Здраствуйте.
Помогите оптимизоровать работу ДНС сервера unbound, под 10000 абонентов. Или достаточно тех пунктов в конфиге которые я настроил ?

CentOS 6.0 i686

RAM
MemTotal:        3884040 kB

CPU
model name      : Intel(R) Core(TM)2 Duo CPU     E7300  @ 2.66GHz
stepping        : 6
cpu MHz         : 1600.000
cache size      : 3072 KB

#
# See unbound.conf(5) man page.
#
# this is a comment.

#Use this to include other text into the file.
#include: "otherfile.conf"

# The server clause sets the main parameters.
server:
    # whitespace is not necessary, but looks cleaner.

    # verbosity number, 0 is least verbose. 1 is default.
    verbosity: 1

    # print statistics to the log (for every thread) every N seconds.
    # Set to "" or 0 to disable. Default is disabled.
    # Needed for munin plugin
    statistics-interval: 0
    
    # enable cumulative statistics, without clearing them after printing.
    # Needed for munin plugin
    statistics-cumulative: no

    # enable extended statistics (query types, answer codes, status)
    # printed from unbound-control. default off, because of speed.
    # Needed for munin plugin
    extended-statistics: yes

    # number of threads to create. 1 disables threading.
    num-threads: 2

    # specify the interfaces to answer queries from by ip-address.
    # The default is to listen to localhost (127.0.0.1 and ::1).
    # specify 0.0.0.0 and ::0 to bind to all available interfaces.
    # specify every interface on a new 'interface:' labelled line.
    # The listen interfaces are not changed on reload, only on restart.
      interface: 95.86.128.67
    # interface: ::0
    # interface: 192.0.2.153
    # interface: 192.0.2.154
    # interface: 2001:DB8::5
    
    # enable this feature to copy the source address of queries to reply.
    # Socket options are not supported on all platforms. experimental.
    # NOTE: Enable this option when specifying interface 0.0.0.0 or ::0
    # NOTE: Disabled per Fedora policy not to listen to * on default install
    # interface-automatic: yes
    interface-automatic: no

    # port to answer queries from
      port: 53

    # specify the interfaces to send outgoing queries to authoritative
    # server from by ip-address. If none, the default (all) interface
    # is used. Specify every interface on a 'outgoing-interface:' line.
      outgoing-interface: 95.86.128.67
    # outgoing-interface: 2001:DB8::5
    # outgoing-interface: 2001:DB8::6

    # number of ports to allocate per thread, determines the size of the
    # port range that can be open simultaneously.
          outgoing-range: 950
    
    # permit unbound to use this port number or port range for
    # making outgoing queries, using an outgoing interface.
    # outgoing-port-permit: 32768

    # deny unbound the use this of port number or port range for
    # making outgoing queries, using an outgoing interface.
    # Use this to make sure unbound does not grab a UDP port that some
    # other server on this computer needs. The default is to avoid
    # IANA-assigned port numbers.
    # outgoing-port-avoid: "3200-3208"

    # number of outgoing simultaneous tcp buffers to hold per thread.
    # outgoing-num-tcp: 10

    # number of incoming simultaneous tcp buffers to hold per thread.
    # incoming-num-tcp: 10

    # buffer size for UDP port 53 incoming (SO_RCVBUF socket option).
    # 0 is system default.  Use 4m to catch query spikes for busy servers.
      so-rcvbuf: 4

    # EDNS reassembly buffer to advertise to UDP peers (the actual buffer
    # is set with msg-buffer-size). 1480 can solve fragmentation (timeouts).
    # edns-buffer-size: 4096
      
    # buffer size for handling DNS data. No messages larger than this
    # size can be sent or received, by UDP or TCP. In bytes.
    # msg-buffer-size: 65552

    # the amount of memory to use for the message cache.
    # plain value in bytes or you can append k, m or G. default is "4Mb".
      msg-cache-size: 50m

