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pktgen: document ability to add same device to several threads

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commit 2a1ddf27e8189e1d68336c55dd2f305b224ae8f1 upstream.

The pktgen.txt documentation still claimed that adding same device to
multiple threads were not supported, but it have been since 2008 via
commit e6fce5b916 ("pktgen: multiqueue etc.").

Document this and describe the naming scheme dev@X, as the procfile name
still need to be unique.

Fixes: e6fce5b916 ("pktgen: multiqueue etc.")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Jesper Dangaard Brouer 2015-05-21 12:16:40 +02:00 committed by Zefan Li
parent 5653e9020e
commit 5d78b58c63
1 changed files with 49 additions and 28 deletions
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77
Documentation/networking/pktgen.txt
View file

@ -24,17 +24,33 @@ For monitoring and control pktgen creates:
/proc/net/pktgen/ethX
Viewing threads
===============
/proc/net/pktgen/kpktgend_0
Name: kpktgend_0 max_before_softirq: 10000
Running:
Stopped: eth1
Result: OK: max_before_softirq=10000
Kernel threads
==============
Pktgen creates a thread for each CPU with affinity to that CPU.
Which is controlled through procfile /proc/net/pktgen/kpktgend_X.
Most important the devices assigned to thread. Note! A device can only belong
to one thread.
Example: /proc/net/pktgen/kpktgend_0
Running:
Stopped: eth4@0
Result: OK: add_device=eth4@0
Most important are the devices assigned to the thread.
The two basic thread commands are:
* add_device DEVICE@NAME -- adds a single device
* rem_device_all -- remove all associated devices
When adding a device to a thread, a corrosponding procfile is created
which is used for configuring this device. Thus, device names need to
be unique.
To support adding the same device to multiple threads, which is useful
with multi queue NICs, a the device naming scheme is extended with "@":
device@something
The part after "@" can be anything, but it is custom to use the thread
number.
Viewing devices
===============
@ -42,29 +58,32 @@ Viewing devices
Parm section holds configured info. Current hold running stats.
Result is printed after run or after interruption. Example:
/proc/net/pktgen/eth1
/proc/net/pktgen/eth4@0
Params: count 10000000 min_pkt_size: 60 max_pkt_size: 60
frags: 0 delay: 0 clone_skb: 1000000 ifname: eth1
Params: count 100000 min_pkt_size: 60 max_pkt_size: 60
frags: 0 delay: 0 clone_skb: 64 ifname: eth4@0
flows: 0 flowlen: 0
dst_min: 10.10.11.2 dst_max:
src_min: src_max:
src_mac: 00:00:00:00:00:00 dst_mac: 00:04:23:AC:FD:82
udp_src_min: 9 udp_src_max: 9 udp_dst_min: 9 udp_dst_max: 9
src_mac_count: 0 dst_mac_count: 0
Flags:
Current:
pkts-sofar: 10000000 errors: 39664
started: 1103053986245187us stopped: 1103053999346329us idle: 880401us
seq_num: 10000011 cur_dst_mac_offset: 0 cur_src_mac_offset: 0
cur_saddr: 0x10a0a0a cur_daddr: 0x20b0a0a
cur_udp_dst: 9 cur_udp_src: 9
queue_map_min: 0 queue_map_max: 0
dst_min: 192.168.81.2 dst_max:
src_min: src_max:
src_mac: 90:e2:ba:0a:56:b4 dst_mac: 00:1b:21:3c:9d:f8
udp_src_min: 9 udp_src_max: 109 udp_dst_min: 9 udp_dst_max: 9
src_mac_count: 0 dst_mac_count: 0
Flags: UDPSRC_RND NO_TIMESTAMP QUEUE_MAP_CPU
Current:
pkts-sofar: 100000 errors: 0
started: 623913381008us stopped: 623913396439us idle: 25us
seq_num: 100001 cur_dst_mac_offset: 0 cur_src_mac_offset: 0
cur_saddr: 192.168.8.3 cur_daddr: 192.168.81.2
cur_udp_dst: 9 cur_udp_src: 42
cur_queue_map:
flows: 0
Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags)
763292pps 390Mb/sec (390805504bps) errors: 39664
Result: OK: 15430(c15405d25) usec, 100000 (60byte,0frags)
6480562pps 3110Mb/sec (3110669760bps) errors: 0
Configuring threads and devices
================================
Configuring devices
===================
This is done via the /proc interface easiest done via pgset in the scripts
Examples:
@ -177,6 +196,8 @@ Note when adding devices to a specific CPU there good idea to also assign
/proc/irq/XX/smp_affinity so the TX-interrupts gets bound to the same CPU.
as this reduces cache bouncing when freeing skb's.
Plus using the device flag QUEUE_MAP_CPU, which maps the SKBs TX queue
to the running threads CPU (directly from smp_processor_id()).
Current commands and configuration options
==========================================