drawback of transparent_hugepage=always?
Google around brings no clear statement
is there any drawback of boot with "transparent_hugepage=always" which
seems not to be the default currently - as far as i understand it should
recude the overhead of memory management (especially in virtual guests)
and seems to have been the default for some time
http://oracle-base.com/articles/linux/configuring-huge-pages-for-oracle-o...
at least talks about "You can check the current setting using the
following command, which is displaying the default value of
"enabled=[always]"
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/...
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[root@testserver:~]$ cat /sys/kernel/mm/transparent_hugepage/enabled
always [madvise] never
[root@testserver:~]$ grep Huge /proc/meminfo
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
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[root@testserver:~]$ cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never
[root@testserver:~]$ grep Huge /proc/meminfo
AnonHugePages: 194560 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
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