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KernelTrap: Reworking Readahead

Sep 29, 2004, 07:00 (0 Talkback[s])

"Steven Pratt posted a request for comments to the lkml regarding a patch to simplify the readahead logic in the 2.6 Linux kernel. With the patch he offered some benchmark test results which he summarized by saying, "the new code was always equal to or better than the current code on all variation and all test configurations." Regarding the goal of the patch, he explains:

"'The key design point of the new design is to make the readahead code aware of the size of the I/O request. This change eliminates the need for treating large random I/O as sequential and all of the averaging code that exists just to support this...'"

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