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Date: Sun, 18 Sep 2005 07:35:18 +0530
From: Joseph Koshy <joseph.koshy@gmail.com>
To: Andrew Gallatin <gallatin@cs.duke.edu>
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References: <20050914194612.15692485.lehmann@ans-netz.de>
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Cc: current@freebsd.org, Oliver Lehmann <lehmann@ans-netz.de>
Subject: Re: low(er) disk performance with sched_4bsd then with sched_ule
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> I don't know the disk codepath very well, but the samples look=20
> little suspect.

They do look odd.  For one, there are entries for the p4_*_pmc
functions which would never get called on a P-III box.

Oliver, after you sync'ed up with RELENG_6, did you keep the
sources for pmcstat(8) sync'ed with current?  If not, that
would explain the skewed profile.  Yesterday I MFC'ed a
few bug fixes so could you run the last step (pmcstat -g -R=20
/path-to-sample-file) with today's pmcstat(8)?   The file
"src/usr.sbin/pmcstat_log.c" should be at rev 1.3.2.1.

--=20
FreeBSD Volunteer,     http://people.freebsd.org/~jkoshy