Re: Cisco 3750G stack and slow network troughput to certain NICs
I believe there have been several posts about throughput issues with 3750 switches (other forums). I found a bug, CSCeg29704 (fixed in your release, I believe), that described an issue with poor TCP performance caused by poor default egress settings when QoS enabled. Even with your release, I'm unsure default settings are ideal for all traffic types, with or w/o QoS enabled, since I also recall(?) another issue when ingress is gig and egress is 100.
What you might do is check whether there appears to be a high packet drop rate within the switch, and if so, you might try some manual tuning to see if that rate can be reduced. Your IOS is relatively recent, but you could also try a newer release.
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