11.2-STABLE kernel wired memory leak

[Mike Tancsa]

On 2/20/2019 3:14 AM, Eugene Grosbein wrote:
> 20.02.2019 3:49, Mike Tancsa wrote:
>
>> On 2/19/2019 2:35 PM, Mike Tancsa wrote:
>>> dd if=/dev/zero of=/tanker/test bs=1m count=100000
>> The box has 32G of RAM. If I do a
>>
>> # sysctl -w vfs.zfs.arc_max=12224866304
>> vfs.zfs.arc_max: 32224866304 -> 12224866304
>> #
>>
>> after WIRED memory is at 29G, it doesnt immediately reclaim it and there
>> is memory pressure.  Booting the box with
>> vfs.zfs.arc_max=12224866304
>> keeps WIRED at 15G
> Can you repeat your test with additional vm.v_free_min=131072 (512M) or 262144 (1G)?
> For me, it makes kernel reclaim unused UMA memory quickly:
> first it goes from WIREE to FREE for a moment, then re-used as needed.

# sysctl -w vm.v_free_min=131072
vm.v_free_min: 51301 -> 131072
#

Keeping it at 1G seems to make things more smooth and stable and
programs are not being swapped out!




>
>

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-------------------
Mike Tancsa, tel +1 519 651 3400 x203
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada