Date: Wed, 8 Jun 2005 21:01:47 +0200 From: Jens Schweikhardt <schweikh@schweikhardt.net> To: Doug White <dwhite@gumbysoft.com> Cc: freebsd-current@freebsd.org Subject: Re: Timekeeping hosed by factor 3, high lapic[01] interrupt rates Message-ID: <20050608190147.GA917@schweikhardt.net> In-Reply-To: <20050526205831.GA958@schweikhardt.net> References: <20050516113420.GA786@schweikhardt.net> <20050518150346.S87264@carver.gumbysoft.com> <20050519190129.GA1048@schweikhardt.net> <20050520122944.B8229@carver.gumbysoft.com> <20050521092857.GA847@schweikhardt.net> <20050522112845.S27009@carver.gumbysoft.com> <20050523175609.GA779@schweikhardt.net> <20050523210141.GA779@schweikhardt.net> <20050526102606.T69716@carver.gumbysoft.com> <20050526205831.GA958@schweikhardt.net>
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On Thu, May 26, 2005 at 10:58:31PM +0200, Jens Schweikhardt wrote:
# On Thu, May 26, 2005 at 10:30:16AM -0700, Doug White wrote:
# # On Mon, 23 May 2005, Jens Schweikhardt wrote:
# #
# # > ...
# # > # # 3. Backout rev 1.218 of src/sys/i386/isa/clock.c so the irq0 interrupt
# # > # # handler is reactivated and the RTC fiddled.
# # > #
# # > # Will do so next. I've nailed the change between March 6 and March 30.
# # > # 1.218 is from 2005/03/24 21:34:16, which would fit.
# # >
# # > We have a winner. Backing out 1.218 from a 2005/03/24 system does the trick,
# # > as well as a CURRENT without 1.218 (but 1.219-220 in there) bring back irq0
# # > and time dilation is gone. All clocks work correctly.
# #
# # Hm ... not sure what part of that commit is the bad part. You might try
# # changing
# #
# # if (!using_lapic_timer) {
# #
# # to
# #
# # if(1) {
# #
# # in the most recent rev of clock.c to register irq0 again. If that doesn't
# # chang ethe dialation then something else in the system must be depending
# # on the RTC periodic interrupt.
#
# It does make time dilation go away.
Any chance this gets backed out, or worked around, e.g. with a
sysctl, device hint, or some other knob?
Regards,
Jens
--
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)
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