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114688
2017 Sep 28
9
[PATCH net-next] vhost_net: do not stall on zerocopy depletion
From: Willem de Bruijn <willemb at google.com>
Vhost-net has a hard limit on the number of zerocopy skbs in flight.
When reached, transmission stalls. Stalls cause latency, as well as
head-of-line blocking of other flows that do not use zerocopy.
Instead of stalling, revert to copy-based transmission.
Tested by sending two udp flows from guest to host, one with payload
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