Re: [Xen-devel] network_alloc_rx_buffers panic

["Mark A. Williamson" <mark.williamson@xxxxxxxxxxxx>]

> I'm not clear on what is happening here.   Are the domains changing size?

Yes they are (by a small, bounded amount).  As you may well know, incoming 
network packets are received into buffers in the backend and those buffers 
are then page-flipped into the appropriate destination domain.  Therefore, 
domains with virtual ethernet interfaces must return pages to Xen (by 
reducing their reservation) in return for the pages that are flipped in.

The net effect is that both backend and frontend domains vary in size by a 
small, bounded amount and that copies on the receive path are avoided.

> Which memory reservation is being reduced, xen0 or xenU?

XenU is reducing its reservation to give receive buffers to the backend driver 
in Xen0.

HTH,
Mark

> All the domains are v2.6.8.1, changeset 1.1331 from  Tuesday.
>
> David
>
>
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