svn commit: r260486 - head/etc/defaults

[Attila Nagy]

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" <mav at 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 <mav at 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 <mav at 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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