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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