Date: Thu, 9 Jan 2014 09:14:12 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r260486 - head/etc/defaults Message-ID: <CAJ-Vmon7=Dtm--PN_YrXRY3hBGbvYP3reQAENn0OPVXgne26vg@mail.gmail.com> In-Reply-To: <52CECE57.4040002@FreeBSD.org> References: <201401091555.s09Fttju004938@svn.freebsd.org> <CAJ-VmokAfJVwHqdV=GojLj2EeDgU-njgVedWUBM6-Zv1mDgffw@mail.gmail.com> <52CEC79F.2090708@FreeBSD.org> <CAJ-Vmo=exgGkzq6sFrgBzgZB0TjNJRvZ3eo6=Fs%2BU1Rp354pvg@mail.gmail.com> <52CECE57.4040002@FreeBSD.org>
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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@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@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@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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