3750 slow local transfert

[dufour001]

Hello,

we have a stack of 3 cisco 3750 switch.

and lot of CE500, each connected to a port of the 3750.

All our servers are directly connected to 3750.

We have 4 VLANs, tested on the same VLAN (10)

We have problem with slow network performance within the 3750.

We make some test between a PC and a NAS with one bif file.

- PC and NAS directly connected to the 3750 (1000 Mb/s connection): transfert speed : 4 Mo/s !!!

- PC connected to a CE500 (100 Mb/s) wich is connected to 3750, NAS connected to 3750 : Speed : 10 Mo/s

- PC and NAS connected to CE500 : speed = 12 Mo/s

so there is a problem on 3750, the pseed should be higher than all other test ...

I don't see any error on the port.

CPU usage is ok, memory also

Above, the config of the ports and a sho of the interface of NAS.

Where is my problem ?

thx

interface GigabitEthernet2/0/10
 switchport access vlan 10
 switchport mode access
 srr-queue bandwidth share 10 10 60 20
 srr-queue bandwidth shape  10  0  0  0
 queue-set 2
 mls qos trust cos
 auto qos voip trust
 spanning-tree portfast

GigabitEthernet2/0/10
  Hardware is Gigabit Ethernet, address is 001e.f6fc.1f0a (bia 001e.f6fc.1f0a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 36/255, rxload 2/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:08:14, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 90000 bits/sec, 66 packets/sec
  5 minute output rate 1421000 bits/sec, 102 packets/sec
     1002755695 packets input, 4198445165 bytes, 0 no buffer
     Received 2031 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 36 multicast, 0 pause input
     0 input packets with dribble condition detected
     1177751905 packets output, 1694142531 bytes, 0 underruns

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

No interface drops?

What IOS and what model 3750?

[dufour001]

Assuming the previous screen, no drops :

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

IOs version :

Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1)

and my stack

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   12     WS-C3750G-12S      12.2(25)SEE2            C3750-IPBASE-M
     2   28     WS-C3750G-24PS     12.2(25)SEE2            C3750-IPBASE-M
     3   24     WS-C3750G-24T      12.2(25)SEE2            C3750-IPBASE-M

(tested on switch 2)

thx

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

That's a rather old IOS, do you have a service contract so that you could upgrade to a newer IOS?

[q-le]

Hi Joseph,

We have a similar issues and our 3750 IOS is 12.2(55)SE6.

What is the recommend NEWER IOS?

Thanks

Peter

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Your interfaces also register no drops?

12.2(55)SE9.

[q-le]

yes, no drop in the interface

will upgrade to this IOS and see how it go.

Thanks

Peter

[rothomas2]

I wouldnt do testing with a PC and a NAS. At some point your HDD write/read speed is going to become a bootle neck.

When you want to test real ip throughput use something like iperf. We use iperf to certify 10gigs links. Its super effective, and standard.

Get two laptops with gig interfaces connected back to back with a crosscable run iperf (-s) on one side, and iperf client on the other side and you will see 980mbps if your driver is good. Do the same test over your SW with straight cables to test for througput.

Once you lern how to use iperf, you will love it and use nothing else.

[dufour001]

I have upgraded IOs on the stack.

Now, the interface display dropped packets.

So I increased the queue buffer and now I can transfer my file to an average of 14 MB/s (in place of 4).

now, I don't have any dropped packet on interface

So it's much better.

But 14MB is approx 112 Mb/s, and I'm on a Gigabit connexion

So what can can I do to have better transfert rate ?

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

So with your increased buffers, there's no drops at all now?

What protocol is being used for the file transfer?

What are the end hosts?

[dufour001]

Yes, no more drops.

I use standard Windows copy (Win7->Win7, or Win7->Server 2003/2008)

I make some try, and when I change the srr like this : I can transfer with an average between 50 and 100 Mo/s

 srr-queue bandwidth share 1 75 25 5
 srr-queue bandwidth shape 2  0  0  0