On Feb 9, 2011, at 9:56 AM, Joe Perches wrote:
> On Wed, 2011-02-09 at 09:24 +0100, Anders Berggren wrote:
>> Our hardware ping, using Intel 82580 NICs,
>> have an accuracy of 8 nanoseconds.
>
> Perhaps you mean 8 nanosecond resolution?
> Is documentation available for this claim?
Well, both. 8 ns is the accuracy when performing RTT (round-trip time)
measurements using our hardware ping tool. We tested it by connecting a 10 m
(European meters ;) CAT6 copper and measuring the jitter. The RTT is always
1240 ns or 1248 ns, hence the accuracy of 8 ns.
$ sudo ./probed -c 10.10.10.3 -i eth2 -p 666
SLA-NG probed 0.1
probed: Binding port 666
probed: Using hardware timestamps
probed: client: ::ffff:10.10.10.3: Connecting to port 666
probed: client: ::ffff:10.10.10.3: Connected
Response 1 from 0 in 1240 ns
Response 2 from 0 in 1248 ns
Response 3 from 0 in 1248 ns
Response 4 from 0 in 1248 ns
^C
4 ok, 0 ts err, 0 lost pong, 0 timeout, 0 dup, 0.000000% loss
max: 1248 ns, avg: 1246 ns, min: 1240 ns
This is our tool:
$ ./probed
SLA-NG probed 0.1
usage: probed [-saqd] [-c addr] [-t type] [-i iface] [-p port] [-f file]
MODES OF OPERATION
-c addr Client mode: PING 'addr', fetch UDP timestamps
-s Server mode: respond to PING, send UDP timestamps
-d Daemon mode: both server and client, output to pipe
OPTIONS
-k Create timestamps in kernel driver instead of hardware
-u Create timestamps in userland instead of hardware
-i iface Network interface used for hardware timestamping
-p port UDP port, both source and destination
-w usecs Client mode wait time between PINGs, in microseconds
-v Output more debugging
-q Be quiet, log error to syslog only
-f file Path to configuration file
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