network performance

[Shivkumar]

Dear Sirs,

Which commands are used to find the network performance on the hpux 11i ?

What are criteria to determine if there are any bottlenecks ?

Thanks,
Shiv

[Thayanidhi]

Hi,
If you have access to HP knowledge treees (you need a valid support contract with HP to access this area) there are some network related documents. You can use nettl, glance for this purpose. There are also some packet analysers availble from internet express CD.

Regds
TT

[saju_2 · Accepted solution]

Hi shiv

Here is another content from hp-ux performance cookbook

Networking Bottlenecks:

Networking Bottleneck Recipe Ingredients:
- High (dependent on configuration) network packet or byte rates
(GBL_NET_PACKET_RATE or specific BYNETIF_IN_BYTE_RATE or
BYNETIF_OUT_BYTE_RATE > 2*average).
- Any Output Queuing (GBL_NET_OUTQUEUE > 0).
- Higher than normal number of processes or threads blocked networking
(PROC_STOP_REASON = NFS, LAN, RPC, Socket (if not idle), or
GBL_NETWORK_SUBSYSTEM_QUEUE > average).

One CPU with a high System mode or Interrupt CPU utilization while other
CPUs are mostly idle (BYCPU_CPU_INTERRUPT_UTIL > 30).
- From lanadmin, frequent incrementing of "Outbound Discards" or "Excessive
Collisions".

On some systems, you may see a high Interrupt CPU percentage on a single CPU. This
can be caused by interrupts from the NIC saturating the CPU assigned to that NIC. If yousee this symptom, you might consider adding a second NIC and possibly trunking it with Auto Port Aggregation to preserve the single IP address.

Regards
CS

[Mahesh Kumar Malik]

Hi Shiv

1. #netstat will provide details on network ststistics

2. Glance Plus will help to get info on resources utilisation including Network

3. The best tool for monitoring Netowrk Performance is "HP Openview Network Node Manager" which is availble as free trial version for 60 days.

Regards
Mahesh

[morganelan]

Important early step in troubleshooting any Network performance issues:
#How many network hops (i.e. bridges, hubs, routers, switches, etc.) do network packets traverse between the client and the server systems?
#What is the speed of each link separating these systems?
#Does your network equipment use auto-negotiation to set speed and duplex settings?
#Are your network interfaces configured for half-duplex or full-duplex mode?
#Do your switch port settings match the speed and duplex settings of your host interfaces?
#What is the maximum transmission unit (MTU) size of the links between these systems?
#If the links are using different MTU sizes, how are the packets being translated? For example, if the NFS client resides in an FDDI ring and uses an MTU size of 4352 and the NFS server uses a 100BT interface with an MTU size of 1500, how are the 4352 byte packets from the client being fragmented into 1500 byte packets for the server?
#Do packets sent from the client to the server take the same route through the network as the packets sent from the server to the client?

You can man netstat to find what you want to know about your network statistics.The traceroute(1M) tool provides a simple means of determining the path through the network taken by packets sent from one system to another.Another tool shipping with HP-UX that can simplify the process of collecting network topology information is ping(1M).The lanadmin command allows a system administrator to display many useful statistics kept by the LAN driver subsystem, regardless of the interface type.

You can try using tools such as:
ttcp:http://ftp.arl.mil/ftp/pub/ttcp
netperf:http://netperf.org

[Raj D.]

Hi Shiv ,

These are the tools needs to work with , for performance tuning and monitoring:

glance : GlancePlus system performance monitor
netstat : Checking network status and statisticks.
nettl : controls network tracing and logging.
ndd : Network tuning .
nfsstat : Network File System statistics
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Cheers,
Raj.