Poor performance on Procurve 2848

[Robert Van De Weghe]

I have been working with small networks for a few years but recently one of the companies I do work for has increased in size. I currently have a 2650 and 2848 stacked.
Not having dealt with managed switches very much I find myself in need of some assistance.
I should mention we have 100% Apple user base. G5 towers, Powerbooks and eMacs.
Through testing I have noticed a large performance difference when copying files from the server (connected to 2848) by machines connected to the 2848. A folder holding 300 MB of data takes 10-12 minutes on the 2848, but if I switch the same machine to a port connected to the 2650 the data transfers in less than a minute. This issue is re-creatable on multiple machines. It only happens with machines having 100T NICs not the G5 or G4's with 1000T NICs. I have also recreated the issue with a PowerBook G4 directly connected to the 2848 on multiple ports. I have tried setting both the PowerBook and 2848 to static 100T/ full duplex to see if there was an issue with auto negociation but the performance issue still exists.
If anyone has some idea how to next approach this I would appreciate the assistance.

Thank you

[Jason Scott]

This doesn't really help with your problem, but we've got 2 2848s in our server cabinets with servers multi-homed between them. Each 2848 connects back to a 5308 and 9308 via gbit fibre and we've noticed no performance issues.

Are your switches also doing routing?

[Matt Hobbs · Accepted solution]

Try using the 'qos-passthrough-mode' command on the 2800's, it should make a significant difference.

[Robert Van De Weghe]

No IP routing
I will try the qos-passthrough-mode command

Thank you for the timely advice

[Robert Van De Weghe]

Great

The qos-passthrough-mode command solved the problem.
I guess if I had done a little more digging I would have found the buffer issue mentioned in a couple of other threads.

Thanks again

[Les Ligetfalvy]

It also helps not to mix speeds on that model. Put only gig NICs on it and relegate it to a closet that doesn't matter.

I have a 2848 that I had big plans for and now it mostly collects dust.