Date: Fri, 13 May 2011 15:41:10 -0500 From: Alan Cox <alc@rice.edu> To: Matthew D Fleming <mdf@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r221855 - in head/sys: amd64/include arm/include dev/md dev/null i386/include ia64/include mips/include powerpc/include sparc64/include sun4v/include sys vm Message-ID: <4DCD9766.4010601@rice.edu> In-Reply-To: <201105131935.p4DJZ14Q080511@svn.freebsd.org> References: <201105131935.p4DJZ14Q080511@svn.freebsd.org>
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On 5/13/2011 2:35 PM, Matthew D Fleming wrote: > Author: mdf > Date: Fri May 13 19:35:01 2011 > New Revision: 221855 > URL: http://svn.freebsd.org/changeset/base/221855 > > Log: > Move the ZERO_REGION_SIZE to a machine-dependent file, as on many > architectures (i386, for example) the virtual memory space may be > constrained enough that 2MB is a large chunk. Use 64K for arches > other than amd64 and ia64, with special handling for sparc64 due to > differing hardware. > > Also commit the comment changes to kmem_init_zero_region() that I > missed due to not saving the file. (Darn the unfamiliar development > environment). > > Arch maintainers, please feel free to adjust ZERO_REGION_SIZE as you > see fit. > > Requested by: alc > MFC after: 1 week > MFC with: r221853 I would encourage people on platforms with virtually indexed data caches to do a simple before and after performance test on this change, like "dd if=/dev/zero of=/dev/null bs=64k", just to make sure that there are no performance regressions. Alan
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