Re: Fwd: Debian 11: Tuning kernel parameters swappiness and watermark_boost_factor to stop SWAP Storm
On Fri, 2022-01-28 at 17:31 +0100, Marco Möller wrote:
> On 28.01.22 11:15, Steven J. West wrote:
> > Comparing the Ubuntu and Debian kernel parameters using sudo sysctl
> > -a
> > showed two key differences in virtual memory (vm) management
> > parameters.
> >
> > * Ubuntu:
> > o vm.swappiness=60
> > o vm.watermark_boost_factor=0
> > * Debian:
> > o vm.swappiness=10
> > o vm.watermark_boost_factor=150
>
> Might this "150" be a typographical error and you wanted to write
> 150000?
> Your reference to the Red Hat documentation states 150000 to be the
> default in Red Hat, and in my Debian, where I have not touched this
> value, it is also set to 150000.
Might 150000 be a typographical error too? ;-) On my machine...
# cat /proc/sys/vm/watermark_boost_factor
15000
Which matches the default in the kernel source code [1] and 'git blame'
shows that line hasn't been changed since the original commit in 2018
[2]
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/page_alloc.c?id=169387e2aa291a4e3cb856053730fe99d6cec06f#n354
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1c30844d2dfe272d58c8fc000960b835d13aa2ac
--
Tixy
Reply to: