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Re: Poor WiFi Performance



On Sun, Jan 25, 2009 at 07:57:26PM +0100, Phil Bieber wrote:
> 
> Hi everybody!
> I've recently switched from Ubuntu to Fedora 10 to escape a nasty
> problem I'm having but without luck.
> I have a DELL Inspiron 640m / e1405 notebook based on a Centrino
> chipset with an Intel 3945abg WiFi card and my network connection is
> painfully slow. I have a 16MBit/s ADSL connection (according to the
> router 14069 kbit/s down and 1189 kbit/s up) and when trying a speed
> test I get the following results with Epiphany on Fedora 10:
> Down: 200 - 250 kbit/s
> Up: 60-80 kbit/s
> 
> With Internet Explorer 7 on Windows I get the following:
> Down: 7500 - 9700 kbit/s
> Up: ~1100 kbit/s
> 
> I tried it 3 times on both OS's and within about 10 minutes. The
> results from my Fedora tests are way better than expected, because it
> sometimes takes up to 5 minutes to open google...
> 
> The WiFi network I'm connected to is a WPA encrypted G network with
> the AP about 5 meters away from my notebook.
> 
> I already did some googling but so far I haven't sound anything that
> helped. I even tried the Windows drivers using ndsiwrapper but I
> couldnt get them to load properly.
> 
> The following is the output from lspci:
> 
> [root hekate ~]# lspci
> 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML
> and 945GT Express Memory Controller Hub (rev 03)
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
> 943/940GML Express Integrated Graphics Controller (rev 03)
> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME,
> 943/940GML Express Integrated Graphics Controller (rev 03)
> 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High
> Definition Audio Controller (rev 01)
> 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express
> Port 1 (rev 01)
> 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express
> Port 2 (rev 01)
> 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express
> Port 4 (rev 01)
> 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
> UHCI Controller #1 (rev 01)
> 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
> UHCI Controller #2 (rev 01)
> 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
> UHCI Controller #3 (rev 01)
> 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
> UHCI Controller #4 (rev 01)
> 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2
> EHCI Controller (rev 01)
> 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)
> 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface
> Bridge (rev 01)
> 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family)
> SATA IDE Controller (rev 01)
> 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
> 02:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
> 02:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
> 02:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro
> Host Adapter (rev 19)
> 02:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host
> Adapter (rev 0a)
> 02:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05)
> 0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG
> Network Connection (rev 02)
> [root hekate ~]#
> 
> 
> 
> I would greatly appreciate any help you can give me!
> 

What MTU is being used?  With ADSL try 1492.
Watch out for network zeroconfig configuration setting up unexpected links too.



-- 
	Regards,
	T o m   M i t c h e l l


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