2.6.33 is Out! Say Good Bye to the Anticipatory Scheduler
It’s been a few days but the latest kernel, 2.6.33 is out. There are some changes that affect the storage world that you probably need to check out.
2.6.33 Anticipatory Scheduler
As mentioned in a previous article a great place to start learning about new features of the latest kernels is Kernel Newbie site. Kernel newbies has a nice review of the latest kernel, 2.6.33. There are a few things around storage that I want to point out.
The biggest thing is that the anticipatory IO scheduler. In a fairly recent article I did a quick glance at the IO schedulers in the kernel. One of them is called the Anticipartory Scheduler that anticipates subsequent block requests and caches them for use. Putting on your storage expert hat one can see that the anticipatory scheduler works really well for certain workloads. For example it has been observed that the Apache web server may achieve up to 71% more throughput using the anticipatory IO scheduler. On the other hand, it has been observed…
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