ~]$ uname -r
2.6.27.25-78.2.56.fc9.i686

Don't send private replies to my address, the mailbox is ignored. I
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Old 02-09-2010, 06:04 AM
Tim
 
Default Extremely slow web page loading to only 1 site ?

On Mon, 2010-02-08 at 18:19 -0600, Steven Stern wrote:
> Installed UserAgentSwitcher addon.
>
> I don't see any speed difference by changing the User Agent settings.

Depending on the site, that mayn't help you. Some will do all sorts of
silly things to decide what browser you have (set and check cookies, try
things with JavaScript, etc.). Quite often what they do is wrong, as
well as a bad idea, and they just dig deeper holes for themselves (and
you, at the same time).

--
[tim@localhost ~]$ uname -r
2.6.27.25-78.2.56.fc9.i686

Don't send private replies to my address, the mailbox is ignored. I
read messages from the public lists.



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