Date: Sat, 31 Dec 2011 13:35:45 +0000 From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: Gavin Atkinson <gavin@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r229085 - in head/sys: amd64/amd64 i386/i386 Message-ID: <74F5764C-9E62-4B17-A142-984A9C8ECEF4@FreeBSD.org> In-Reply-To: <201112311324.pBVDOriM065030@svn.freebsd.org> References: <201112311324.pBVDOriM065030@svn.freebsd.org>
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On 31. Dec 2011, at 13:24 , Gavin Atkinson wrote: > Author: gavin > Date: Sat Dec 31 13:24:53 2011 > New Revision: 229085 > URL: http://svn.freebsd.org/changeset/base/229085 > > Log: > Default to not performing the early-boot memory tests when we detect we > are booting inside a VM. There are three reasons to disable this: > > o It causes the VM host to believe that all the tested pages or RAM are > in use. This in turn may force the host to page out pages of RAM > belonging to other VMs, or otherwise cause problems with fair resource > sharing on the VM cluster. > o It adds significant time to the boot process (around 1 second/Gig in > testing) Well for that argument the tunable exists... > o It is unnecessary - the host should have already verified that the > memory is functional etc. > > Note that this simply changes the default when in a VM - it can still be > overridden using the hw.memtest.tests tunable. > Thanks a lot for committing this! May I ask for a slightly earlier MFC than 4 weeks? /bz -- Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!
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