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

[Brad Spencer <brad%anduin.eldar.org@localhost>]

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

[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
>  


Ya, that was another test.  In 9.x you could not even attempt to do that
as the ioctls are missing, but in -current the attempt will succeed.  I
reconfigured the guest to use another presented virtual disk and am
running the "zfs receive" test.  So far it is working without a hang,
with many times the amount of data sent then before, but it will take a
while to complete.  I have captured some vmstat -m output and noted that
the system does swap a little while the operation is running.  I will
post the info when it completes.


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