On Sat, Jan 04, 2014 at 06:46:55PM +0100, Andreas Hollmann wrote: > Hi, > > is possible to turn of numa balancing (introduced in 3.8) in a running kernel? I submitted a patch to do it some time ago https://lkml.org/lkml/2013/4/24/529 But it didn't seem to have made it in. Andrew? Mel? Yes I agree a disable switch is totally needed for such an intrusive feature, if only to isolate problems with it. -Andi > > I'm running a recent arch kernel and numa balancing is enabled by > default. I checked > several documents and found some sysctl variable which influence the behavior of > numa balance, but there is no clear documentation if it's possible to > disable it. > > The only defined way to disable it is using a kernel parameter > > numa_balancing= [KNL,X86] Enable or disable automatic NUMA balancing. > Allowed values are enable and disable > > Is there any other way? > > Best regards, > Andreas > > > $ uname -a > Linux inwest 3.12.6-1-ARCH #1 SMP PREEMPT Fri Dec 20 19:39:00 CET 2013 > x86_64 GNU/Linux > > $ cat /usr/src/linux-3.12.6-1-ARCH/.config | grep NUMA_BALANCING > CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y > CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y > CONFIG_NUMA_BALANCING=y > > $ ls -l /proc/sys/kernel | grep numa_bal > -rw-r--r-- 1 root root 0 Jan 4 14:23 numa_balancing_scan_delay_ms > -rw-r--r-- 1 root root 0 Jan 4 14:23 numa_balancing_scan_period_max_ms > -rw-r--r-- 1 root root 0 Jan 4 14:23 numa_balancing_scan_period_min_ms > -rw-r--r-- 1 root root 0 Jan 4 14:23 numa_balancing_scan_period_reset > -rw-r--r-- 1 root root 0 Jan 4 14:23 numa_balancing_scan_size_mb > -- > To unsubscribe from this list: send the line "unsubscribe linux-numa" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- 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>