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context: add a comment explaining why we are not adding bees_unreadahead

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At the end of scanning one extent, in theory we do not need that extent
any more.  In practice, it hurts benchmark scores if we drop the extents
after reading them.

Add a comment to note this where we put the bees_unreadhead call.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-10-31 20:45:24 -04:00
parent 7f7f919d08
commit ecf110f377
1 changed files with 2 additions and 0 deletions
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src/bees-context.cc
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@ -717,6 +717,8 @@ BeesContext::scan_one_extent(const BeesFileRange &bfr, const Extent &e)
BEESLOGINFO("scan: " << pretty(e.size()) << " " << to_hex(e.begin()) << " [" << bar << "] " << to_hex(e.end()) << ' ' << name_fd(bfr.fd()));
}
// Costs 10% on benchmarks
// bees_unreadahead(bfr.fd(), bfr.begin(), bfr.size());
return bfr;
}