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Thread: swiotlb buffer is full

  1. #1

    Default swiotlb buffer is full

    Code:
    sudo cat /var/log/messages | grep -i "b44 0000:02:0e.0: swiotlb buffer is full"
    .....
    localhost kernel: [ 6951.642247] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    ....
     dmesg | grep -i "swiotlb" | wc -l
    1877
    dmesg | grep -i "swiotlb"
    ......
    [ 7060.585422] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    [ 7060.585497] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    [ 7060.585578] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    [ 7060.585703] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    [ 7060.585847] b44 0000:02:0e.0: swiotlb buffer is full (sz: 66 bytes), total 0 (slots), used 0 (slots)
    .
    Code:
    sudo lspci | grep -i Eth
    02:0e.0 Ethernet controller: Broadcom Inc. and subsidiaries BCM4401-B0 100Base-TX (rev 02)
    
    uname -a
    Linux localhost.localdomain 5.3.18-lp152.44-default #1 SMP Wed Sep 30 18:51:43 UTC 2020 (914f31e) x86_64 x86_64 x86_64 GNU/Linux
    swiotlb buffer is full - is an emergency message Or can it be ignored?

    Serg

  2. #2
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    Default Re: swiotlb buffer is full

    Hi
    Seems to be an issue with Broadcom devices? https://bugs.debian.org/cgi-bin/bugr...cgi?bug=939697
    Cheers Malcolm °¿° SUSE Knowledge Partner (Linux Counter #276890)
    SUSE SLE, openSUSE Leap/Tumbleweed (x86_64) | GNOME DE
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  3. #3

    Default Re: swiotlb buffer is full

    added these parameters to grub when starting the kernel:
    iommu=soft
    swiotlb=soft
    nopat

    result:
    no more " swiotlb buffer is full" messages in the journalctl -f

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