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



On 10/12/13 01:14, Eric Dumazet wrote:
On Mon, 2013-12-09 at 23:39 +0000, Zoltan Kiss 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.

Indeed, avoiding napi_schedule seems to solve the issue. Thanks for the advices!

Zoli

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