topic Re: Discards rate for Interface lan0 in Operating System - HP-UX

Discards rate for Interface lan0

Jan vd Vlugt — Fri, 08 May 2009 07:35:39 GMT

On our virtual HP guest we receive the following error:

Discards rate for Interfacelan0 HP PCI 1000Base-T Release B.11.23.0812 is 6.341%, threshold value for this monitor is 1%. Interface description is 'lan0 HP PCI 1000Base-T Release B.11.23.0812' and index is 1. Circuit ID not configured.

How to fix this error?

Kind regards

Jan

Re: Discards rate for Interface lan0

rick jones — Mon, 11 May 2009 16:22:40 GMT

What this means is that there is traffic being generated faster than it can be sent-out the interface. It may be possible to increase the depth of the transmit queue, but that will only help if the nature of these discards is they are from occasionally bursts. In the abstract, a sustained oversubscription of the interface has two basic solutions - get a faster interface, or generate less traffic.

If this is an interface in a virtual guest, perhaps giving it more CPU cycles will help, but that is a longshot - I would think the host/hypervisor/callitwhatyouwill - would need to pull packets faster. So, if this guest is sharing a physical interface with other guests, perhaps adding additional physical interfaces and spreading the guests across them will help.

Re: Discards rate for Interface lan0

Steven E. Protter — Mon, 11 May 2009 17:31:06 GMT

Shalom Jan,

1000Mbps NIC cards must be configured auto negotiate to work right.

Therefore any problems you encounter are either network hardware, or switch configuration, usually the later, the switch port.

SEP