使用OpenVPN的可能tun0瓶颈

我有dedikuoti.lt的Debian 8.0 VPS，我想用它作为我的Windows 10 PC的 VPN。

我已经使用这个脚本安装了OpenVPN：

wget http://git.io/vpn --no-check-certificate -O openvpn-install.sh; chmod +x openvpn-install.sh; ./openvpn-install.sh

协议：UDP
港口：11949

服务器configuration文件：

 port 11949 proto udp dev tun sndbuf 222222 rcvbuf 222222 ca ca.crt cert server.crt key server.key dh dh.pem auth SHA512 tls-auth ta.key 0 topology subnet server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 212.24.109.143" push "dhcp-option DNS 212.24.105.143" keepalive 10 120 cipher AES-256-CBC comp-lzo user nobody group nogroup persist-key persist-tun status openvpn-status.log verb 3 crl-verify crl.pem

客户端configuration文件：

 client dev tun proto udp sndbuf 222222 rcvbuf 222222 remote 194.135.93.22 11949 resolv-retry infinite nobind persist-key persist-tun remote-cert-tls server auth SHA512 cipher AES-256-CBC comp-lzo setenv opt block-outside-dns key-direction 1 verb 3 <ca> -----BEGIN CERTIFICATE----- ... ... ...

我有家庭和VPN服务器之间的100 Mbps，但不知何故VPN限制到约30 Mbps的速度（通过从Ubuntu镜像使用HTTP下载ISO文件testing）

在做了一些瓶颈研究之后，我发现：

请看这个附件的输出

VPN Server有3个虚拟CPU（基于Linux VZ容器的虚拟化），具有以下限制：

 Version: 2.5 uid resource held maxheld barrier limit failcnt 12670: kmemsize 37922992 384258048 9223372036854775807 9223372036854775807 0 lockedpages 4127 10480 9223372036854775807 9223372036854775807 0 privvmpages 230153 311377 9223372036854775807 9223372036854775807 0 shmpages 35894 35908 9223372036854775807 9223372036854775807 0 dummy 0 0 9223372036854775807 9223372036854775807 0 numproc 66 150 4096 4096 0 physpages 90924 159961 0 393216 0 vmguarpages 0 0 9223372036854775807 9223372036854775807 0 oomguarpages 43687 44127 9223372036854775807 9223372036854775807 0 numtcpsock 6 24 8192 8192 0 numflock 38 61 4096 4096 0 numpty 1 2 256 256 0 numsiginfo 0 63 1024 1024 0 tcpsndbuf 120032 569376 9223372036854775807 9223372036854775807 0 tcprcvbuf 98304 393216 9223372036854775807 9223372036854775807 0 othersockbuf 180336 359880 9223372036854775807 9223372036854775807 0 dgramrcvbuf 0 353160 9223372036854775807 9223372036854775807 0 numothersock 131 164 8192 8192 0 dcachesize 24591116 367046187 9223372036854775807 9223372036854775807 0 numfile 1053 1390 9223372036854775807 9223372036854775807 0 dummy 0 0 9223372036854775807 9223372036854775807 0 dummy 0 0 9223372036854775807 9223372036854775807 0 dummy 0 0 9223372036854775807 9223372036854775807 0 numiptent 28 28 4096 4096 0

有没有人有一个想法，为什么这个限制发生？以及如何解决这个问题？

谢谢！