Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Technické informace stáhnout pdf (Strana 150)

136 MetaFrame Solutions Guide

Interrupts

A defective device adapter can cause an excessive number of interrupts. This

severely degrades the performance of the system because most of the processor

time is spent handling interrupts. A moderately busy server (32-bit hard disk

adapter, network card, and about 12 users) will experience an average of about

100 interrupts per second. If the number of interrupts per second increases

dramatically without a corresponding increase in system activity, it could indicate

a hardware problem. To determine if there is excessive interrupt activity, monitor

the Interrupts/sec counter under the Processor object.

Context Switches

Device drivers perform context switches to switch between user and system level

processing. A poorly-written device driver can cause the system to make a large

amount of context switches. A typical value for context switches is 500 per second

or fewer. If the number of context switches per second is greater than 500, a

device driver may have built-in critical sections that are too long. To check the

server for poorly written device drivers, monitor the Context Switches/Second

counter under the System object.

Screen Savers

Screen savers, especially “busy” ones, can use a large amount of processor

resources and, in the case of an ICA connection, network bandwidth. If you plan

to use a screen saver, use a generic one and test it on the system before you

implement it.

To determine if a screen saver is using too much processing time, run the screen

saver on the console. Log on to an ICA Client and run Performance Monitor.

Monitor the %Processor Time counter under the Processor object. Note the

demand that the screen saver puts on the processor.

Memory

The factors related to system memory that can affect performance on a MetaFrame

server include:

Memory load

The system page file, Pagefile.sys

Memory paging

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Technické informace Strana 150