    # the number of slabs to use for the message cache.
    # the number of slabs must be a power of 2.
    # more slabs reduce lock contention, but fragment memory usage.
      msg-cache-slabs: 4

    # the number of queries that a thread gets to service.
      num-queries-per-thread: 4096

    # if very busy, 50% queries run to completion, 50% get timeout in msec
    # jostle-timeout: 200

    # the amount of memory to use for the RRset cache.
    # plain value in bytes or you can append k, m or G. default is "4Mb".
      rrset-cache-size: 100m

    # the number of slabs to use for the RRset cache.
    # the number of slabs must be a power of 2.
    # more slabs reduce lock contention, but fragment memory usage.
      rrset-cache-slabs: 4

    # the time to live (TTL) value lower bound, in seconds. Default 0.
    # If more than an hour could easily give trouble due to stale data.
    # cache-min-ttl: 0

    # the time to live (TTL) value cap for RRsets and messages in the
    # cache. Items are not cached for longer. In seconds.
    # cache-max-ttl: 86400

    # the time to live (TTL) value for cached roundtrip times and
    # EDNS version information for hosts. In seconds.
    # infra-host-ttl: 900

    # the time to live (TTL) value for cached lame delegations. In sec.
    # infra-lame-ttl: 900

    # the number of slabs to use for the Infrastructure cache.
    # the number of slabs must be a power of 2.
    # more slabs reduce lock contention, but fragment memory usage.
      infra-cache-slabs: 4

    # the maximum number of hosts that are cached (roundtrip times, EDNS).
    # infra-cache-numhosts: 10000

    # the maximum size of the lame zones cached per host. in bytes.
    # infra-cache-lame-size: 10k

    # Enable IPv4, "yes" or "no".
      do-ip4: yes

    # Enable IPv6, "yes" or "no".
    # do-ip6: yes

    # Enable UDP, "yes" or "no".
      do-udp: yes

    # Enable TCP, "yes" or "no".
     do-tcp: yes

    # upstream connections use TCP only (and no UDP), "yes" or "no"
    # useful for tunneling scenarios, default no.
    # tcp-upstream: no

    # Detach from the terminal, run in background, "yes" or "no".
    # do-daemonize: yes

    # control which clients are allowed to make (recursive) queries
    # to this server. Specify classless netblocks with /size and action.
    # By default everything is refused, except for localhost.
    # Choose deny (drop message), refuse (polite error reply),
    # allow (recursive ok), allow_snoop (recursive and nonrecursive ok)
          access-control: 95.86.128.0/18 allow
          access-control: 0.0.0.0/0 refuse
    # access-control: ::0/0 refuse
    # access-control: ::1 allow
      access-control: ::ffff:127.0.0.1 allow

    # if given, a chroot(2) is done to the given directory.
    # i.e. you can chroot to the working directory, for example,
    # for extra security, but make sure all files are in that directory.
    #
    # If chroot is enabled, you should pass the configfile (from the
    # commandline) as a full path from the original root. After the
    # chroot has been performed the now defunct portion of the config
    # file path is removed to be able to reread the config after a reload.
    #
    # All other file paths (working dir, logfile, roothints, and
    # key files) can be specified in several ways:
    #     o as an absolute path relative to the new root.
    #     o as a relative path to the working directory.
    #     o as an absolute path relative to the original root.
    # In the last case the path is adjusted to remove the unused portion.
    #
    # The pid file can be absolute and outside of the chroot, it is
    # written just prior to performing the chroot and dropping permissions.
    #
    # Additionally, unbound may need to access /dev/random (for entropy).
    # How to do this is specific to your OS.
    #
    # If you give "" no chroot is performed. The path must not end in a /.
      chroot: "/var/lib/unbound"
    # chroot: ""

    # if given, user privileges are dropped (after binding port),
    # and the given username is assumed. Default is user "unbound".
    # If you give "" no privileges are dropped.
    username: "unbound"

