Wireless slowdowns

[Sepherosa Ziehau]

On Thu, Oct 23, 2008 at 8:35 AM, Petr Janda
<elekktretterr at exemail.com.au> wrote:
> Hi there,
> Ive been experiencing slow downs on my workstation wireless on DragonFly and
> FreeBSD (freebsd is even worse at this). Basically it runs at crawling speed
> although the apprent speed is 18MB right now.

The rate shown by ifconfig if for packet size < 256.

>
> ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>        inet6 fe80::20f:b5ff:fefa:9196%ath0 prefixlen 64 scopeid 0x2
>        inet 192.168.1.50 netmask 0xffffff00 broadcast 192.168.1.255
>        ether 00:0f:b5:fa:91:96
>        media: IEEE 802.11 Wireless Ethernet autoselect (OFDM/18Mbps)
>        status: associated
>        ssid homenetwork channel 11 bssid 00:19:db:0a:39:e6
>        authmode OPEN privacy OFF txpowmax 37 bmiss 7 protmode CTS burst
>        bintval 100
>
> Interestingly my laptop which also has an atheros chip doesnt experience any
> slow downs neither in DragonFly or FreeBSD. When I reboot my workstation to
> Windows XP it works absolutelty flawlessly. I know Ive had this issue before
> and Sephe made me a patch which improved it but it still is not perfect and
> lately its been really bugging me especially when Im sshing to my server next
> door to do my job and it keeps slowing down to crawl, and then speeding up
> and slow down and it goes like this forever.
>
> What kind of tcpdumps and debugging would you like to help you find the
> problem?

You could grab an ieee802_11 dump and an ieee802_11_radio dump for me.
And please post output of 'ifconfig ath0 list scan' after you have
associated with the AP.

Best Regards,
sephe

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