path: root/Documentation
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authorAlexei Starovoitov <ast@plumgrid.com>2015-05-07 16:35:32 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-09 22:26:06 -0400
commit62f64aed622b6055b5fc447e3e421c9351563fc8 (patch)
tree1a4ed4a6daafe1c1c2cc8da74f3e8432e7aa4a11 /Documentation
parentf1f00d8ff60ca056db3805406507483eeb3794d7 (diff)
pktgen: introduce xmit_mode '<start_xmit|netif_receive>'
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" 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: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt
index 6199ee6a040b..747faccc4120 100644
--- a/Documentation/networking/pktgen.txt
+++ b/Documentation/networking/pktgen.txt
@@ -193,6 +193,10 @@ Examples:
pgset "rate 300M" set rate to 300 Mb/s
pgset "ratep 1000000" set rate to 1Mpps
+ pgset "xmit_mode netif_receive" RX inject into stack netif_receive_skb()
+ Works with "burst" but not with "clone_skb".
+ Default xmit_mode is "start_xmit".
Sample scripts
@@ -310,6 +314,9 @@ flowlen
+xmit_mode <start_xmit|netif_receive>

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