Internet connection speed is slowing down on Fedora 11

student8185 · 08-25-2009, 10:42 PM

Hello everybody

I am using fedora 11 now, and I see that while surfing (by firefox) and downloading (by download managers) the internet speed is slowing down and some of my command line installations (using yum) are failed due to time out errors.
The speed is going up and down repeatedly.(Average speed is slow)

I am connecting to the internet by connecting to a LAN in my workplace and then using a VPN(Virtual Private Network).
I connect to LAN using wireless modem whose driver is newly released from its manufacture.

I have Windows 7 too, and its connection speed is very good.(for both surfing and downloading)

I don't set any proxy server for my connection(in both Windows and Linux)

Before fedora, I have tried Ubuntu(8.10, 9.04) and this problem was exists.

What is the reason for this problem?
How can I solve it?

And I don't know where to ask my question, but I think this is related to network.

Note I am a newbie.
Please help me step by step.

GrapefruiTgirl · 08-25-2009, 10:50 PM

Hi there,

For the time being, this is a good place to put your question.

While I cannot directly help you solve the problem (at least not yet), I will ask that you provide just a little bit more information:

1) Please tell us what is the Make/Model of the wireless device (modem?) that you are using to connect to the LAN. And, tell us about the "Driver that was installed by the manufacturer" -- is that a Linux driver? Or is that the Win7 driver?

2) Please clarify this statement: I have tried Ubuntu(8.10, 9.04) and this problem were exits. <-- Does this mean the problem WAS there on those distros too, or WAS NOT there.

Thank you, & regards.

Sasha

student8185 · 08-26-2009, 01:50 AM

I have written my first post quickly and I have made some mistakes.
So I've edit post #1.

GrapefruiTgirl: sorry for that!

1)

Code:

#lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
02:09.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
02:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
02:09.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
02:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
02:09.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff)
09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 12)
0b:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01)

At first fedora does not detect wireless modem.
I find the driver by searching and asking in forums
The driver: http://www.broadcom.com/support/802.11/linux_sta.php

I have installed the 64 version, using manual of the driver
After that, wireless card is turned on and starts working:

Code:

#iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

eth1      IEEE 802.11  Nickname:""
          Access Point: Not-Associated   
          Link Quality:4  Signal level:198  Noise level:165
          Rx invalid nwid:0  invalid crypt:0  invalid misc:0

pan0      no wireless extensions.

ppp0      no wireless extensions.

2) Ubuntu(both 8.10 and 9.04) detects modem, and installed its driver, But the problem were exists.Connection speed was too slow.

Now, Do you think that this problem relates to driver?

Another note,
I've installed NetworkManagerPPTP for VPN in fedora.
May this problem relates to VPN configuration?

Thanks!

GrapefruiTgirl · 08-26-2009, 09:00 AM

Quote:

#72238 - 20% lower throughput on channels 149, 153, 157, and 161

I noticed the above, from the README file for the driver you're using, located here.

Is there any chance (I'm not sure how you would check) that you're on one of these channels, and experiencing this 20% reduction in speed? Does 20% sound like approximately the slowness you are experiencing, compared to using the network from the Win OS?

Sasha

student8185 · 08-27-2009, 07:09 AM

Quote:

Originally Posted by GrapefruiTgirl

Is there any chance (I'm not sure how you would check) that you're on one of these channels, and experiencing this 20% reduction in speed? Does 20% sound like approximately the slowness you are experiencing, compared to using the network from the Win OS?

I don't know how to find current modem channel.
But I am sure that this is not the case.
Because the ratio is more than 20%, the reduction is approximately 70%-90%.

It is possible that "lower throughput" reduces speed,
but this is not the main reason.

Quote:

Another note,
I've installed NetworkManagerPPTP for VPN in fedora.
May this problem relates to VPN configuration?

Without having a strong connection I can not migrate to Linux.
Do you know any other way(s) to find out the reason?

Thank you

student8185 · 08-29-2009, 07:03 AM

Hello everybody
If you can, please send me a solution or at least an address for another forum or wiki that can help me!

If you know any solution for another distro(such Ubuntu or Debian)
please tell me.

Thanks