[Bug 1423631] Re: tap interface drops many packets on highload systems

[Michael Kazakov]

I found the cause of the problem.
The tap interface of a instance has small  tx  length 500 packets. At a high network load (15-25 Kpps) and high CPU load on a guest some times queue overflows and the tap interface start drop network packages. I think that queue overflow occurs in moments of micro friezes (<1000ms) of a virtual machine.  I solved this problem by increasing the tx_queue up to 10000.

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Title:
  tap interface drops many packets on highload systems

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