3945 won't go over 100Mbps

[rafpd2215]

I have a 3945 here for my home lab. I have noticed that with my ISP WAN connected to gi0/2 and a very basic config I can't get more than about 96Mbps internet speedtest throughput on my PC. I've tried the Ether switch module with my PC on it and also a 3750x hung off gi0/1 neither make any difference and all are Gigabit ports. I have checked speed, duplex, everything to no avail.

If I unplug the same exact ISP WAN connection from the 3945 and plug it into my Meraki MX-64 with my same exact PC, I get 150Mbps which is my rated ISP bandwidth. 

The 3945 should be doing well better than that from what I read. I don't understand what could be the issue. It's a lab and has no utilization. CPU is also minimal to nothing.

C3945#sh int gi0/2
GigabitEthernet0/2 is up, line protocol is up
Hardware is PQ3_TSEC, address is 0078.887d.3b82 (bia 0078.887d.3b82)
Description: WAN
Internet address is OMITTED
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1Gbps, media type is RJ45
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/184/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 31000 bits/sec, 48 packets/sec
5 minute output rate 9000 bits/sec, 9 packets/sec
1975049 packets input, 499630732 bytes, 0 no buffer
Received 1547225 broadcasts (0 IP multicasts)
0 runts, 0 giants, 5 throttles
1 input errors, 0 CRC, 0 frame, 1 overrun, 0 ignored
0 watchdog, 1050 multicast, 0 pause input
338072 packets output, 138543068 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
1050 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

C3945#sh ip int gi0/2
GigabitEthernet0/2 is up, line protocol is up
Internet address is OMITTED
Broadcast address is 255.255.255.255
Address determined by DHCP
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Flow switching is disabled
IP CEF switching is enabled
IP CEF switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, CEF
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Policy routing is disabled
Network address translation is enabled, interface in domain outside
BGP Policy Mapping is disabled
Input features: Common Flow Table, Stateful Inspection, Virtual Fragment Reassembly, Virtual Fragment Reassembly After IPSec Decryption, NAT Outside, MCI Check
Output features: Post-routing NAT Outside, Common Flow Table, Stateful Inspection, NAT ALG proxy
IPv4 WCCP Redirect outbound is disabled
IPv4 WCCP Redirect inbound is disabled
IPv4 WCCP Redirect exclude is disabled
C3945#

#sh proc cpu

CPU utilization for five seconds: 1%/0%; one minute: 1%; five minutes: 1%

Any ideas what could be going on?

Thanks!

[balaji.bandi]

can you show us full configuration and show the version of the device. May be worth tweak MTU and MSS Settings ? what is the connection from ISP DSL ? or Etherent hand over ?

If I unplug the same exact ISP WAN connection from the 3945 and plug it into my Meraki MX-64 with my same exact PC, I get 150Mbps which is my rated ISP bandwidth. 

You should be able to get around same speed what you get on Meraki.

[rafpd2215]

Sure see attached.

The handoff is ethernet from their cable modem direct into 3945.

[paul driver]

Hello
Throughput is possibly restricted by licence.-post the output of the following commands into  file and attach to your post:
sh logging
sh licence feature 
sh licence status
sh licence right-to-use
sh platform hardware throughout 

[rafpd2215]

I didnt think the 3945 had any kind of throughput license? I thought that was on the new ASR 4000 series? I have read about the 3945 hsec license throughput issues but thats related to encryption, which isnt happening? 

requested commands attached

[balaji.bandi]

I do see you have License as below  may be worth also posting as suggested @paul

[Joseph W. Doherty · Accepted solution]

Internal side connection stats are?

You mention an Ethernet module.  If using on router for internal Ethernet connections, what's the module?

Possibly of some interest . . .

Input queue: 0/75/184/0 (size/max/drops/flushes); Total output drops: 0

Unusual to be seeing input queue drops.

[rafpd2215]

You got it Joseph! Turns out there is an issue with my PC. Hard wired to the 3945 service module my pc is only negotiating at 100Mbps. Even though the NIC is gigabit capable its not negotiating at it for some reason. It appears to be some form of a driver issue. Even hard coding the NIC or the switch port to 1000 wont allow the connection to come up. I think what happened is when plugged into the MX-64 it was bringing up the WLAN and going across that to give me my full advertised speed on the PC because going back and checking now the PC hardwired even to the MX-64 port is only negotiating at 100 but connected to the MX-64 SSID as well.

So looking at the switch port module interface stats was what showed I was only negotiating at 100. I guess I should of checked the PC/switchport side a little better! Grabbing a completely different PC with wireless turned off and plugged into the 3945 negotiated at 1000 fine and speed test is spot on 150Mbps as expected. So not a 3945 issue at all but a PC issue!

Thanks everyone for your help!

[Joseph W. Doherty]

When I saw my posting was marked as a solution, I thought "huh?", as I my post was mostly looking for more information.  Reading your follow-up, though, I can see how much question(s) help lead you to the solution, of which, I was very glad to read you found (and posted) the cause.

[paul driver]

Well Spotted Joesph +5