    # the working directory. The relative files in this config are
    # relative to this directory. If you give "" the working directory
    # is not changed.
    directory: "/etc/unbound"

    # the log file, "" means log to stderr.
    # Use of this option sets use-syslog to "no".
      logfile: "/var/log/unbound.log"
    
    # Log to syslog(3) if yes. The log facility LOG_DAEMON is used to
    # log to, with identity "unbound". If yes, it overrides the logfile.
      use-syslog: no

    # print UTC timestamp in ascii to logfile, default is epoch in seconds.
     log-time-ascii: yes

    # the pid file. Can be an absolute path outside of chroot/work dir.
     pidfile: "/var/run/unbound/unbound.pid"
    
    # file to read root hints from.
    # get one from ftp://FTP.INTERNIC.NET/domain/named.cache
      root-hints: "/etc/unbound/named.cache"
    
    # enable to not answer id.server and hostname.bind queries.
      hide-identity: yes
    
    # enable to not answer version.server and version.bind queries.
      hide-version: yes
    
    # the identity to report. Leave "" or default to return hostname.
      identity: "DNS"
    
    # the version to report. Leave "" or default to return package version.
    #  version: "1.4"
    
    # the target fetch policy.
    # series of integers describing the policy per dependency depth.
    # The number of values in the list determines the maximum dependency
    # depth the recursor will pursue before giving up. Each integer means:
    #     -1 : fetch all targets opportunistically,
    #     0: fetch on demand,
    #    positive value: fetch that many targets opportunistically.
    # Enclose the list of numbers between quotes ("").
    # target-fetch-policy: "3 2 1 0 0"
    
    # Harden against very small EDNS buffer sizes.
    # harden-short-bufsize: no
    
    # Harden against unseemly large queries.
    # harden-large-queries: no
    
    # Harden against out of zone rrsets, to avoid spoofing attempts.
      harden-glue: yes
    
    # Harden against receiving dnssec-stripped data. If you turn it
    # off, failing to validate dnskey data for a trustanchor will
    # trigger insecure mode for that zone (like without a trustanchor).
    # Default on, which insists on dnssec data for trust-anchored zones.
      harden-dnssec-stripped: yes

        # Harden the referral path by performing additional queries for
    # infrastructure data.  Validates the replies (if possible).
    # Default off, because the lookups burden the server.  Experimental
    # implementation of draft-wijngaards-dnsext-resolver-side-mitigation.
      harden-referral-path: yes

    # Use 0x20-encoded random bits in the query to foil spoof attempts.
    # This feature is an experimental implementation of draft dns-0x20.
      use-caps-for-id: yes
    
    # Enforce privacy of these addresses. Strips them away from answers.
    # It may cause DNSSEC validation to additionally mark it as bogus.
    # Protects against 'DNS Rebinding' (uses browser as network proxy).
    # Only 'private-domain' and 'local-data' names are allowed to have
    # these private addresses. No default.
    # private-address: 10.0.0.0/8
    # private-address: 172.16.0.0/12
    # private-address: 192.168.0.0/16
    # private-address: 192.254.0.0/16
    # private-address: fd00::/8
    # private-address: fe80::/10

    # Allow the domain (and its subdomains) to contain private addresses.
    # local-data statements are allowed to contain private addresses too.
    # private-domain: "example.com"
    
    # If nonzero, unwanted replies are not only reported in statistics,
    # but also a running total is kept per thread. If it reaches the
    # threshold, a warning is printed and a defensive action is taken,
    # the cache is cleared to flush potential poison out of it.
    # A suggested value is 10000000, the default is 0 (turned off).
    unwanted-reply-threshold: 10000000

    # Do not query the following addresses. No DNS queries are sent there.
    # List one address per entry. List classless netblocks with /size,
      do-not-query-address: 127.0.0.1/8
    # do-not-query-address: ::1
    
