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Date:      Wed, 27 Apr 2005 21:19:38 +0200
From:      Marc Olzheim <marcolz@stack.nl>
To:        Brian Fundakowski Feldman <green@freebsd.org>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: NFS client/buffer cache deadlock
Message-ID:  <20050427191938.GE6256@stack.nl>
In-Reply-To: <20050427190627.GB39270@green.homeunix.org>
References:  <20050426160609.GA68511@stack.nl> <20050426162549.GD5789@green.homeunix.org> <20050426164346.GA68763@stack.nl> <20050426193602.GE5789@green.homeunix.org> <20050427081746.GA66441@stack.nl> <20050427160857.GF5789@green.homeunix.org> <20050427171523.GB5984@stack.nl> <20050427183435.GA39270@green.homeunix.org> <20050427184203.GD6256@stack.nl> <20050427190627.GB39270@green.homeunix.org>
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On Wed, Apr 27, 2005 at 03:06:27PM -0400, Brian Fundakowski Feldman wrote:
> > How can I tell whether it uses transactions ?
>=20
> I am not sure -- it should with NFSv3 though.  Does "mount -v" tell
> you anything more detailed?  I suppose that nfsstat may also be used
> -- the "commit" count should only increase when it does an NFSv3
> commit operation.
>=20
> > The NFS server is mounted with:
> >=20
> > mount_nfs -c -P -a 0 -r 8192 -w 8192 -i -o rw,noatime,nointr host:/path=
 /nfs/host/path
>=20
> So the only really visible difference is 6 nfsiod versus 20 nfsiod.  I
> think if you increased the nfsiod on that 4.x box to something much
> higher it would deadlock the same, then, assuming that all else is
> equal.

Well, I took on that challenge and although it seems that the machine
completely hangs itself up for a while, it snaps out of it after it is
done.

tehethereal tells me it is NFSv3, and the commits increase:

baroque:/se3/spiderbak>nfsstat=20
Client Info:
Rpc Counts:
  Getattr   Setattr    Lookup  Readlink      Read     Write    Create    Re=
move
    15272     20119   3401842     82797 548076917    594394     43551     4=
2697
   Rename      Link   Symlink     Mkdir     Rmdir   Readdir  RdirPlus    Ac=
cess
    13077        27     11573      2957      2959     17178         0  2493=
8388
    Mknod    Fsstat    Fsinfo  PathConf    Commit    GLease    Vacate     E=
vict
        0     61788        14         0    191593         0         0      =
   0
Rpc Info:
 TimedOut   Invalid X Replies   Retries  Requests
        0         0    210711    330710 577517143
Cache Info:
Attr Hits    Misses Lkup Hits    Misses BioR Hits    Misses BioW Hits    Mi=
sses
376190541  24213879  94021997   3401840 325304623 545060579    699854    59=
4394
BioRLHits    Misses BioD Hits    Misses DirE Hits    Misses
  3051125     82797     88340     17145     42013         0

Server Info:
  Getattr   Setattr    Lookup  Readlink      Read     Write    Create    Re=
move
        0         0         0         0         0         0         0      =
   0
   Rename      Link   Symlink     Mkdir     Rmdir   Readdir  RdirPlus    Ac=
cess
        0         0         0         0         0         0         0      =
   0
    Mknod    Fsstat    Fsinfo  PathConf    Commit    GLease    Vacate     E=
vict
        0         0         0         0         0         0         0      =
   0
Server Ret-Failed
                0
Server Faults
            0
Server Cache Stats:
   Inprog      Idem  Non-idem    Misses
        0         0         0         0
Server Lease Stats:
   Leases     PeakL   GLeases
        0         0         0
Server Write Gathering:
 WriteOps  WriteRPC   Opsaved
        0         0         0
baroque:/se3/spiderbak>/home/marcolz/src/writev 100 foo0
nfsstat
baroque:/se3/spiderbak>nfsstat
Client Info:
Rpc Counts:
  Getattr   Setattr    Lookup  Readlink      Read     Write    Create    Re=
move
    15272     20119   3401879     82797 548082677    607194     43552     4=
2697
   Rename      Link   Symlink     Mkdir     Rmdir   Readdir  RdirPlus    Ac=
cess
    13077        27     11573      2957      2959     17178         0  2493=
8698
    Mknod    Fsstat    Fsinfo  PathConf    Commit    GLease    Vacate     E=
vict
        0     61788        14         0    193252         0         0      =
   0
Rpc Info:
 TimedOut   Invalid X Replies   Retries  Requests
        0         0    210711    331410 577537710
Cache Info:
Attr Hits    Misses Lkup Hits    Misses BioR Hits    Misses BioW Hits    Mi=
sses
376195207  24214181  94022936   3401877 325306477 545066339    699854    60=
7194
BioRLHits    Misses BioD Hits    Misses DirE Hits    Misses
  3051125     82797     88340     17145     42013         0

Server Info:
  Getattr   Setattr    Lookup  Readlink      Read     Write    Create    Re=
move
        0         0         0         0         0         0         0      =
   0
   Rename      Link   Symlink     Mkdir     Rmdir   Readdir  RdirPlus    Ac=
cess
        0         0         0         0         0         0         0      =
   0
    Mknod    Fsstat    Fsinfo  PathConf    Commit    GLease    Vacate     E=
vict
        0         0         0         0         0         0         0      =
   0
Server Ret-Failed
                0
Server Faults
            0
Server Cache Stats:
   Inprog      Idem  Non-idem    Misses
        0         0         0         0
Server Lease Stats:
   Leases     PeakL   GLeases
        0         0         0
Server Write Gathering:
 WriteOps  WriteRPC   Opsaved
        0         0         0
baroque:/se3/spiderbak>

Marc

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