ppti.info Education Tcp Ip Illustrated Volume 2 Pdf


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TCP IP Illustrated, Volume 2: The implementation. Home · TCP IP Illustrated, Volume Modbus messaging on TCP-IP implementation ppti.info · Read more. TCP IP Illustrated, Volume 2: The implementation IP Illustrated, Volume 1: The Protocols The Illustrated Encyclopedia of Hinduism (2 Volume Set). Read online, or download in secure PDF or secure EPUB format. TCP/IP Illustrated, Volume 2 contains a thorough explanation of how TCP/IP protocols are.

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TCP/IP Illustrated, an ongoing series covering the many facets of TCP/IP, brings a highly-effective visual approach to learning about this networking protocol. Editorial Reviews. From the Back Cover. TCP/IP Illustrated, an ongoing series covering the many facets of TCP/IP, brings a highly-effective visual approach to. TCP/IPIllustrated,. Volume 3. Tº insactiºns. HTTP NNTP,. º. 3. º and the UNIX* Domain Protocols: s. º. Page 2 TCP/IP Illustrated, Volume 3.

Heavy use is made of diagrams throughout the text - there are over diagrams. This data-structures approach allows readers to use the book in various ways.

Those interested in all the implementation details can read the entire text from start to finish, following through all the source code. Others might want to understand how the protocols are implemented by understanding all the data structurestand reading all the text, but not following through all the source code. We anticipate that many readers are interested in specific portions of the book and will want to go directly to those chapters. Therefore many forward and backward references are provided throughout the text, along with a thorough index, to allow individual chapters to be studied by themselves.

The inside back covers contain an alphabetical cross-reference of all the functions and macros described in the book and the starting page number of the description.

Exercises are provided at the end of the chapters; most solutions are in Appendix A to maximize the usefulness of the text as a self-study reference.

Source Code Copyright All of the source code presented in this book, other than Figures 1.

This software is publicly available through many sources Appendix B. Ananda Vardhana. A special thanks to the consulting editor, Brian Kernighan, for his rapid, thorough, and helpful reviews throughout the course of the project, and for his continued encouragement and support. Our thanks also to the U.

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Thank you Sally, Bill, Ellen, and David. The hardwork, professionalism, and support of the team at Addison-Wesley has made the authors' job that much easier. In particular, we wish to thank John Wait for his guidance and Kim Dawley for her creative ideas. Monitoring this data can be difficult. It is easy to obtain, but there is no standardization of the field values. Different drivers, or even different versions of the same driver might produce different field names that have the same meaning.

Next, you will have to read your driver source. In the case of a register value, you should consult the data sheet for your hardware to determine what the meaning of the counter really is; many of the labels given via ethtool can be misleading.

Using sysfs sysfs also provides a lot of statistics values, but they are slightly higher level than the direct NIC level stats provided. You can find the number of dropped incoming network data frames for, e. Monitor higher level NIC statistics with sysfs. Unfortunately, it is up to the drivers to decide what the meaning of each field is, and thus, when to increment them and where the values come from.

You may notice that some drivers count a certain type of error condition as a drop, but other drivers may count the same as a miss. If these values are critical to you, you will need to read your driver source to understand exactly what your driver thinks each of these values means. The caveat mentioned above applies here, as well: if these values are important to you, you will still need to read your driver source to understand exactly when, where, and why they are incremented to ensure your understanding of an error, drop, or fifo are the same as your driver.

Note: not all device drivers will have support for this operation.

TCP IP Illustrated Volume 3.pdf - WordPress.com

Error seen if your NIC doesn't support this operation. Note: some devices and their drivers only support combined queues that are paired for transmit and receive, as in the example in the above section. This may not matter much for a one-time change, though. Exactly how this works is hardware specific, but luckily ethtool provides a generic way for users to adjust the size. Increasing the size of the RX queue can help prevent network data drops at the NIC during periods where large numbers of data frames are received.

Data may still be dropped in software, though, and other tuning is required to reduce or eliminate drops completely.

Tcp Ip Illustrated Vol 2

Adjusting the processing weight of RX queues Some NICs support the ability to adjust the distribution of network data among the RX queues by setting a weight. You can configure this if: Your NIC supports flow indirection. You are running a new enough version of ethtool that has support for the command line options -x and -X to show and set the indirection table, respectively.

So, a packet which hashes to 2 will be delivered to receive queue 0, while a packet which hashes to 3 will be delivered to receive queue 1.

Adjusting the rx hash fields for network flows You can use ethtool to adjust the fields that will be used when computing a hash for use with RSS.

TCP IP Illustrated. The Protocols

Adjusting the fields to take a hash on is useful, but ntuple filtering is even more useful for finer grained control over which flows will be handled by which RX queue. For example, the user can specify that TCP packets destined to a particular port should be sent to RX queue 1.

Other NIC vendors may have other marketing names for this feature. This feature can be useful if the operational requirements of the system involve maximizing data locality with the hope of increasing CPU cache hit rates when processing network data.

For example consider the following configuration for a webserver running on port A webserver running on port 80 is pinned to run on CPU 2. All incoming traffic to port 80 is then processed by CPU 2 starting at data arrival to the userland program.

Careful monitoring of the system including cache hit rates and networking stack latency will be needed to determine effectiveness. You can add a rule by specifying it on the command line to ethtool.

This can be useful for mitigating heavy incoming traffic from specific IP addresses. For more information about configuring ntuple filter rules, see the ethtool man page.

You can usually get statistics about the success or failure of your ntuple rules by checking values output from ethtool -S [device name]. Consult your device driver source and device data sheet for tracking down statistics counters if available. What is a softirq? The softirq system in the Linux kernel is a mechanism for executing code outside of the context of an interrupt handler implemented in a driver.

This system is important because hardware interrupts may be disabled during all or part of the execution of an interrupt handler.

The longer interrupts are disabled, the greater chance that events may be missed.The contents of the byte buffer are indeterminate since it is an uninitialized array allocated on the run-time stack, but that's OK for this example because the server never looks at the contents of the datagram that it receives.

Example Program We'll use the simple C program shown in Figure 1.

Richard Stevens was an acknowledged UNIX and networking expert and the highly-respected author of several books. The tab stops have been set to four-column boundaries to allow the lines to fit on a page. Each nonblank line is numbered.

Keeping counters on several nodes would mean they would go out of sync.

Remember that GC can pause a running thread at any point, including the point that is maximally inconvenient for you between the last check and the write operation. Gary R. If MSI-X is unavailable, MSI still presents advantages over legacy interrupts and will be used by the driver if the device supports it.

I bought this book shortly after finishing Volume 1.

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