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little_bob
Retired Dev
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Joined: 27 Jul 2004
Posts: 34

PostPosted: Wed Dec 12, 2012 6:38 am    Post subject: kernel 3.3.8-gentoo / SW-IOMMU messages Reply with quote

hi community,

i have a box with
- gentoo kernel 3.3.8
- usb wlan stick TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287]
- asrock Z77E-ITX

i am using this box as a wlan access point.

it is running since a few days. now i have the following entry in my messages file which comes a few times every second
Code:

Dec 12 06:17:32 bespin kernel: [299112.882203] DMA: Out of SW-IOMMU space for 16 bytes at device 0000:00:1d.0


lspci show that device 1d.0 is the usb controller

Code:

00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)


so i guess this comes from the usb wlan stick. also since this kernel message i am not able to establish a wlan connection with a client.

i am using this config - hostapd
Code:

interface=wlan3
bridge=br0
driver=nl80211
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=hutzi2013!
#macaddr_acl=0
auth_algs=3
eap_server=0
eapol_key_index_workaround=0
own_ip_addr=127.0.0.1
wpa=3
ieee8021x=0
wpa_passphrase=**********
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP TKIP
hw_mode=g
channel=8
wme_enabled=1
ieee80211n=1


do i have a missmatch in my config from hostapd or in my kernel?

best regards

--christian
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little_bob
Retired Dev
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Joined: 27 Jul 2004
Posts: 34

PostPosted: Wed Dec 12, 2012 7:00 am    Post subject: Reply with quote

additional info.

when the error come up i was using vlc to watch a video. the video file was mounted via nfs.
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_______0
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Joined: 15 Oct 2012
Posts: 521

PostPosted: Tue Dec 18, 2012 1:51 pm    Post subject: upgrade Reply with quote

I have the exact same hardware and had the same issue which was resolved by updating to 3.7.0.

best regards.
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_______0
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Joined: 15 Oct 2012
Posts: 521

PostPosted: Tue Dec 18, 2012 1:59 pm    Post subject: upgrade Reply with quote

I have the exact same hardware and had the same issue which was resolved by updating to 3.7.0.

best regards.
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