Date: Wed, 1 Oct 2003 01:39:03 -0400 (EDT) From: Jeff Roberson <jroberson@chesapeake.net> To: Jeff Roberson <jeff@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 support.s src/sys/i386/include md_var.h Message-ID: <20031001013745.K99666-100000@mail.chesapeake.net> In-Reply-To: <200310010525.h915PRwl062742@repoman.freebsd.org>
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This moves data 3.8x faster than bzero on my laptop. In a moment I will commit pmap bits to make use of it. This improved my 'make kernel' times by almost 2%. It will do even better in workloads that demand a lot of zero pages. On Tue, 30 Sep 2003, Jeff Roberson wrote: > jeff 2003/09/30 22:25:27 PDT > > FreeBSD src repository > > Modified files: > sys/i386/i386 support.s > sys/i386/include md_var.h > Log: > - Add ss2_pagezero() for zeroing pages using the movnti instruction. This > instruction is enabled with SSE2 but does not use SSE registers. It is a > "non-temporal" move which bypasses the cache and does not dirty lines. > > Revision Changes Path > 1.98 +14 -0 src/sys/i386/i386/support.s > 1.65 +1 -0 src/sys/i386/include/md_var.h >
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