On Fri, Jul 3, 2009 at 11:43 PM, David Webber <dwebber@xxxxxxxxxxxx> wrote: > > I'm trying to use Jaunty on my Centrino laptop as a wireless access > point / NAT. My cable modem is plugged in to the ethernet port. > Strangely, when I enable the wireless card (via hostapd or simply > 'ifconfig wlan1 192.168.0.1 up'), my WIRED network slows down. On a > terminal on the laptop, I see transfer speeds drop from over about 200 > K/s to about 40 K/s. As far as I can tell, the problem is not affected > by iptables rules, ip_forward on/off, or ipv6. Just having the > wireless card present and active seems to affect the wired interface. > The problem may have something to do with having hostapd active, but > I'm not sure. > > Aside: I have an intel wireless card built-in but since it can't do > hostap-mode, I purchased the ath9k cardbus card. The intel card is > disabled by function-key and is not active on boot. I have recent > versions of the kernel and hostapd from the subversion repositories > discussed on linuxwireless.org. > > Linux version 2.6.30-custom-wl (root@whitebook) (gcc version 4.3.3 > (Ubuntu 4.3.3-5ubuntu4) ) #1 SMP Thu Jun 18 19:22:02 CDT 2009 > > 00:00.0 Host bridge: Intel Corporation 82852/82855 GM/GME/PM/GMV > Processor to I/O Controller (rev 02) > 00:00.1 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV > Processor to I/O Controller (rev 02) > 00:00.3 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV > Processor to I/O Controller (rev 02) > 00:02.0 VGA compatible controller: Intel Corporation 82852/855GM > Integrated Graphics Device (rev 02) > 00:02.1 Display controller: Intel Corporation 82852/855GM Integrated > Graphics Device (rev 02) > 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 03) > 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 03) > 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 03) > 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) > USB2 EHCI Controller (rev 03) > 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 83) > 00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface > Bridge (rev 03) > 00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE > Controller (rev 03) > 00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) > SMBus Controller (rev 03) > 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 03) > 00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) > AC'97 Modem Controller (rev 03) > 01:01.0 Network controller: Intel Corporation PRO/Wireless 2200BG > [Calexico2] Network Connection (rev 05) > 01:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. > RTL-8139/8139C/8139C+ (rev 10) > 01:04.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus > Controller (rev 02) > 01:05.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306 Fire II > IEEE 1394 OHCI Link Layer Controller (rev 80) > 02:00.0 Network controller: Atheros Communications Inc. AR5008 > Wireless Network Adapter (rev 01) > > Speed test: > (start with everything active. NAT works, other computers can reach > the internet through the laptop, but the speed is just slow. For this > test, no other machines were connected so they're not consuming the > bandwidth) > $ wget http://cosmos.cites.uiuc.edu/pub/ubuntu-iso/9.04/ubuntu-9.04-desktop-amd64.iso > [snip] 47.6K/s eta 4h 56m > $ sudo ifdown wlan1 > [snip] 44.5K/s eta 5h 54m > $ sudo ifconfig mon.wlan1 down > [snip] 245K/s eta 45m 7s > > As you can see, I lose about a factor of 5 when the wireless card is active. > > I also posted this question to > https://answers.launchpad.net/ubuntu/+question/76037 > > Thanks in advance, > David I tracked this down to the Realtek ethernet. When I plugged my cable modem over USB rather than over ethernet, the speed improved to normal. I've seen on other forums a problem with slowness using reatek ethernet. Strange that it would only show up when two network interfaces are active though. David -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
