Re: DMA failures on AMD64 with 4 GB RAM

From: Søren Schmidt (sos_at_deepcore.dk)
Date: 11/28/05

  • Next message: Gavin Atkinson: "Re: Building new Athlon AMD64 Socket 939 or 940 machine" 
    Date: Mon, 28 Nov 2005 15:23:38 +0100
To: Attila Nagy <bra@fsn.hu>

    Attila Nagy wrote:
    > Hello,
    >
    > There is a problem with recent ATA drivers on (at least) AMD64 with 4 GB
    > of RAM, which can be triggered by synchronizing a geom mirror provider
    > to another one (or generally a bigger disk I/O, I guess).
    >
    > The machine dies instantly with the following:
    > GEOM_MIRROR: Device hars: rebuilding provider ad6.
    > ad6: setting up DMA failed
    > ad6: setting up DMA failed
    >
    > This is true either on RELENG_6 and on HEAD as of today.
    >
    > There are two workarounds:
    > - use the ata driver from RELENG_6 which is not older than 2005.10.08
    > - set hw.physmem smaller than 4G
    >
    > Are there any chances to resolve this issue?
    >
    > Thank you.
    >
    > ps: there was some discussion about this:
    > http://marc.theaimsgroup.com/?l=freebsd-amd64&m=113034973432742&w=2
    > where Søren said it might be busdma, not the ata driver and Scott
    > promised to look into that.

    The resolution was that busdma doesn't work as advertised in the man
    page, and that scottl would look into it.

    -Søren
    >

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