CIFS performance Issue

From: Tim Driggers (timd@birthdayexpress.com)
Date: Fri Apr 02 2004 - 11:59:07 EST

  • Next message: Jack Lyons: "RE: CIFS performance Issue"

    Hi All,

    I have been playing with an F760 with ONTAP 6.4.1 for about thirty days. I
    am having a problem understanding a CIFS transfer rate difference I am
    seeing between writing to and from the NetApp.

    First, a little background:

    The F760 has a X1025B gigabit card (SX fiber) in it, connected to an Extreme
    BlackDiamond 6808. The BlackDiamond does -not- have jumbo frames enabled at
    this time. The NetApp has full flow control configured.

    I am able to copy a single (30GB) file (generated by mkfile in FreeBSD) to
    and from the NetApp over NFSv3 at between 92-96mbit consistently, with the
    FreeBSD using an NFS mount having a 100mbit link.

    I am able to copy the same 30GB file from the NetApp to a Windows 2000
    server using CIFS at 130-160mbit consistently. The Win2k server has a
    gigabit SX card. When copying the file to the NetApp from the Win2k server,
    I am seeing a maximum throughput of 69mbit, and usually it settles around
    33-40mbit. I am monitoring this transfer rate using 'sh port utillization'
    on the BlackDiamond. I have tested this on three different Win2k boxes, with
    nearly identical results. I have also followed instructions on NetApp's
    website on how to 'improve' performance through registry edits, with no
    apparent result (positive or negative). I have tried three different
    flowcontrol settings on the Win2k cards (send, recieve and full) - again
    with no change in performance.

    I'm thrilled with the NFS performance, but we are a windows shop. I need to
    get performance increased on the CIFS writes to the NetApp if it's possible.

    I have tried every tweak I could find, and nothing seems to change the rate
    at which I can write to the NetApp via CIFS. I have included some NetApp
    information:

     slot 8: Gigabit Ethernet Controller II
     e8 MAC Address: 00:03:47:25:36:6a (auto-1000sx-fd-up)
     slot 9: NVRAM
     Memory Size: 32 MB

    netapp1> options cifs
    cifs.audit.autosave.file.extension
    cifs.audit.autosave.file.limit 0
    cifs.audit.autosave.onsize.enable off
    cifs.audit.autosave.onsize.threshold 500k
    cifs.audit.autosave.ontime.enable off
    cifs.audit.autosave.ontime.interval
    cifs.audit.enable off
    cifs.audit.file_access_events.enable on
    cifs.audit.logon_events.enable on
    cifs.audit.logsize 524288
    cifs.audit.saveas /etc/log/adtlog.evt
    cifs.bypass_traverse_checking on
    cifs.comment
    cifs.guest_account
    cifs.home_dir
    cifs.home_dir_namestyle ntname
    cifs.home_dirs_public_for_admin on
    cifs.idle_timeout 1800
    cifs.max_mpx 50
    cifs.netbios_aliases
    cifs.netbios_over_tcp.enable on
    cifs.nfs_root_ignore_acl on
    cifs.oplocks.enable off
    cifs.oplocks.opendelta 8
    cifs.per_client_stats.enable off
    cifs.perm_check_ro_del_ok on
    cifs.perm_check_use_gid on
    cifs.restrict_anonymous.enable off
    cifs.save_case on
    cifs.scopeid
    cifs.search_domains
    cifs.show_snapshot off
    cifs.shutdown_msg_level 2
    cifs.sidcache.enable on
    cifs.sidcache.lifetime 1440
    cifs.snapshot_file_folding.enable off
    cifs.symlinks.cycleguard on
    cifs.symlinks.enable on
    cifs.tcp_window_size 64240
    cifs.trace_dc_connection off
    cifs.trace_login off
    cifs.wins_servers <edited>

    netapp1> options ip
    ip.fastpath.enable on
    ip.ipsec.enable off
    ip.match_any_ifaddr on
    ip.path_mtu_discovery.enable on
    ip.ping_throttle.alarm_interval 0
    ip.ping_throttle.drop_level 10
    ip.tcp.newreno.enable on
    ip.tcp.sack.enable off

    If anyone can help, I would really appreciate it. If I need to supply more
    information, please just ask.

    Thanks,

    Tim

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