Re: PCI passthrough corrupting data?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, May 05, 2009 at 02:57:43PM -0400, Thor Lancelot Simon wrote:
> I have a NetBSD/amd64 (5.99.11 as of a few days ago) dom0 with
> NetBSD/i386 domUs, each of which has a passed-through Intel gigabit
> ethernet controller on wm0.  That physical interface has two vlans
> stacked on it, vlan5 and vlan3.
> 
> If configure wm0 ip4csum tcp4csum udp4csum tso4 and vlan5 (by which
> the system reaches its default gateway) the same way, I see data
> corruption on TCP streams.  For example, when I try to pkg_add from
> ftp.netbsd.org, for large .tgz files I often get MD5 checksum mismatches
> and pkg_add aborts (after a few tries it will succeed).
> 
> If I turn off tso4 and tcp4csum on wm0 and the vlans stacked on top,
> things work better but TCP reports receive checksum errors.
> 
> Is anyone else using PCI passthrough in production?  Are you seeing
> any signs of data corruption?  This system is a Dell server with Xeon
> CPUs with cache ECC and ECC memory.

How much ram does your system have ?
Is is possible to try an amd64 domU instead of i386 (I suspect issues
with >4G DMA addresses)

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           
Manuel.Bouyer%lip6.fr@localhost
     NetBSD: 26 ans d'experience feront toujours la difference
--