Date: Thu, 12 Nov 2009 11:38:13 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Jun Kuriyama <kuriyama@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r199067 - in head/sys: amd64/amd64 i386/i386 Message-ID: <20091112113708.I37440@maildrop.int.zabbadoz.net> In-Reply-To: <200911090254.nA92sG1G005921@svn.freebsd.org> References: <200911090254.nA92sG1G005921@svn.freebsd.org>
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On Mon, 9 Nov 2009, Jun Kuriyama wrote: Hi, > Author: kuriyama > Date: Mon Nov 9 02:54:16 2009 > New Revision: 199067 > URL: http://svn.freebsd.org/changeset/base/199067 > > Log: > - Add hw.clflush_disable loader tunable to avoid panic (trap 9) at > map_invalidate_cache_range() even if CPU is not Intel. > - This tunable can be set to -1 (default), 0 and 1. -1 is same as > current behavior, which automatically disable CLFLUSH on Intel CPUs > without CPUID_SS (should be occured on Xen only). You can specify 1 > when this panic happened on non-Intel CPUs (such as AMD's). Because > disabling CLFLUSH may reduce performance, you can try with setting 0 > on Intel CPUs without SS to use CLFLUSH feature. I wasn't able to boot dual Xeon machines anymore. svn merge -c -199067 $FBDSVN/head/sys sys fixed this problem. -- Bjoern A. Zeeb It will not break if you know what you are doing.
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