Re: [Xen-devel] what's maximum speed setting for xen network?

[mukesh agrawal <lists.xensource.com@xxxxxxxxxxxxxxxxxxx>]

On Apr 23, 2005 7:31 AM,  Keir Fraser wrote:

> We have no back-pressure / flow control on inter-domain networking.
> This leads to embarrassing performance for UDP when the sender and
> receiver share a CPU. The sender fills the receiver's buffers but
> continues to send even though he drops further packets (no buffer space
> at receiver) -- then the receiver gets a time slice, receives a ring's
> worth of packets -- then the sender gets to run for another time slice,
> most of which again is wasted -- and so on.
FWIW, I don't think this is the problem I'm running into. The reason being 
that I don't think the workload I'm using is heavy enough to trigger 
overflow. I'm sending 102 packets over the course of 2 seconds. Of 
these, 5 are dropped.
Assuming the ring size is given by NETIF_RX_RING_SIZE (which is defined to 
256 in io/netif.h), I'm thinking that the drops can't be attributed to 
overflow.
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