eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:31486278979 errors:0 dropped:14781 overruns:0 frame:0
TX packets:51999759226 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3883754810452 (3.5 TiB) TX bytes:62814059173566 (57.1 TiB)
Memory:c1300000-c1380000

ドロップしてるので・・・

/sbin/ethtool -G eth0 rx 512 tx 512
/sbin/ethtool -G eth1 rx 512 tx 512

/sbin/ethtool -G eth0 rx 1024 tx 1024
/sbin/ethtool -G eth1 rx 1024 tx 1024

/sbin/ethtool -G eth0 rx 2048 tx 2048
/sbin/ethtool -G eth1 rx 2048 tx 2048

/sbin/ethtool -G eth0 rx 4096 tx 4096
/sbin/ethtool -G eth1 rx 4096 tx 4096

/sbin/ifconfig ppp0 txqueuelen 1000

/sbin/ethtool -g eth0
/sbin/ethtool -g eth1

http://alpha-netzilla.blogspot.jp/2010/12/nic.html

vmxnet3
/sbin/ethtool -K eth0 tso off
/sbin/ethtool -K eth1 tso off