Re: [Xen-devel] NAPI rescheduling and the delay caused by it

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

On Mon, 2013-12-09 at 17:14 -0800, Eric Dumazet wrote:

> > I found another suspect however: my grant mapping patches do the
> > unmapping from the NAPI instance where otherwise we receive the
> > packets from the guest. But this means we call napi_schedule from the
> > zerocopy callback, which can be run by anyone who free up that skb,
> > including an another VIF's RX thread (which actually does the transmit
> > TO the guest). I guess that might be bad.
> 
> Same problem : napi_schedule() is meant to be used from interrupt
> context.
> 

Check commit ec13ee80145ccb95b00e6e610044bbd94a170051
for example.




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