Re: NFS client/buffer cache deadlock

From: Marc Olzheim (marcolz_at_stack.nl)
Date: 04/27/05

  • Next message: Steven Glogger: "SATA RAID 1 controllers for Intel board" 
    Date: Wed, 27 Apr 2005 21:19:38 +0200
To: Brian Fundakowski Feldman <green@freebsd.org>

    On Wed, Apr 27, 2005 at 03:06:27PM -0400, Brian Fundakowski Feldman wrote:
    > > How can I tell whether it uses transactions ?
    >
    > 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.
    >
    > > The NFS server is mounted with:
    > >
    > > mount_nfs -c -P -a 0 -r 8192 -w 8192 -i -o rw,noatime,nointr host:/path /nfs/host/path
    >
    > 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
    Client Info:
    Rpc Counts:
      Getattr Setattr Lookup Readlink Read Write Create Remove
        15272 20119 3401842 82797 548076917 594394 43551 42697
       Rename Link Symlink Mkdir Rmdir Readdir RdirPlus Access
        13077 27 11573 2957 2959 17178 0 24938388
        Mknod Fsstat Fsinfo PathConf Commit GLease Vacate Evict
            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 Misses
    376190541 24213879 94021997 3401840 325304623 545060579 699854 594394
    BioRLHits Misses BioD Hits Misses DirE Hits Misses
      3051125 82797 88340 17145 42013 0

    Server Info:
      Getattr Setattr Lookup Readlink Read Write Create Remove
            0 0 0 0 0 0 0 0
       Rename Link Symlink Mkdir Rmdir Readdir RdirPlus Access
            0 0 0 0 0 0 0 0
        Mknod Fsstat Fsinfo PathConf Commit GLease Vacate Evict
            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 Remove
        15272 20119 3401879 82797 548082677 607194 43552 42697
       Rename Link Symlink Mkdir Rmdir Readdir RdirPlus Access
        13077 27 11573 2957 2959 17178 0 24938698
        Mknod Fsstat Fsinfo PathConf Commit GLease Vacate Evict
            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 Misses
    376195207 24214181 94022936 3401877 325306477 545066339 699854 607194
    BioRLHits Misses BioD Hits Misses DirE Hits Misses
      3051125 82797 88340 17145 42013 0

    Server Info:
      Getattr Setattr Lookup Readlink Read Write Create Remove
            0 0 0 0 0 0 0 0
       Rename Link Symlink Mkdir Rmdir Readdir RdirPlus Access
            0 0 0 0 0 0 0 0
        Mknod Fsstat Fsinfo PathConf Commit GLease Vacate Evict
            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

  • Next message: Steven Glogger: "SATA RAID 1 controllers for Intel board"

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