diff options
| author | Brian Behlendorf <[email protected]> | 2015-07-20 12:18:56 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2015-07-21 11:47:10 -0700 |
| commit | 9eb361aaa537724c9a90ab6a9f33521bfd80bad9 (patch) | |
| tree | e42f5c6f639cf2bac26d4516b4be24143dfa0c5c /config | |
| parent | 37d7cd94f326896ffbd3f7609a20562c000cd4c8 (diff) | |
Default to --disable-debug-kmem
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 <[email protected]>
Signed-off-by: Tim Chase <[email protected]>
Issues #463
Diffstat (limited to 'config')
| -rw-r--r-- | config/spl-build.m4 | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index 9999d480d..daa9eb714 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -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], [ |