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Default to --disable-debug-kmem

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The default kmem debugging (--enable-debug-kmem) can severely impact
performance on large-scale NUMA systems due to the atomic operations
used in the memory accounting. A 32-thread fio test running on a
40-core 80-thread system and performing 100% cached reads with kmem
debugging is:

Enabled:
READ: io=177071MB, aggrb=2951.2MB/s, minb=2951.2MB/s, maxb=2951.2MB/s,

Disabled:
READ: io=271454MB, aggrb=4524.4MB/s, minb=4524.4MB/s, maxb=4524.4MB/s,

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Issues #463
This commit is contained in:
Brian Behlendorf
2015-07-20 12:18:56 -07:00
parent 37d7cd94f3
commit 9eb361aaa5
2 changed files with 6 additions and 22 deletions
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config/spl-build.m4
+3 -4
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@@ -452,15 +452,14 @@ dnl #
dnl # Enabled by default it provides a minimal level of memory tracking.
dnl # A total count of bytes allocated is kept for each alloc and free.
dnl # Then at module unload time a report to the console will be printed
dnl # if memory was leaked. Additionally, /proc/spl/kmem/slab will exist
dnl # and provide an easy way to inspect the kmem based slab.
dnl # if memory was leaked.
dnl #
AC_DEFUN([SPL_AC_DEBUG_KMEM], [
AC_ARG_ENABLE([debug-kmem],
[AS_HELP_STRING([--enable-debug-kmem],
[Enable basic kmem accounting @<:@default=yes@:>@])],
[Enable basic kmem accounting @<:@default=no@:>@])],
[],
[enable_debug_kmem=yes])
[enable_debug_kmem=no])
AS_IF([test "x$enable_debug_kmem" = xyes],
[