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in some cases (SSD?) it makes sense to bypass pagecache to save on related overhead. 1GB/sec IO with 4K pages imply 256K pages/sec to allocate/insert into the cache which can be quite consuming in terms of CPU cycles and locking (especially for shared files).
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in some cases (SSD?) it makes sense to bypass pagecache to save on related overhead. 1GB/sec IO with 4K pages imply 256K pages/sec to allocate/insert into the cache which can be quite consuming in terms of CPU cycles and locking (especially for shared files).
Improvement
Minor
Alex Zhuravlev