Kennedy, Paul <[email protected]> wrote:
> I heard a rumour the ethernet port on the pi is serviced as part of the
> USB port, and has a 1 millisecond interrupt interval. I tried to read
> up on this, and did see something to that effect, but it is still very
> vague to me.
It may be that the pi's CPU hasn't the "oomph" to get > 1000
transactions per second on such a test anyway, but perhaps you could
try a netperf TCP_RR test to the pi and see what transaction rate it
reports.
Just be certain to have the same rev of netperf on both sides (the pi
and the load generator), start netserver on the pi (./netserver) and
initiate the test from the load generator:
netperf -H <pi> -l 30 -t TCP_RR -v 2
if you ./configure --enable-histogram when you build netperf on the
load generator, it will then give you a histogram of the individual
RTTs:
$ src/netperf -H raj-8510w -t TCP_RR -v 2
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
raj-8510w.local () port 0 AF_INET : histogram : demo : first burst 0
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
16384 87380 1 1 10.00 9473.34
16384 87380
Alignment Offset RoundTrip Trans Throughput
Local Remote Local Remote Latency Rate 10^6bits/s
Send Recv Send Recv usec/Tran per sec Outbound Inbound
8 0 0 0 105.559 9473.336 0.076 0.076
Histogram of request/response times
UNIT_USEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
TEN_USEC : 0: 0: 0: 0: 0: 0: 0: 0: 4827: 73601
HUNDRED_USEC : 0: 15124: 1095: 47: 12: 7: 4: 4: 1: 2
UNIT_MSEC : 0: 6: 1: 1: 1: 1: 1: 0: 0: 0
TEN_MSEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
HUNDRED_MSEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
UNIT_SEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
TEN_SEC : 0: 0: 0: 0: 0: 0: 0: 0: 0: 0
>100_SECS: 0
HIST_TOTAL: 94735
You can use omni output selection to get the various percentiles
directly:
$ src/netperf -H raj-8510w -t TCP_RR -- -o
rt_latency,min_latency,max_latency,p50_latency,p90_latency,p99_latency,mean_latency,stddev_latency
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
raj-8510w.local () port 0 AF_INET : histogram : demo : first burst 0
Round Trip Latency usec/tran,Minimum Latency Microseconds,Maximum Latency
Microseconds,50th Percentile Latency Microseconds,90th Percentile Latency
Microseconds,99th Percentile Latency Microseconds,Mean Latency
Microseconds,Stddev Latency Microseconds
105.483,82,8103,97,135,205,105.16,58.10
rick jones
--
the road to hell is paved with business decisions...
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
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