DEFINING THE PRINTER TO THE HOST: TCP/IP ATTACHMENTE-16 XEROX DOCUPRINT 96/4635/180 IPS INSTALLATION PLANNING GUIDECorrecting for printer performance issues – MVSShould you notice any printer performance problems—e.g., through-put speed degradation, check the areas listed in the following table.Table E-11.Components to check for printer performanceproblemsMVS On the MVS system, ensure that both the PSF and TCP/IPaddress spaces are receiving a high level of service, are at a highdispatching priority, and their datasets and the JES2 spooldatasets are on DASD volumes that have low competing activityfrom other applications and from other DASD volumes on thesame path.Printer Ensure that the Maximum Transmission Unit size (MTU) is aslarge as possible. A small MTU size increases the number ofpackets that are transmitted, allowing greater chances ofdegradation throughout the network. Increasing the MTU size inboth TCP/IP for MVS and in the IPS printer may improve printerperformance.LAN If the printer is on a LAN that also has a large number of otherdevices attached to it, the high levels of traffic on the LAN cancause printer speed degradation. Consider moving the printer toa LAN that does not have so much activity on it.LAN-to-hostattachmentIf the speed of the link connecting the LAN with the printerattached to the MVS system is slow, this could be a bottleneck.This could be a concern with any configuration in which the LAN-attached controller (i.e., 3745, 3172, or 3174) is not directlychannel-attached to the host running PSF. This could occur in aRemote LAN configuration as discussed in the NetworkConfigurations section, earlier in this chapter. Review yournetwork configuration diagrams to look for any potentialbottlenecks.