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traffic within 3750 slow, but fast outside of it

I have 2 new 3750g devices in a small environment.  switch1 acts as our collapsed core and has ip routing enabled, and is connected to a ASA 5510. There are 3 HP l2 switches connected to switch1 as well.   switch2 is simply a server switch.  switch1 and switch2 have a 2port etherchannel between them, and a vlan trunk carrying 4 vlan's. 

Issue:  traffic between any 2 hosts on switch2 (same vlan) are slow. (average 300Mbits/sec)  If I move one of those hosts to switch1, speeds increase by 3 times.  (average 900 Mbits/sec).  Additionally, traffic between any 2 hosts on switch1 are quick. testing is done with iperf as well as timing 1gig file transfers.

I don't see any errors or drops anywhere, and there are no other symptoms other than slow transfer beteween hosts on switch2.   Any ideas where to start?  I just got 2 more of these 3750's to put in a 2nd site that we have, put a quick configuration on them, and have the same result.  Other than switch1 having ip routing enabled, the configs are pretty much identical.

thanks

Matt

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Community Member

traffic within 3750 slow, but fast outside of it

running ipbase 12.2(55) se5

Community Member

Re: traffic within 3750 slow, but fast outside of it

Make that se2 not se5. Qos disabled. Cpu utilization is low. Any ideas?

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