rxdrop of Virtual Machine(RHEL6) on KVM was increased.
Issue
- rxdrop of Virtual Machine(RHEL6) on KVM was increased. So our customer would like to know cause and workaround.
- The virtual machine uses Realtek virtual NIC. rxdrop of all virtual NIC(eth0, eth1 and eth2) sometimes was increased.
- lspci
00:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 20)
00:08.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 20)
00:09.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 20)
- sar
00:00:01 IFACE rxerr/s txerr/s coll/s rxdrop/s txdrop/s
10:00:01 eth2 0.00 0.00 0.00 0.00 0.00
10:10:01 eth2 0.00 0.00 0.00 0.00 0.00
10:20:01 eth2 0.00 0.00 0.00 0.00 0.00
10:30:01 eth2 0.00 0.00 0.00 0.00 0.00
10:40:01 eth2 0.00 0.00 0.00 0.00 0.00
10:50:01 eth2 0.00 0.00 0.00 *0.03* 0.00
11:00:01 eth2 0.00 0.00 0.00 0.00 0.00
11:10:01 eth2 0.00 0.00 0.00 0.00 0.00
11:20:01 eth2 0.00 0.00 0.00 0.00 0.00
11:30:01 eth2 0.00 0.00 0.00 *0.10* 0.00
11:40:01 eth2 0.00 0.00 0.00 0.00 0.00
11:50:01 eth2 0.00 0.00 0.00 0.00 0.00
Environment
- Red Hat Enterprise Linux 6.1
- kernel-2.6.32-131.0.15.el6.x86_64
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