Date: Tue, 9 Oct 2007 16:50:01 +0400 From: Igor Sysoev <is@rambler-co.ru> To: freebsd-current@freebsd.org Subject: sendfile and page usage statistics Message-ID: <20071009125001.GC5758@rambler-co.ru>
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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/
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