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@ -30,14 +30,6 @@ Do not disable overcommit. The value `cat /proc/sys/vm/overcommit_memory` should
$ echo 0 | sudo tee /proc/sys/vm/overcommit_memory
```
## Huge Pages {#huge-pages}
Always disable transparent huge pages. It interferes with memory allocators, which leads to significant performance degradation.
``` bash
$ echo 'madvise' | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
```
Use `perf top` to watch the time spent in the kernel for memory management.
Permanent huge pages also do not need to be allocated.
@ -91,6 +83,15 @@ The Linux kernel prior to 3.2 had a multitude of problems with IPv6 implementati
Use at least a 10 GB network, if possible. 1 Gb will also work, but it will be much worse for patching replicas with tens of terabytes of data, or for processing distributed queries with a large amount of intermediate data.
## Huge Pages {#huge-pages}
If you are using old Linux kernel, disable transparent huge pages. It interferes with memory allocators, which leads to significant performance degradation.
On newer Linux kernels transparent huge pages are alright.
``` bash
$ echo 'madvise' | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
```
## Hypervisor configuration
If you are using OpenStack, set