set readahead buffer size from roundup(user_size) + 4k to roundup(use… #2138
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@lightmark has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator. |
siying
approved these changes
Apr 11, 2017
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@lightmark has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator. |
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Users usually set readahead buffer to a multiple of 4k, more than that, usually a multiple of blocks.
So previously we set real buffer size 512 * n + 4k, which may introduce an additional block reading.