Date: Tue, 13 Sep 2011 08:17:42 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Brett Glass <brett@lariat.net> Subject: Re: Negative ping times with FreeBSD 8.1-RELEASE on older Celeron system Message-ID: <201109130817.42232.jhb@freebsd.org> In-Reply-To: <201109122153.PAA20860@lariat.net> References: <201109111852.MAA08146@lariat.net> <14112_1315854090_4E6E570A_14112_184_1_D9B37353831173459FDAA836D3B43499C803FA06@WADPMBXV0.waddell.com> <201109122153.PAA20860@lariat.net>
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On Monday, September 12, 2011 5:53:39 pm Brett Glass wrote: > More information regarding the odd behavior I'm seeing. Turns out > that packets do not even need to leave the machine for it to > report large negative ping times, on the order of more than half > a second. (See below.) Clearly something is odd about timekeeping > in this system (SiS motherboard chipset, PII-generation Celeron > but still effectively a "686") which was not a problem when it was > running FreeBSD 4.11-RELEASE (as it was before). Any ideas? 4.x didn't support the ACPI timer. I would look at the kern.timecounter sysctls. Maybe try forcing it to use the TSC. -- John Baldwin
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