Mailinglist Archive: opensuse (1470 mails)

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Re: [opensuse] experiences with bache / logic of caching
17.02.2016 20:08, Per Jessen пишет:
The purpose of O_DIRECT is to move the cache handling from kernel
space to userspace. Does ietd not implement a cache in user space?

Almost certainly not - that would somewhat negate the idea of using direct
IO.

Not at all. Direct IO is used to avoid double buffering (which in some
cases can result in significant slow down) and give application full
control over when it flushes data to disk. It does not mean application
should refrain from caching.
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