[Beowulf] out - fixes VM regression

Chris Samuel csamuel at vpac.org
Tue Jun 24 19:02:13 PDT 2008


# The stable kernel update is available.
# This one contains a relatively small set of patches;
# one of them might be security-related, and another
# addresses a serious virtual memory performance regression 

The problem is explained in a previous version of the patch:


# In particular, the removal of ZERO_PAGE effectively
# removed the core file writing optimization where we
# would skip writing pages that had not been populated
# at all, and increased memory pressure a lot by allocating
# all those useless newly zeroed pages.

Christopher Samuel - (03) 9925 4751 - Systems Manager
 The Victorian Partnership for Advanced Computing
 P.O. Box 201, Carlton South, VIC 3053, Australia
VPAC is a not-for-profit Registered Research Agency

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