IBM SC41-5420-04 Merge Host Table Performance, Running TCP/IP Only Performance Considerations

Note: If you configure your 100 Mbps ethernet line for TCPONLY, all IOP assist

functions are disabled.

TCP/IP-assist functions that are available on frame relay IOAs are:

v#2699 Two-Line WAN IOA

v#2720 PCI WAN/Twinaxial IOA

v#2721 PCI Two-Line WAN IOA

Communications restrictions apply if any of the following communication functions are required when using the frame relay IOAs, as listed above:

vX.25, Frame Relay, or IPX Protocol

vSDLC protocol, if used to connect to more than 64 remote sites

vCommunications line speeds greater than 64 Kbps and up to 2.048 Mbps for the synchronous data link control (SDLC) or frame relay protocols (bisync is always limited to a maximum of 64 Kbps)

vCommunications line speeds greater than 64 Kbps and up to 640Kbps for X.25

Merge Host Table Performance

You can use the following data to help you plan for and anticipate performance

when merging host tables. The data represents averages of measurements that are

taken. The actual time required on your server will be different.

Three cases were measured:

vSmall merge—merge a 250-record file into the local host table that currently has 50 entries

vMedium merge—merge a 2000-record file into the local host table that currently has 50 entries

vLarge merge—merge a 5000-record file into the local host table that currently has 50 entries.

The results of this test are shown in Table 7.

Table 7. Merge Host Table Performance
Number of records		Elapsed time
merged	Record format	(min:sec)	CPU percent
250	*AIX	0:42	43.7
2000	*NIC	5:38	49.4
5000	*NIC	13:54	48.6

This data equates to about 6 records per second and about .07-.08 processing unit seconds per record.

Running TCP/IP Only: Performance Considerations
Certain configurations of 2838 - 10/100 Mbps Ethernet cards allow you to run the
IOP with only TCP/IP instead of all protocols for better performance. You need a
2838 Ethernet card with either:
v 2810	IOP
v 2809	IOP (the 2838 must be the only input/output adapter (IOA)IOA on the
IOP)

Chapter 3. TCP/IP Performance 73