[ofa-general] OFED-1.3beta IPoIB testing questions

[Shirley Ma]

Tziporet Koren <tziporet at dev.mellanox.co.il> wrote on 12/02/2007 05:30:42
AM:

> Shirley Ma wrote:
> > I just touch tested ofed-1.3 beta IPoIB. And found there was a kernel
> > parameter hw_csum being added in IPoIB. I have several questions here:
> > 1. Why not using ethtool to set up these HW_CSUM flags?
> >
> This is experimental code - Dror explained it in OFED devcon (Or sent
> you the pointer)

So this code won't be in mainline kernel.

> > 2. I haven't looked at the detailed code yet, is that possible with
this
> > flag, TCP/IP will not do CSUM for HCA which has no TCP/IP offload
support?
> > If so, then these packets should be limited to be IB network. Routing
to
> > ethernet network, the packets would be dropped. If not, I tested
IPoIB-UD,
> > why I saw 30% improvement with hw_csum set in none connectX mthca SDR
> > environment?
> Arbel HCA also support checksum offload - so you will see improvement in
> this HCA too.
> > 3. I saw switching between IPoIB-cm and IPoIB-ud corrupted interface IP

> > address (unicast address, subnet mask, broadcast address. Anybody saw
the
> > same problem?
> >
> Can you give more details? We change here between CM and UD mode all the
> time.
> What is the exact scenario you run?
>
> Tziporet
>

Yes, I will rerun my test to find the sequence to reproduce this.

thanks
Shirley
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