Linus Torvalds wrote:
The hardware sector size is very different. If you have a 32kB hardware sector size, that implies that _all_ IO has to be done with that granularity. Now you can no longer treat the eight pages as individual pages - you _have_ to write them out and read them in as one entity. If you dirty one page, you effectively dirty them all. You can not drop and re-allocate pages one at a time any more.
You can still drop clean pages. Sure, that costs you performance as you'll have to do re-read them in order to write a dirty page, but in the common case, the clean pages around would still be available and you'd avoid it.
Applications that randomly write to large files can be tuned to use the disk sector size. As for the rest, they're either read-only (executable mappings) or sequential.
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