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Re: port-evbarm/56944: ZFS heavy usage on NetBSD running in Mac M1 VM results in kernel thread running away and filesystem hang



Chuck Silvers <chuq%chuq.com@localhost> writes:

> The following reply was made to PR port-evbarm/56944; it has been noted by GNATS.
>
> From: Chuck Silvers <chuq%chuq.com@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Cc: 
> Subject: Re: port-evbarm/56944: ZFS heavy usage on NetBSD running in Mac M1
>  VM results in kernel thread running away and filesystem hang
> Date: Sat, 30 Jul 2022 05:20:10 -0700
>
>  On Sat, Jul 30, 2022 at 07:19:41AM -0400, Brad Spencer wrote:

[snip]

>  oh, you've got a zvol as swap space.  that has never worked on netbsd
>  and it's not going to work for the foreseeable future.  using a zfs file
>  as a swap file will also hang eventually.  you'll need to change your setup
>  to have the swap space be something that doesn't involve zfs.
>  
>  -Chuck
>  


After making swap a virtual disk, the "zfs receive" test completed after
about an hour and 15 minutes, which was never possible before.  The
receive was about 32GB of compressed zfs file set.  I would consider
this patch a keeper and maybe consider it for 9.x ....  I have attached
a couple of pstat -s and vmstat -m outputs.  One from part way though
the receive and one at the end.


-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org

Attachment: INFO.tar
Description: some info during the zfs receive test



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