As I understand if sendfile() with hardware TX chsum or TSO are used, then CPU does not touch file pages at all. So pagedaemon never set PG_REFERENCED to vnode object pages while scanning them. Does VM set PG_REFERENCED by another way ? Otherwise, often used files that accessed by sendfile() only have small chances to be cached by VM. -- Igor Sysoev http://sysoev.ru/en/Received on Tue Oct 09 2007 - 11:27:20 UTC
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