# [OmniOS-discuss] mpt_sas & ixgbe kernel buffer alloc failures

Dan McDonald danmcd at omniti.com
Fri Jan 30 20:34:06 UTC 2015

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    > On Jan 30, 2015, at 2:46 PM, Marion Hakanson <hakansom at ohsu.edu> wrote:
    >
    > Here's a "::memstat" dump, after the dma memory allocation errors
    > have started showing up:
    >
    > # echo "::memstat" | mdb -k
    > Page Summary                Pages                MB  %Tot
    > ------------     ----------------  ----------------  ----
    > Kernel                   25477565             99521   76%
    > ZFS File Data             6275294             24512   19%
    > Anon                        19707                76    0%
    > Exec and libs                 724                 2    0%
    > Page cache                   4292                16    0%
    > Free (cachelist)             7535                29    0%
    > Free (freelist)           1747133              6824    5%
    >
    > Total                    33532250            130985
    > Physical                 33532249            130985
    > #
    >
    >
    > Is it just me, or is that an awful lot of kernel memory in use?

    That does seem to be a lot.

    What does ::kmausers say?  (It may be a lot of output...)

    Also, is it possible for you to:

    1.) Put this line in /etc/system:

    set kmem_flags=0xf

    2.) Reboot your system.

    3.) When you encounter this situation again (it may happen sooner with memory debugging enabled), utter "reboot -d" to get a kernel core dump for memory leak analysis?

    Thanks,
    Dan

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