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Date:      Wed, 9 Sep 2020 17:29:13 +0500
From:      "Eugene M. Zheganin" <emz@norma.perm.ru>
To:        freebsd-stable@FreeBSD.org
Subject:   spa_namespace_lock and concurrent zfs commands
Message-ID:  <e458ba84-c044-1502-3672-c89e353ef303@norma.perm.ru>

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Hello,

I'm using sort of FreeBSD ZFS appliance with custom API, and I'm 
suffering from huge timeouts when large (dozens, actually) of concurrent 
zfs/zpool commands are issued (get/create/destroy/snapshot/clone mostly).

Are there any tunables that could help mitigate this ?

Once I took part in reporting the 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203906 , but the issue 
that time got resolved somehow. Now I have another set of FreeBSD SANs 
and it;'s back. I've read the 
https://wiki.freebsd.org/AndriyGapon/AvgZFSLocking and I realize this 
probably doesn't have a quick solution, but still...


Thanks.


Eugene.




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