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    SubjectRe: [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check_sync
    On Thu, Jan 21, 2010 at 03:46:50PM -0500, Michael Breuer wrote:
    > On 1/21/2010 3:41 PM, Jarek Poplawski wrote:
    > >On Thu, Jan 21, 2010 at 02:59:19PM -0500, Michael Breuer wrote:
    > >>Test notes:
    > >>
    > >>1) Warning previously apparent on start (dma_debug check_sync) with
    > >>CONFIG_DMAR=n is gone.
    > >>2) W/o the above patch, I was getting sky2 DMAR errors and
    > >>subsequent TX hangs requiring reboot to clear. The hangs happened
    > >>after at least 12 hours of uptime, and under RX load at the time of
    > >>the hang.
    > >>3) With the above patch (and no other changes) I have not been able
    > >>to recreate the crash - the system is stable.
    > >Btw, could you remind us if during last dmar bugs jumbo frames might
    > >have been used or maybe mtu was changed, and the current test setting?
    > >
    > I've hit this with and without Jumbo frames enabled. Last couple of
    > recreations were with mtu = 1500, which is how I'm running now.
    > >>I have been following the discussion about the DMA api would suggest
    > >>that the length issue when DMAR is enabled is less innocuous than
    > >>previously believed.
    > >Actually, the last conclusions are - it's more innocuous than ever
    > >believed, and I completely agree with this (at least until the next
    > >week ;-).
    > I stand grammatically corrected.

    I didn't mean anything grammatical, sorry! (Except, it's equally
    complex ;-)

    Jarek P.


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