Date: Tue, 26 Feb 2013 16:28:12 +0100 From: Attilio Rao <attilio@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: svn-src-projects@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r247319 - in projects/calloutng/sys: kern sys Message-ID: <CAJ-FndDunwgsV4FVFNhDcmQm8L21YMrGANjh8caUqL-v4qvhDQ@mail.gmail.com> In-Reply-To: <201302261525.r1QFPhLt058080@svn.freebsd.org> References: <201302261525.r1QFPhLt058080@svn.freebsd.org>
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On Tue, Feb 26, 2013 at 4:25 PM, Alexander Motin <mav@freebsd.org> wrote: > Author: mav > Date: Tue Feb 26 15:25:43 2013 > New Revision: 247319 > URL: http://svnweb.freebsd.org/changeset/base/247319 > > Log: > Optimize callout_process() to use less variables and less conditions to > implement the same logic. Now it fits better into CPU registers, and > according to PMC significntly reduces number of resource stalls, reducing > consumed by it CPU time during usleep(1) benchmark by 30%. Is that all improved i-cache capacity and improved dynamic branch prediction (hwpmc has counters for both FWIW)? Attilio -- Peace can only be achieved by understanding - A. Einstein
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