Linus Torvalds wrote:
Now, hopefully some of it will be in the disk cache, but when the mirroring happens, it will basically blow the disk caches away totally (when using the "--checksum" option), and then you literally have tens of seconds to generate that one top-level page.
If that was the only time that happened, it would be a non-issue, since that only happens once every 96 hours. However, the problem is that we now have lots of large datasets that blow out the caches on a much more frequent basis.
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