libtorrent was the first client to support the extension protocol together with µTorrent, which is now a foundation that many other extensions build upon.
Another problem with large piece sizes is that it is harder for a client to pinpoint the malicious or buggy peer when a piece fails, and it will take longer to re-download it and take more tries before the piece succeeds the larger the pieces are.
On low-memory systems, the disk cache can be disabled altogether or set to smaller limit, to save memory.
In order to conserve memory, and system calls, iovec file operations are used to flush multiple cache blocks in a single call.
The cache blocks that are in used, are locked into physical memory to avoid it being paged out to disk. Allowing the disk cache to be paged out to disk means that it would become extremely inefficient to flush it, since it would have to be read back into physical memory only to be flushed back out to disk again.
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