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The time for disk heads to move is an eternity to the kernel, some hundreds of times slower than context switching times An even worse situation can arise with the virtual memory system If a host begins paging to disk, because it is low on memory, then there can be simultaneous contention both for memory and for disk Imagine, for instance, that there are many processes, each loading files into memory, when there is no free RAM To use RAM, some has to be freed by paging to disk; but the disk is already busy seeking files To load a file, memory has to be freed, but memory can't be freed until the disk is free to page, this drags the heads to another partition, then back again.. and so on.

3. Select Print Directly to a Network Printer. Click Next and you are prompted for the protocol used for printing to this network printer (see Figure 9-10).

(12.9)

Figure 9-10: Printing protocol Direct Printing Sends the printing job in raw form. This is usually safe for most modern network printers. LPD Protocol If your network printer understands the Unix LPD protocol, then you can use this option. IPP Printing Sends print jobs to the printer with the Internet Printing Protocol. 4. Select the direct printing protocol. Once selected, press the Next button.

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This nightmare brings the system to a virtual standstill as it fights both over free RAM and disk head placement The system spends more time juggling its resources than it does performing real work, ie the overhead to work ratio blows up The only cure for thrashing is to increase memory, or reduce the number of processes contending for resources..

5. You are prompted for the IP address of the network printer you wish to connect to explicitly, or you can attempt to scan for available network printers on your network with the Lookup button. 6. If your printer has successfully been detected on the network, you can press the Test Socket Access button to see if the printer accepts print jobs before continuing. 7. Click the Next button to move on to configuring the printer name, description, and location (see Figure 9-11). These are free-form strings that will help you identify the printer from your applications. Two options of note are Do Local Filtering and Automatically Propose Multiple Queues. Do Local Filtering Relevant when the remote printer you are connecting to is not intelligent enough to prepare a print job before putting ink to paper. In this case, to take the burden away from your printer, you can do the preparation of page layout and so forth on your local machine and then send the finished, prepared job to the printer. Automatically Propose Multiple Queues Used when the system that hosts your printer uses different queues to reflect different printer configuration options, such as black and white printing, color printing, and so on. The available printer queues are usually contingent on those supported and created by the printer driver. As we are doing local filtering in this example, we are unable to print a test page at this point because we need to set up our specific printer model. If your printer is intelligent enough to handle raw print jobs, you can attempt to print a test page. Otherwise, you may find your printer printing out garbage.

A final point to mention in connection with disks is to do with standards. Disk transfer rates are limited by the protocols and hardware of the disk interfaces. This applies to the interfaces in the computer and to the interfaces in the disks. Most serious performance systems will use SCSI disks, for their speed (see section 2.7). However, there are many versions of the SCSI disk design. If we mix version numbers, the SCSI bus will default to the lowest common denominator, i.e. if we mix slow disks with fast disks, then all the disks will work slowly. If one needs to support legacy disks together with new disks, then it pays to collect like disks with a special host for each type, or alternatively, buy a second disk controller rather than to mix disks on the same controller. 7.7.3 Software Tuning and Kernel Configuration

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