I hate replying to my own message, but this is what Mandriva wrote
about it.
See also  Bug
#27073.
If this does not resolve the problem, there is another possibility.
Most Linux distributions, including Mandriva, enable a kernel feature
called TCP window scaling. This is useful for increasing the speed of
transfers over very high bandwidth connections. However, a change was
made in the default values for TCP window scaling in kernel 2.6.17,
which seems to cause very slow network performance for some users with
some internet sites. To see if TCP window scaling is the problem, you
can disable it with this command:
sysctl
-w net.ipv4.tcp_window_scaling=0
If this resolves the problem, you can make the change permanent by
adding this line to the file /etc/sysctl.conf :
- net.ipv4.tcp_window_scaling=0
This will disable TCP window scaling at every boot. If you do use a
very high bandwidth network connection - for instance, you regularly
transfer large files over a local 100Mbit or 1Gbit network - you may
notice that disabling TCP window scaling results in slower performance
over this connection. In this case, you could try restoring the
pre-2.6.17 default settings rather than disabling TCP window scaling
entirely. To do this, add the following line to /etc/sysctl.conf,
instead of (not in addition to) the previously suggested one:
- net.ipv4.tcp_rmem=4096 87380 174760
This will change the default window scaling settings at every boot.
[EMAIL PROTECTED] wrote:
When I installed Ubuntu on a laptop at home, my Internet performance
was horrible. I had installed Ubuntu before, but never had any
issues. I then installed Etch, same issue, same laptop. I tried other
OS's without any success. I then tried an older version of Debian and
it worked fine. I searched Google and found a little blurp about
window size and routers and the newer kernels.
I don't know if this will help you, but with the machine running, open
a terminal window, go to root mode and cat
/proc/sys/net/ipv4/tcp_window_scaling. If it is set to 1, change it to
0 with echo "0" > /proc/sys/net/ipv4/tcp_window_scaling. Close FF
and try again.
The difference was night and day for me.
There are a few work arounds, but if this works and you want a
permanent solution, add "net.ipv4.tcp_window_scaling=0" to
/etc/sysctl.conf.
I know there are other settings, but this worked well for me.
[EMAIL PROTECTED]
wrote:
Kenneth wrote:
--- "Robert N. Eaton" <[EMAIL PROTECTED]> wrote:
In Fedora 7 Thunderbird doesn't connect at all: it times out. Firefox
connects to a very few sites and doesn't seem to finish the connection,
no matter how long it tries. Seems like a software problem, but _which_
software? SELinux? Firewall?
When firefox doesn't connect, what does the status bar say it's doing?
looking up host, waiting for reply?
What's the output of "ifconfig -a" ?
[EMAIL PROTECTED] sbin]$ ./ifconmfig -a
eth0 Link encap:Ethernet HWaddr 00:05:5D:34:C3:19
inet addr:192:168:0:3 Bcast:192:168:0:255 Mask:255:255:255:0 inet6
addr fe80::255:5dff:fe34:c319/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:57 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2195 (2.1 KB) TX bytes:10602 (10.3 KiB)
Interrupt:20 Base address:0x4000
eth1 Link encap:Ethernet HWaddr 00:50:8D:E5:8D:12
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:16 Base address:0x8000
lo Link encap:Local loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:10274 errors:0 dropped:0 overruns:0 frame:0
TX packets:10274 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:89837264 (85.6 Mib) TX bytes:89837264 (85.6 MiB)
[EMAIL PROTECTED] sbin]$
If there are any errors, it's my typing. This is worse than sneakernet;
I couldn't figure a protocol to write the ./ifconfig -a output to a
floppy and then cut and paste in WinXP Thunderbird. I had to print it
out and then reboot into WinXP, open Thunderbird, type it in by hand,
and I'm a lousy typist.
Bob
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