Re: [Xen-devel] [PATCH RFC] tcp: Allow sk_wmem_alloc to exceed sysctl_tcp_limit_output_bytes

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

On Wed, 2015-04-15 at 15:36 +0100, Ian Campbell wrote:
> On Wed, 2015-04-15 at 15:19 +0100, George Dunlap wrote:
> > On Mon, Apr 13, 2015 at 4:03 PM, Malcolm Crossley
> [...]
> > > From a networking point of view, the backend is a switch. Is it OK to
> > > consider the packet to have been transmitted from the guest point of
> > > view once the backend is aware of the packet?
> > >
> > > This would help justify the skb_orphan() in the frontend.
> > 
> > This sounds sensible to me, particularly if virtio_net is already doing it.
> 
> I also find Malcolm's argument above pretty compelling.

Yes, and then you'll have to help the virtio ongoing effort trying to
get rid of this skb_orphan()

Basically you're adding head of line blocking, as a single flow is able
to fill your queue.



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