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Product details

File Size: 20004 KB

Print Length: 926 pages

Page Numbers Source ISBN: 0321968972

Simultaneous Device Usage: Up to 5 simultaneous devices, per publisher limits

Publisher: Addison-Wesley Professional; 2 edition (September 25, 2014)

Publication Date: September 25, 2014

Sold by: Amazon Digital Services LLC

Language: English

ASIN: B00O56CFEE

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As a software engineer who doesn't actually use FreeBSD, I used this book to get implementation ideas about how a kernel would solve some interesting problems and this book addressed this hunger for information quite well, with all its detailed explanations. For example, my favourite parts are where data structures and algorithms are described (eg. how to make thread scheduling constant time with its calendar queues) and other similar ideas. If nothing else, this would help me during interviews.Now, some (hopefully constructive) criticism:The book visual text layout style looks very unappealing at first, like a wall of text from my "System Software" teacher back in the school days. I've seen the preview and bought the book despite the initial reaction, knowing that the content is actually great. Would be nice to increase the variety of styling tools used (side notes such as when introducing a new word, interesting facts on the side, etc), similar to what you'd see in other school textbooks.The organization seems a bit hard to follow: a lot of times, a topic is introduced, covered, and I feel deeply unsatisfied. Then another chapter later in the book would cover it deeper or from a different angle. Same goes for definitions: the term "superblock" was used 16 times before it was finally defined in 9.10, though I guess I could refer to a glossary.A lot of figures are super hard to follow, and would need more explanation about what exactly is going on. For example, Figure 4.3 "Turnstile structures for blocked threads" made no sense to me no matter how hard I looked and how long I re-read the explanations. I loved the overall description on turnstiles though, thank you!The whole section on network protocols seems vaguely applicable to FreeBSD kernel, though I wouldn't complain since it's free information. I happen to read a networking book in the past covering all the layers and I'm wondering there can be a balance in those chapters: introduce less details but keep enough of them so that the kernel operations still make sense to someone who doesn't have experience in networking. But then again, it's the first book that described Nagle algorithm in a way I could understand and I loved it. I don't know if any change is necessary, but that's the impression I got.The print quality control seems to be poor: a few pages in my book are badly printed (very pale) and are hard to read for that reason. Not sure if a common occurrence, and I didn't feel like returning the book because hey, most of the pages are fine and I don't want to be wasteful.

This book is beautifully done! Bravo!The way I see it, the kernel has two faces- one close to the hardware, and the other close to the person writing an application using system calls. And a big chunk in between. Here's the ? If FreeBSD and it's beautiful sister PC-BSD boot up into zfs, zfs is in the kernel, it's the mounted filesystem, why only 30-something pages in this edition on zfs ? This is a kernel book. If someone is writing system calls to work on or with the file system, they're working on the face of the kernel close to them, isn't that the face zfs presents itself via system calls to a programmer? Or is zfs on the face closest to the hardware? Not clear on this myself.I am still trying to understand what is being said in Chapter 7, but do see that excellent kernel diagram at the start of Chapter 7! I was hoping there would be more of a description of how zfs actually stitched into the kernel, on both faces and in the big chunk in the middle. It's probably closer to the hardware than I imagine. As I posted on the PC-BSD forums, the on-disk specification of zfs is complex. I don't see how the system calls you make have anything to do with zfs, unless I guess you are writing extensions to it.I would appreciate someone clarifying this issue for me, someone that does that kind of programming.***It doesn't seem as if the entire chapter, Chapter 9 on the Fast File System, is applicable any more to the two current BSD's. Perhaps historically. Too bad they didn't add those pages to zfs explication.***Just as a postscript, the only two UNIX systems that ship with zfs in the kernel that I know of are FreeBSD/PCBSD and Oracle Solaris/ OpenIndie. I know you can build it from openzfs source, into a Steve, Linus, or probably even Bill machine. But the only two families that have it pre-built in are the ones I mentioned.I only use Solaris 11.2 and PC-BSD 10.0.3. I have FreeNas, Nexentastor, and I never run a virtual machine or jails. Don't believe in it. Also only build from DVD from www.osdisc.com.Thanks for reading this!

The content of the book is highly technical and is densein operating system concepts. It is written with an excellent academic style.Compared to others classic "Internals" books,it focuses more on the design and algorithmic concepts andless on the specific detailed structures of the FreeBSD kernel.The design and implementation of the FreeBSD operating system book fits perfectlyfor an advanced operating system course, due to the academic style of presentation andto the fact that it covers new contemporary topics, as for example the ZFS file system, andan elaborate presentation of the networking architecture.FreeBSD is a rather technical and difficult to use operating system,but with its PC-BSD distribution, things radically change, it is as simple as e.g. Fedora Linux,OpenSuSE and Ubundu!Also it has an excellent package installer (i.a. AppCafe) and it is easy to experiment with the open source FreeBSDkernel, it seems that hacking with the FreeBSD kernel is easier than with the Linux kernel!However, even FreeBSD is a superb OS and supports a lot of applications, it still falls behind the support offered by Linux.The overall style of the book is similar to the "Solaris Internals" book,but the presentation although it is very clear, it is rather more compact and it needsusually a little more effort to understand.I feel that the book is a "must have" for every Operating System designer.

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