    # if yes, the above default do-not-query-address entries are present.
    # if no, localhost can be queried (for testing and debugging).
      do-not-query-localhost: yes

    # if yes, perform prefetching of almost expired message cache entries.
    prefetch: yes

    # if yes, perform key lookups adjacent to normal lookups.
    prefetch-key: yes

    # module configuration of the server. A string with identifiers
    # separated by spaces. "iterator" or "validator iterator"
      module-config: "iterator"
    
    # File with DLV trusted keys. Same format as trust-anchor-file.
    # There can be only one DLV configured, it is trusted from root down.
    # Downloaded from https://secure.isc.org/ops/dlv/dlv.isc.org.key
    dlv-anchor-file: "/etc/unbound/dlv.isc.org.key"

    # File with trusted keys for validation. Specify more than one file
    # with several entries, one file per entry.
    # Zone file format, with DS and DNSKEY entries.
    # trust-anchor-file: ""

    # File with trusted keys, kept uptodate using RFC5011 probes,
    # initial file like trust-anchor-file, then it stores metadata.
    # Use several entries, one per domain name, to track multiple zones.
    # auto-trust-anchor-file: ""

    # Trusted key for validation. DS or DNSKEY. specify the RR on a
    # single line, surrounded by "". TTL is ignored. class is IN default.
    # (These examples are from August 2007 and may not be valid anymore).
    # trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5 AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp86Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ=="
    # trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"

    # File with trusted keys for validation. Specify more than one file
    # with several entries, one file per entry. Like trust-anchor-file
    # but has a different file format. Format is BIND-9 style format,
    # the trusted-keys { name flag proto algo "key"; }; clauses are read.
    # trusted-keys-file: ""
    trusted-keys-file: /etc/unbound/root.key

    # Ignore chain of trust. Domain is treated as insecure.
    # domain-insecure: "example.com"

    # Override the date for validation with a specific fixed date.
    # Do not set this unless you are debugging signature inception
    # and expiration. "" or "0" turns the feature off.
    # val-override-date: ""
    
    # The time to live for bogus data, rrsets and messages. This avoids
    # some of the revalidation, until the time interval expires. in secs.
    # val-bogus-ttl: 60

    # The signature inception and expiration dates are allowed to be off
    # by 10% of the lifetime of the signature from our local clock.
    # This leeway is capped with a minimum and a maximum.  In seconds.
    # val-sig-skew-min: 3600
    # val-sig-skew-max: 86400

    # Should additional section of secure message also be kept clean of
    # unsecure data. Useful to shield the users of this validator from
    # potential bogus data in the additional section. All unsigned data
    # in the additional section is removed from secure messages.
    val-clean-additional: yes
    
    # Turn permissive mode on to permit bogus messages. Thus, messages
    # for which security checks failed will be returned to clients,
    # instead of SERVFAIL. It still performs the security checks, which
    # result in interesting log files and possibly the AD bit in
    # replies if the message is found secure. The default is off.
    # NOTE: TURNING THIS ON DISABLES ALL DNSSEC SECURITY
    val-permissive-mode: no

    # Have the validator log failed validations for your diagnosis.
    # 0: off. 1: A line per failed user query. 2: With reason and bad IP.
    val-log-level: 1
    
    # It is possible to configure NSEC3 maximum iteration counts per
    # keysize. Keep this table very short, as linear search is done.
    # A message with an NSEC3 with larger count is marked insecure.
    # List in ascending order the keysize and count values.
    # val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"

    # instruct the auto-trust-anchor-file probing to add anchors after ttl.
    # add-holddown: 2592000 # 30 days

    # instruct the auto-trust-anchor-file probing to del anchors after ttl.
    # del-holddown: 2592000 # 30 days

    # auto-trust-anchor-file probing removes missing anchors after ttl.
    # If the value 0 is given, missing anchors are not removed.
    # keep-missing: 31622400 # 366 days

