On Wed, Feb 13, 2019 at 01:03:37AM +0700, Eugene Grosbein wrote:
> 12.02.2019 23:34, Mark Johnston wrote:
>
> > I suspect that the "leaked" memory is simply being used to cache UMA
> > items. Note that the values in the FREE column of vmstat -z output are
> > quite large. The cached items are reclaimed only when the page daemon
> > wakes up to reclaim memory; if there are no memory shortages, large
> > amounts of memory may accumulate in UMA caches. In this case, the sum
> > of the product of columns 2 and 5 gives a total of roughly 4GB cached.
> >
> >> as well as "sysctl hw": http://www.grosbein.net/freebsd/leak/sysctl-hw.txt
> >> and "sysctl vm": http://www.grosbein.net/freebsd/leak/sysctl-vm.txt
>
> It seems page daemon is broken somehow as it did not reclaim several gigs of
> wired memory
> despite of long period of vm thrashing:
Depending on the system's workload, it is possible for the caches to
grow quite quickly after a reclaim. If you are able to run kgdb on the
kernel, you can find the time of the last reclaim by comparing the
values of lowmem_uptime and time_uptime.
> $ sed 's/:/,/' vmstat-z.txt | awk -F, '{printf "%10s %s\n", $2*$5/1024/1024,
> $1}' | sort -k1,1 -rn | head
> 1892 abd_chunk
> 454.629 dnode_t
> 351.35 zio_buf_512
> 228.391 zio_buf_16384
> 173.968 dmu_buf_impl_t
> 130.25 zio_data_buf_131072
> 93.6887 VNODE
> 81.6978 arc_buf_hdr_t_full
> 74.9368 256
> 57.4102 4096
>
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