Date: Wed, 10 Sep 2014 09:42:46 +1200 From: mailinglists@debank.tv To: freebsd-net@freebsd.org Subject: Performance problem with slow link behind fast gateway Message-ID: <a5d07d35c0e3f423e6782410a175fcd2@debank.tv>
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All,
I'm seeing some performance problems with a slowish VPN connection
behind a fast gateway, the setup looks like this:
|----------------------------------|
|-----------------------------|
|client (zandbak) (DSL connection)| ---- 'VPN tunnel' ----- |Gateway
(vps) using NAT on 1G|------ 'Internet'
|----------------------------------|
|-----------------------------|
Transfers from the gateway to the client are reasonably fast (easily
within usable range for me):
root@zandbak:/usr/home/rob # scp rob@gateway:test_file ./
test_file
100% 10MB 445.2KB/s 00:23
Transfers from the internet to the gateway are fast:
root@vps:/usr/home/rob # fetch -4
"http://149.20.53.23/pub/FreeBSD/releases/amd64/amd64/ISO-IMAGES/10.0/FreeBSD-10.0-RELEASE-amd64-bootonly.iso"
FreeBSD-10.0-RELEASE-amd64-bootonly.iso 100% of 209 MB 10 MBps
00m20s
But transfers from the client to the internet through the tunnel are
showing a very degraded connection speed, the speed jumps up and down
but averages at around 20kBps:
root@zandbak:/usr/home/rob # fetch
"http://149.20.53.23/pub/FreeBSD/ISO-IMAGES-amd64/10.0/FreeBSD-10.0-RELEASE-amd64-bootonly.iso"
FreeBSD-10.0-RELEASE-amd64-bootonly.iso 0% of 209 MB 8275 Bps
07h27m
I've tried to eliminate some variables:
-VPN: tinc as a L2 VPN and openVPN as a L3 VPN, results are the same
-NAT: pf and ipfw, results are the same
I suspect that there's a problem with the fast link receiving too much
data and once the buffers are full dropping packets although I'm not
sure if this is actually the problem.
My question is: how can I debug this issue?
Below some system information, I can supply more info if needed
Thanks!
Rob Evers
System info:
Gateway: This is a VPS on KVM
root@vps:/usr/home/rob # uname -a
FreeBSD vps.debank.tv 10.0-STABLE FreeBSD 10.0-STABLE #5 r268727M: Wed
Jul 16 13:17:24 NZST 2014
root@vps.debank.tv:/usr/obj/usr/src/sys/GENERIC amd64
root@vps:/usr/home/rob # ifconfig vtnet0
vtnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=6c00ab<RXCSUM,TXCSUM,VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
ether 00:16:3c:55:17:b9
inet 192.227.xxx.xxx netmask 0xffffff00 broadcast
192.227.xxx.xxx
inet6 fe80::216:3cff:fe55:17b9%vtnet0 prefixlen 64 scopeid 0x1
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: Ethernet 10Gbase-T <full-duplex>
status: active
root@vps:/usr/home/rob # ifconfig tap0
tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=80000<LINKSTATE>
ether 00:bd:61:01:00:00
inet6 fd7c:3e16:580b:4ccf::50 prefixlen 64
inet6 fe80::2bd:61ff:fe01:0%tap0 prefixlen 64 scopeid 0x4
inet 172.16.143.50 netmask 0xffffff00 broadcast 172.16.143.255
nd6 options=61<PERFORMNUD,AUTO_LINKLOCAL,NO_RADR>
media: Ethernet autoselect
status: active
Opened by PID 61485
Client: This is a VM on bhyve
root@zandbak:/usr/home/rob # uname -a
FreeBSD zandbak 10.0-RELEASE-p7 FreeBSD 10.0-RELEASE-p7 #0: Tue Jul 8
06:37:44 UTC 2014
root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
root@zandbak:/usr/home/rob # ifconfig vtnet0
vtnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
metric 0 mtu 1500
options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
ether 52:54:00:13:fd:78
inet 192.168.1.129 netmask 0xffffff00 broadcast 192.168.1.255
inet6 fe80::5054:ff:fe13:fd78%vtnet0 prefixlen 64 scopeid 0x1
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet 10Gbase-T <full-duplex>
status: active
root@zandbak:/usr/home/rob # ifconfig tap0
tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=80000<LINKSTATE>
ether 00:bd:3d:94:05:00
inet 172.16.143.55 netmask 0xffffff00 broadcast 172.16.143.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect
status: active
Opened by PID 1411
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