1. 28 Apr, 2016 1 commit
  2. 23 May, 2015 5 commits
  3. 10 May, 2015 2 commits
    • Alexei Starovoitov's avatar
      pktgen: introduce xmit_mode '<start_xmit|netif_receive>' · 62f64aed
      Alexei Starovoitov authored
      Introduce xmit_mode 'netif_receive' for pktgen which generates the
      packets using familiar pktgen commands, but feeds them into
      netif_receive_skb() instead of ndo_start_xmit().
      
      Default mode is called 'start_xmit'.
      
      It is designed to test netif_receive_skb and ingress qdisc
      performace only. Make sure to understand how it works before
      using it for other rx benchmarking.
      
      Sample script 'pktgen.sh':
      \#!/bin/bash
      function pgset() {
        local result
      
        echo $1 > $PGDEV
      
        result=`cat $PGDEV | fgrep "Result: OK:"`
        if [ "$result" = "" ]; then
          cat $PGDEV | fgrep Result:
        fi
      }
      
      [ -z "$1" ] && echo "Usage: $0 DEV" && exit 1
      ETH=$1
      
      PGDEV=/proc/net/pktgen/kpktgend_0
      pgset "rem_device_all"
      pgset "add_device $ETH"
      
      PGDEV=/proc/net/pktgen/$ETH
      pgset "xmit_mode netif_receive"
      pgset "pkt_size 60"
      pgset "dst 198.18.0.1"
      pgset "dst_mac 90:e2:ba:ff:ff:ff"
      pgset "count 10000000"
      pgset "burst 32"
      
      PGDEV=/proc/net/pktgen/pgctrl
      echo "Running... ctrl^C to stop"
      pgset "start"
      echo "Done"
      cat /proc/net/pktgen/$ETH
      
      Usage:
      $ sudo ./pktgen.sh eth2
      ...
      Result: OK: 232376(c232372+d3) usec, 10000000 (60byte,0frags)
        43033682pps 20656Mb/sec (20656167360bps) errors: 10000000
      
      Raw netif_receive_skb speed should be ~43 million packet
      per second on 3.7Ghz x86 and 'perf report' should look like:
        37.69%  kpktgend_0   [kernel.vmlinux]  [k] __netif_receive_skb_core
        25.81%  kpktgend_0   [kernel.vmlinux]  [k] kfree_skb
         7.22%  kpktgend_0   [kernel.vmlinux]  [k] ip_rcv
         5.68%  kpktgend_0   [pktgen]          [k] pktgen_thread_worker
      
      If fib_table_lookup is seen on top, it means skb was processed
      by the stack. To benchmark netif_receive_skb only make sure
      that 'dst_mac' of your pktgen script is different from
      receiving device mac and it will be dropped by ip_rcv
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      62f64aed
    • Jesper Dangaard Brouer's avatar
      pktgen: adjust flag NO_TIMESTAMP to be more pktgen compliant · f1f00d8f
      Jesper Dangaard Brouer authored
      Allow flag NO_TIMESTAMP to turn timestamping on again, like other flags,
      with a negation of the flag like !NO_TIMESTAMP.
      
      Also document the option flag NO_TIMESTAMP.
      
      Fixes: afb84b62 ("pktgen: add flag NO_TIMESTAMP to disable timestamping")
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f1f00d8f
  4. 24 Feb, 2015 4 commits
  5. 02 Oct, 2014 1 commit
  6. 01 Jul, 2014 1 commit
    • Jesper Dangaard Brouer's avatar
      pktgen: document tuning for max NIC performance · 9ceb87fc
      Jesper Dangaard Brouer authored
      Using pktgen I'm seeing the ixgbe driver "push-back", due TX ring
      running full.  Thus, the TX ring is artificially limiting pktgen.
      (Diagnose via "ethtool -S", look for "tx_restart_queue" or "tx_busy"
      counters.)
      
      Using ixgbe, the real reason behind the TX ring running full, is due
      to TX ring not being cleaned up fast enough. The ixgbe driver combines
      TX+RX ring cleanups, and the cleanup interval is affected by the
      ethtool --coalesce setting of parameter "rx-usecs".
      
      Do not increase the default NIC TX ring buffer or default cleanup
      interval.  Instead simply document that pktgen needs special NIC
      tuning for maximum packet per sec performance.
      
      Performance results with pktgen with clone_skb=100000.
      TX ring size 512 (default), adjusting "rx-usecs":
       (Single CPU performance, E5-2630, ixgbe)
       - 3935002 pps - rx-usecs:  1 (irqs:  9346)
       - 5132350 pps - rx-usecs: 10 (irqs: 99157)
       - 5375111 pps - rx-usecs: 20 (irqs: 50154)
       - 5454050 pps - rx-usecs: 30 (irqs: 33872)
       - 5496320 pps - rx-usecs: 40 (irqs: 26197)
       - 5502510 pps - rx-usecs: 50 (irqs: 21527)
      
      TX ring size adjusting (ethtool -G), "rx-usecs==1" (default):
       - 3935002 pps - tx-size:  512
       - 5354401 pps - tx-size:  768
       - 5356847 pps - tx-size: 1024
       - 5327595 pps - tx-size: 1536
       - 5356779 pps - tx-size: 2048
       - 5353438 pps - tx-size: 4096
      
      Notice after commit 6f25cd47 (pktgen: fix xmit test for BQL enabled
      devices) pktgen uses netif_xmit_frozen_or_drv_stopped() and ignores
      the BQL "stack" pause (QUEUE_STATE_STACK_XOFF) flag.  This allow us to put
      more pressure on the TX ring buffers.
      
      It is the ixgbe_maybe_stop_tx() call that stops the transmits, and
      pktgen respecting this in the call to netif_xmit_frozen_or_drv_stopped(txq).
      Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9ceb87fc
  7. 24 Feb, 2014 1 commit
  8. 03 Jan, 2014 1 commit
  9. 12 Jun, 2010 1 commit
  10. 05 Oct, 2009 1 commit
    • Eric Dumazet's avatar
      pktgen: Fix multiqueue handling · 896a7cf8
      Eric Dumazet authored
      It is not currently possible to instruct pktgen to use one selected tx queue.
      
      When Robert added multiqueue support in commit 45b270f8, he added
      an interval (queue_map_min, queue_map_max), and his code doesnt take
      into account the case of min = max, to select one tx queue exactly.
      
      I suspect a high performance setup on a eight txqueue device wants
      to use exactly eight cpus, and assign one tx queue to each sender.
      
      This patchs makes pktgen select the right tx queue, not the first one.
      
      Also updates Documentation to reflect Robert changes.
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarRobert Olsson <robert.olsson@its.uu.se>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      896a7cf8
  11. 30 Nov, 2006 2 commits
  12. 03 Oct, 2006 3 commits
  13. 29 Sep, 2006 1 commit
  14. 30 Jun, 2006 1 commit
  15. 23 Mar, 2006 1 commit
  16. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4