Re: [Xen-devel] xennet: skb rides the rocket: 20 slots

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jan 08, 2013 at 08:57:19PM +0000, James Harper wrote:
> > > If netback complains about "Too many frags", then it should be
> > > MAX_SKB_FRAGS limitation in netback results in dropping packets in
> > > netfront. It is possible that other netfronts(windows?) also hit this.
> > 
> > It's very possible. I rather suspect that non-Linux frontends have
> > workarounds (e.g. manual resegmenting etc) for this case.
> > 
> 
> GPLPV gathers fragments together if there are too many. Mostly this is just 
> the header but there could be a whole lot of copying going on in a worst-case 
> packet.
> 
> It would be nice if a max-frags value was written to xenstore... do different 
> backends (solaris? Bsd?) have different requirements? Or maybe that's already 
> been discussed - I haven't followed this thread closely.

I think we discussed it last year as something that should be exported via 
XenBus. But never
got down to figure out what it entails in - I think. This was pre-holidays.
> 
> James

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