    # the amount of memory to use for the key cache.
    # plain value in bytes or you can append k, m or G. default is "4Mb".
    # key-cache-size: 4m

    # the number of slabs to use for the key cache.
    # the number of slabs must be a power of 2.
    # more slabs reduce lock contention, but fragment memory usage.
          key-cache-slabs: 4
    
    # the amount of memory to use for the negative cache (used for DLV).
    # plain value in bytes or you can append k, m or G. default is "1Mb".
    # neg-cache-size: 1m

    # a number of locally served zones can be configured.
    #     local-zone: <zone> <type>
    #     local-data: "<resource record string>"
    # o deny serves local data (if any), else, drops queries.
    # o refuse serves local data (if any), else, replies with error.
    # o static serves local data, else, nxdomain or nodata answer.
    # o transparent serves local data, but resolves normally for other names
    # o redirect serves the zone data for any subdomain in the zone.
    # o nodefault can be used to normally resolve AS112 zones.
    #
    # defaults are localhost address, reverse for 127.0.0.1 and ::1
    # and nxdomain for AS112 zones. If you configure one of these zones
    # the default content is omitted, or you can omit it with 'nodefault'.
    #
    # If you configure local-data without specifying local-zone, by
    # default a transparent local-zone is created for the data.
    #
    # You can add locally served data with
    # local-zone: "local." static
    # local-data: "mycomputer.local. IN A 192.0.2.51"
    # local-data: 'mytext.local TXT "content of text record"'
    #
    # You can override certain queries with
    # local-data: "adserver.example.com A 127.0.0.1"
    #
    # You can redirect a domain to a fixed address with
    # (this makes example.com, www.example.com, etc, all go to 192.0.2.3)
    # local-zone: "example.com" redirect
    # local-data: "example.com A 192.0.2.3"
    #
    # Shorthand to make PTR records, "IPv4 name" or "IPv6 name".
    # You can also add PTR records using local-data directly, but then
    # you need to do the reverse notation yourself.
    # local-data-ptr: "192.0.2.3 www.example.com"

## Python config section. To enable:
## o use --with-pythonmodule to configure before compiling.
## o list python in the module-config string (above) to enable.
## o and give a python-script to run.
#python:
#    # Script file to load
#    # python-script: "/etc/unbound/ubmodule-tst.py"

# Remote control config section.
remote-control:
    # Enable remote control with unbound-control(8) here.
    # set up the keys and certificates with unbound-control-setup.
    # Note: required for unbound-munin package
    control-enable: no

    # what interfaces are listened to for remote control.
    # give 0.0.0.0 and ::0 to listen to all interfaces.
    #  control-interface: 127.0.0.1
    # control-interface: ::1

    # port number for remote control operations.
    #  control-port: 953

    # unbound server key file.
    # server-key-file: ""/etc/unbound/unbound_server.key""

    # unbound server certificate file.
    # server-cert-file: "/etc/unbound/unbound_server.pem"

    # unbound-control key file.
    # control-key-file: "/etc/unbound/unbound_control.key"

    # unbound-control certificate file.
    # control-cert-file: "/etc/unbound/unbound_control.pem"

# Stub zones.
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of nameservers. list zero or more
# nameservers by hostname or by ipaddress. If you set stub-prime to yes,
# the list is treated as priming hints (default is no).
# stub-zone:
#    name: "example.com"
#    stub-addr: 192.0.2.68
#    stub-prime: "no"
# stub-zone:
#    name: "example.org"
#    stub-host: ns.example.com.

# Forward zones
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of servers. These servers have to handle
# recursion to other nameservers. List zero or more nameservers by hostname
# or by ipaddress. Use an entry with name "." to forward all queries.
# forward-zone:
#     name: "example.com"
#     forward-addr: 192.0.2.68
#     forward-addr: 192.0.2.73@5355  # forward to port 5355.
# forward-zone:
#     name: "example.org"
#     forward-host: fwd.example.com