Re: NFS writes being corrupted?

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Fri, Aug 21, 2015 at 04:02:29PM -0300, Jared McNeill wrote:
> On Sun, 9 Aug 2015, Jeff Rizzo wrote:
> 
> >This would seem to indicate a problem with the particular interface
> >(awge0), perhaps specific to the odroid-c1, as opposed to some l2 cache
> >controller issue, which is kind of where I was leaning before.  However,
> >my banana pi has awge0 as well, but does not exhibit this corruption.
> 
> The following awge patch fixes it for me:
[...]
>  	bus_dmamap_sync(sc->sc_dmat, map, 0, map->dm_mapsize,
> -	    BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
> +	    BUS_DMASYNC_PREWRITE);

Whoah.  Why?

Thor