We have 2 and 4 hw.ncpu NFS servers with 70+ disks, so there may be
cases, where even the default maximum of 256 threads is not enough to
feed the -otherwise slow- disks.
I guess the real solution here is to change the nfsd worker model to async.
(adapting to top poster)
On 01/09/14 18:14, Adrian Chadd wrote:
If it's one request per nfsd then we should likely scale it separate to
ncpu. Otherwise the default for two or core boxes may not be enough.
Adrian
On Jan 9, 2014 11:29 AM, "Alexander Motin" <m...@freebsd.org> wrote:
On 09.01.2014 18:18, Adrian Chadd wrote:
Depends if you're thinking locally or globally.
Locally - for nfs? not a big deal.
Globally - NFS, ZFS, GELI, geom/cam, NIC, etc.. suddenly your machine
could default to having a couple thousand worker threads just for a
HBA and a 10GE NIC. That's a little nuts.
So, what is your point? Each NFS thread (unlike GEOM or CAM) executes only
_one_ request at a time. Would you like your 128-core/many-spindle system
executed only 4 synchronous requests at a time?
On 9 January 2014 08:00, Alexander Motin <m...@freebsd.org> wrote:
On 09.01.2014 17:57, Adrian Chadd wrote:
.. so with say, 128 core boxes showing up, is this really a good
default?
And what is the price? 16K+ of KVA per thread for thread stack, etc? 4
threads is probably much worse default there. May be nfsd's default
could be
tuned, but obviously it should not be hardcoded value.
On 9 January 2014 07:55, Alexander Motin <m...@freebsd.org> wrote:
Author: mav
Date: Thu Jan 9 15:55:55 2014
New Revision: 260486
URL: http://svnweb.freebsd.org/changeset/base/260486
Log:
Remove very low default limit of 4 nfsd threads. nfsd's own
default
is
8 * hw.ncpu, that sounds more appropriate for these SMP/NCQ/...
days.
Modified:
head/etc/defaults/rc.conf
Modified: head/etc/defaults/rc.conf
============================================================
==================
--- head/etc/defaults/rc.conf Thu Jan 9 15:38:28 2014
(r260485)
+++ head/etc/defaults/rc.conf Thu Jan 9 15:55:55 2014
(r260486)
@@ -311,7 +311,7 @@ nfs_client_enable="NO" # This host is
a
nfs_access_cache="60" # Client cache timeout in seconds
nfs_server_enable="NO" # This host is an NFS server (or NO).
oldnfs_server_enable="NO" # Run the old NFS server (YES/NO).
-nfs_server_flags="-u -t -n 4" # Flags to nfsd (if enabled).
+nfs_server_flags="-u -t" # Flags to nfsd (if enabled).
mountd_enable="NO" # Run mountd (or NO).
mountd_flags="-r" # Flags to mountd (if NFS server
enabled).
weak_mountd_authentication="NO" # Allow non-root mount
requests
to be served.
--
Alexander Motin
--
Alexander Motin
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