Slow nfsd write performance, tweaks needed

[Rick Macklem]

Mark Schouten wrote:
> Hi,
> 
> 
> I am in the process of switching from a ZFS On Linux-based NFS-server
> to a FreeBSD-based NFS-server. The FreeBSD implementation of ZFS is
> way superiour over ZoL, and the box serves as storage for a
> virtualizationplatform, so stability is welcome. :)
> 
> 
> The box is stable, but performs terribly. Surely, I'm doing something
> wrong, but I would like some tips and tricks to speed things up.
> 
> 
> 
> 
> Here's my setup:
> CPU: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz (HyperThreading is
> enabled)
> RAM: 64GB
> NIC: 2x igb in lagg0 (loadbalancing)
Oops, I didn't see this before my last post. igb had problems with
the 64K TSO issue and I'd try to get rid of lagg as well.
(You might be much better off just using a single net interface
 without lagg.)

Again, good luck with it, rick

> Disks:
> 
> export1     1.81T   914G   942G    49%  1.00x  ONLINE  -
>   mirror     928G   457G   471G         -
>     da0         -      -      -         -
>     da1         -      -      -         -
>   mirror     928G   457G   471G         -
>     da2         -      -      -         -
>     da3         -      -      -         -
>   mirror    9.94G   173M  9.77G         -
>     da4p1       -      -      -         -
>     da5p1       -      -      -         -
> cache           -      -      -      -      -      -
>   da4p2      223G   223G     8M         -
>   da5p2      223G   223G     8M         -
> 
> 
> da0-3 are 1TB WDs
> da4-5 are 240GB Samsung SSD 840s
> 
> 
> Here's (related) info from rc.conf.
> 
> nfs_server_enable="YES"
> nfs_server_flags="-u -t -n 128"
> rpcbind_enable="YES"
> mountd_enable="YES"
> rpc_lockd_enable="YES"
> rpc_statd_enable="YES"
> 
> 
> 
> 
> I have compression enabled on all the ZFS-filesystems, and
> jumboframes are enabled on the nics.
> 
> 
> As soon as one of the (Linux) clients start to do some IO, NFS
> responsetimes go up bigtime (yesterday up to 13 seconds), while the
> hardware is pretty much idle, I must be doing something very wrong.
> I'm mostly a Linux-guy, so any hit with a FreeBSD cluebat is
> appreciated.
> 
> 
> Regards,
> 
> 
> --
> Kerio Operator in de Cloud? https://www.kerioindecloud.nl/
> Mark Schouten  | Tuxis Internet Engineering
> KvK: 61527076 | http://www.tuxis.nl/
> T: 0318 200208 | info at tuxis.nl