Whoops, meant to send this to the list too: ---------- Forwarded message ---------- From: Philip Guenther <guent...@gmail.com> Date: Sat, Apr 14, 2018 at 11:13 PM Subject: Re: swapctl question To: Z Ero <zerotetrat...@gmail.com>
On Sat, Apr 14, 2018 at 10:37 PM, Z Ero <zerotetrat...@gmail.com> wrote: > amd64, 6.2 > > I have my swap partition set to priority 9 in fstab. > > Why does swapctl report priority 0? > The compiled in default swap location (normally the 'b' partition of the boot disk) is added as swap at priority zero in kernel startup as part of uvm_swap_init(), before any userspace processes are started or /etc/fstab is read. # swapctl > Device 512-blocks Used Avail Capacity Priority > /dev/sd0b 11874624 1266232 10608392 11% 0 > # cat /etc/fstab > You only have one swap device so the priority doesn't matter: priority is for selection _among_ swap devices and has no effect on the kernel's decision of _whether_ to swap out a page. I want to minimize swapping since I am using a mechanical hard disk > and thus swap slows things down. > Slows things down relative to _what_? Which statistics have you been examining when under the workload you're interested in? Philip Guenther
