netdev - Packet dropps in virtual tap interface

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Date:	Tue, 24 Feb 2015 10:18:59 +0300
From:	Michael Kazakov <michael@...athonbet.ru>
To:	netdev@...r.kernel.org
Subject: Packet dropps in virtual tap interface

Hello. We use our highly load system in OpenStack environment. And faced
with serious problems in network highload guests. At a relatively high
CPU load of hypervisor (40-60%) virtual network interfaces of this
guests starts to droppart of the packets. We use for virtualization
qemu-kvm with vhost driver: "... -netdev
tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:86:67:7b,bus=pci.0,addr=0x3...".

The problem can be seen with the ifconfig utility:
tape4009073-0b Link encap:Ethernet  HWaddr fe:16:3e:86:67:7b
           inet6 addr: fe80::fc16:3eff:fe86:677b/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:1587622634 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1484106438 errors:0 dropped:460259 overruns:0
carrier:0
           collisions:0 txqueuelen:500
           RX bytes:877878711500 (877.8 GB)  TX bytes:3071846828531 (3.0
TB)

Could you do a little look at our problem and give advice which
direction to continue our investigation?

-- 
С уважением,
Михаил Казаков
Старший системный администратор
OOO "СПЛАТ"

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