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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 <> writes:

> The following reply was made to PR port-evbarm/56944; it has been noted by GNATS.
> From: Chuck Silvers <>
> To:


>  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 - - KC8VKS -

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