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The sharing of resources between many users and processes is what networking is about. The competition for resources between several tasks leads to another performance issue. Principle 40 (Contention/competition) When two processes compete for a resource, performance can be dramatically reduced as the processes fight over the right to use the resource. This is called contention. The benefits of sharing have to be weighed against the pitfalls. Contention could almost be called a strategy in some situations, since there exist technologies for avoiding contention altogether. For example, Ethernet technology allows contention to take place, whereas Token Ring technology avoids it. We shall not go into the arguments for and against contention. Suffice it to say that many widely used technologies experience this problem. Ethernet collisions: Ethernet communication is like a television panel of politicians: many parties shouting at random, without waiting for others to finish. The Ethernet cable is a shared bus. When a host wishes to communicate with another host, it simply tries. If another host happens to be using the bus at that time, there is a collision and the host must try again at random until it is heard. This method naturally leads to contention for bandwidth. The system works quite well when traffic is low, but as the number of hosts competing for bandwidth increases, the probability of a collision increases in step. Contention can only be reduced by reducing the amount of traffic on the network segment. The illusion of many collisions can also be caused by incorrect wiring, or

Caution As mentioned previously, it is safe to experiment with fdisk on your primary system as long as you never write out the updated partition table. When you start fdisk, it creates an inmemory copy of the partition map for the specified disk and makes all of its changes there. It never updates your disk until you actually issue the w (write) command. Never issue the write command in fdisk unless you want to save your changes and update your disk s idea of its partitions. This can usually be undone, but if you have accidentally updated the partition table for your system s boot drive, and have changed any existing partition definitions, your system may well crash the next time that it tries to read from disk. If you accidentally save an updated partition table, you may be able to recover by booting from a rescue disk and manually recreating the old partition table within fdisk before you attempt to check the consistency of the drive (by using fsck). Unfortunately, this is impossible to guarantee, so be very careful when experimenting with fdisk.

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Now, let s go ahead and create a logical partition to hold a filesystem, as shown in Listing 3-4.

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Figure 9-9: Selecting printer type As you can see from Figure 9-9, you have a large range of print options available to you. Table 9-1 briefly describes those options.

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Printer Connection Parallel printer Description Until recently, parallel printers were the standard for PC printing. If you have a parallel/centronics printer connected to you computer, you should select this option. Fast becoming the de facto standard. If you have a USB printer connected to your machine, select this option. Serial printers are quite rare nowadays and have been superseded by USB printers. If you have a printer that connects to the serial port on your machine, select this option. Especially prominent on laptop machines. If you are using the infrared port to connect to a printer, select this option. If you have a CUPS server on your network that is acting as a central print server, select this option. Similarly, if you are using the traditional Unix print server as a central printing resource, select this option.

incorrectly terminated cable, which leads to reflections If collision rates are high, a wiring check might also be in order Disk thrashing: thrashing3 is a problem which occurs because of the slowness of disk head movements, compared to the speed of kernel time-sharing algorithms If two processes attempt to take control of a resource simultaneously, the kernel and its device drivers attempt to minimize the motion of the heads by queueing requested blocks in a special order The algorithms really try to make the disks traverse the disk platter uniformly, but the requests do not always come in a predictable or congenial order The result is that the disk heads can be forced back and forth across the disk, driven by different processes and slowing the system to a virtual standstill.

Description If you are trying to connect to a printer connected to a Windows machine, select this option. If you are on an IPX/NetWare environment and the printer is IPX-based, select this option. Most high-end printers can connect directly to the network. If you have a network/JetDirect printer, select this option. If none of the preceding options fits your bill, you can select this option. With this you can set a CUPS class or a pipe-based print queue, or you can enter a unique URL for a printer to see if it will work.

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