Results 1 to 2 of 2

Thread: hostapd causing "DMA: Out of SW-IOMMU space"?

  1. #1
    Join Date
    Nov 2008
    Beans
    62

    hostapd causing "DMA: Out of SW-IOMMU space"?

    I started to get these errors in dmesg which grinds my system to a halt:


    Code:
        [ 3429.303756] DMA: Out of SW-IOMMU space for 70 bytes at device 0000:02:00.0
        [ 3429.358577] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.360040] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.405897] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.509070] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.561499] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.561938] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
        [ 3429.610809] DMA: Out of SW-IOMMU space for 70 bytes at device 0000:02:00.0
        [ 3429.611818] DMA: Out of SW-IOMMU space for 3860 bytes at device 0000:00:1a.0
    I had just started using hostapd to create a virtual Infrastructure mode, and looked up the device ID:


    Code:
      # lshw|grep 0000:02:00.0 -A 5 -B 5
                   *-network      
                        description: Wireless interface
                        product: RTL8188CE 802.11b/g/n WiFi Adapter
                        vendor: Realtek Semiconductor Co., Ltd.
                        physical id: 0
                        bus info: pci@0000:02:00.0
                        logical name: mon.wlan3
                        version: 01
                        serial: 9c:b7:0d:a5:45:67
                        width: 64 bits
                        clock: 33MHz
    Sure enough wlan3 is my internal wifi, and mon.wlan3 is the dev created by hostapd.

    This is the hostapd.conf I was using at the time, it happened twice and each time I had to reboot to get the system back running right:

    Code:
      interface=wlan3
        driver=nl80211
        ssid=matt
        hw_mode=g
        channel=1
        macaddr_acl=0
        auth_algs=1
        ignore_broadcast_ssid=0
        
        #wpa=3
        #wpa_passphrase="888444111333"
        #wpa_key_mgmt=WPA-PSK
        #wpa_pairwise=TKIP
        #rsn_pairwise=CCMP
        
        #beacon_int=100
        #dtim_period=2
        #max_num_sta=32
        #rts_threshold=2347
        #fragm_threshold=2346
        
        #wep_default_key=1
        #wep_key1="ZzZzZ"
        #wep_key_len_broadcast="5"
        #wep_key_len_unicast="5"
        #wep_rekey_period=300
        
        logger_stdout=-1
        logger_stdout_level=0
    Any ideas? And here is the other device id:



    Code:
      # lshw|grep 0000:00:1a.0 -B 5 -A 5
                *-usb:0           
                     description: USB controller
                     product: 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2
                     vendor: Intel Corporation
                     physical id: 1a
                     bus info: pci@0000:00:1a.0
                     version: 04
                     width: 32 bits
                     clock: 33MHz
                     capabilities: pm debug ehci bus_master cap_list
                     configuration: driver=ehci_hcd latency=0

  2. #2
    Join Date
    Nov 2008
    Beans
    62

    Re: hostapd causing "DMA: Out of SW-IOMMU space"?

    bump.. anybody know?

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •