From: Davidlohr Bueso <davidlohr@xxxxxx> The default size is, and always has been, 32Mb. Today, in the XXI century, it seems that this value is rather small, making users have to increase it via sysctl, which can cause unnecessary work and userspace application workarounds[1]. I have arbitrarily chosen a 4x increase, leaving it at 128Mb, and naturally, the same goes for shmall. While it may make more sense to set the value based on the system memory, this limit must be the same across all systems, and left to users to change if needed. [1]: http://rhaas.blogspot.com/2012/06/absurd-shared-memory-limits.html Signed-off-by: Davidlohr Bueso <davidlohr@xxxxxx> --- include/uapi/linux/shm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/shm.h b/include/uapi/linux/shm.h index 78b6941..754b605 100644 --- a/include/uapi/linux/shm.h +++ b/include/uapi/linux/shm.h @@ -12,7 +12,7 @@ * be increased by sysctl */ -#define SHMMAX 0x2000000 /* max shared seg size (bytes) */ +#define SHMMAX 0x8000000 /* max shared seg size (bytes) */ #define SHMMIN 1 /* min shared seg size (bytes) */ #define SHMMNI 4096 /* max num of segs system wide */ #ifndef __KERNEL__ -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>