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#1 2012-12-08 11:10:08

orschiro
Member
Registered: 2009-06-04
Posts: 2,136
Website

Slow wireless connection Intel Corporation Ultimate N WiFi Link 5300

Hello,

My wireless connection is horribly slow. I already tried the often mentioned options for the iwlwifi module such as:

modprobe iwlwifi 11n_disable=1 swcrypto=1

but they did not provide any improvement. Is there anybody with the same wireless card that can reproduce stable and fast connections?

Strangely enough, immediately after the connection was established it is quite fast but then slows down very quickly.

[orschiro@thinkpad ~]$ ping google.com
PING google.com (173.194.70.139) 56(84) bytes of data.
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=1 ttl=47 time=39.4 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=2 ttl=47 time=5.24 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=3 ttl=47 time=9.87 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=4 ttl=47 time=30.5 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=5 ttl=47 time=24.3 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=6 ttl=47 time=26.0 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=7 ttl=47 time=10.1 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=8 ttl=47 time=5.24 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=9 ttl=47 time=63.1 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=10 ttl=47 time=6.59 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=11 ttl=47 time=9.35 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=12 ttl=47 time=14.7 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=13 ttl=47 time=6.40 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=14 ttl=47 time=73.2 ms
64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=15 ttl=47 time=8.23 ms
q64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=17 ttl=47 time=59.2 ms
[orschiro@thinkpad ~]$ pacman -Q linux-firmware linux iwlwifi
linux-firmware 20121118-1
linux 3.6.9-1

Regards

Robert

Last edited by orschiro (2012-12-08 15:26:57)

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#2 2012-12-10 18:36:15

orschiro
Member
Registered: 2009-06-04
Posts: 2,136
Website

Re: Slow wireless connection Intel Corporation Ultimate N WiFi Link 5300

It seems I have made some progress. Although I disabled my bluetooth module the speed issues seem to be related to the bt_coex_active option. I explicitly disabled this option in /etc/modprobe.d/wireless.conf and so far have a perceived more stable connection albeit ping latency is still high.

[orschiro@thinkpad ~]$ cat /etc/modprobe.d/wireless.conf 
#options iwlwifi 11n_disable=1
#options iwlwifi swcrypto=1
options iwlwifi led_mode=1
options iwlwifi bt_coex_active=0

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#3 2012-12-11 21:29:36

orschiro
Member
Registered: 2009-06-04
Posts: 2,136
Website

Re: Slow wireless connection Intel Corporation Ultimate N WiFi Link 5300

options iwlwifi bt_coex_active=0 is sufficient as long as I do not want to use bluetooth simultaneously. However, as soon as I activate bluetooth the connection slows down again.

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