DMA failures on AMD64 with 4 GB RAM
Søren Schmidt
sos at deepcore.dk
Mon Nov 28 14:23:49 GMT 2005
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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