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SubjectRe: [PATCH net-next] softirq: reduce latencies
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On Fri, Jan 4, 2013 at 5:41 AM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Thu, 2013-01-03 at 11:41 -0800, Rick Jones wrote:
>
>> In terms of netperf overhead, once you specify P99_LATENCY, you are
>> already in for the pound of cost but only getting the penny of output
>> (so to speak). While it would clutter the output, one could go ahead
>> and ask for the other latency stats and it won't "cost" anything more:
>>
>> ... -- -k
>> RT_LATENCY,MIN_LATENCY,MAX_LATENCY,P50_LATENCY,P90_LATENCY,P99_LATENCY,MEAN_LATENCY,STDDEV_LATENCY
>>
>> Additional information about how the omni output selectors work can be
>> found at
>> http://www.netperf.org/svn/netperf2/trunk/doc/netperf.html#Omni-Output-Selection
>>
>> happy benchmarking,
>>
>> rick jones
>>
>> BTW - you will likely see some differences between RT_LATENCY, which is
>> calculated from the average transactions per second, and MEAN_LATENCY,
>> which is calculated from the histogram of individual latencies
>> maintained when any of the _LATENCY outputs other than RT_LATENCY is
>> requested. Kudos to the folks at Google who did the extensions to the
>> then-existing histogram code to enable it to be used for more reasonably
>> accurate statistics.
>>
>
> Yeah ;)
>
> Here are the before/after_patch results, cpu 2 handling the NIC irqs :
>
>
> Before patch :
>
> # netperf -H 7.7.7.84 -t TCP_RR -T2,2 -- -k
> 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 7.7.7.84 () port 0 AF_INET : first burst 0 : cpu bind
> RT_LATENCY=550110.424
> MIN_LATENCY=146858
> MAX_LATENCY=997109
> P50_LATENCY=305000
> P90_LATENCY=550000
> P99_LATENCY=710000
> MEAN_LATENCY=376989.12
> STDDEV_LATENCY=184046.92
>
> After patch :
>
> # netperf -H 7.7.7.84 -t TCP_RR -T2,2 -- -k
> 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 7.7.7.84 () port 0 AF_INET : first burst 0 : cpu bind
> RT_LATENCY=40545.492
> MIN_LATENCY=9834
> MAX_LATENCY=78366
> P50_LATENCY=33583
> P90_LATENCY=59000
> P99_LATENCY=69000
> MEAN_LATENCY=38364.67
> STDDEV_LATENCY=12865.26
>

I also wanted to give some numbers.
But with localhost as default (no netserver running on a remote-host)
I am not sure if these numbers give any helpful feedback.
( I have not tested yet w/o your patch. )

- Sedat -
# netperf -H localhost -t TCP_RR -T2,2 -- -k 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 localhost (127.0.0.1) port 0 AF_INET : demo : first burst 0 : cpu bind
RT_LATENCY=11.407
MIN_LATENCY=10
MAX_LATENCY=152
P50_LATENCY=11
P90_LATENCY=12
P99_LATENCY=13
MEAN_LATENCY=11.31
STDDEV_LATENCY=0.95

# netperf -H localhost -t TCP_RR -T2,2 -- -k 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 localhost (127.0.0.1) port 0 AF_INET : demo : first burst 0 : cpu bind
RT_LATENCY=11.364
MIN_LATENCY=10
MAX_LATENCY=156
P50_LATENCY=11
P90_LATENCY=12
P99_LATENCY=13
MEAN_LATENCY=11.27
STDDEV_LATENCY=1.06

# netperf -H localhost -t TCP_RR -T2,2 -- -k 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 localhost (127.0.0.1) port 0 AF_INET : demo : first burst 0 : cpu bind
RT_LATENCY=11.408
MIN_LATENCY=10
MAX_LATENCY=156
P50_LATENCY=11
P90_LATENCY=12
P99_LATENCY=13
MEAN_LATENCY=11.31
STDDEV_LATENCY=1.07

# netperf -H localhost -t TCP_RR -T2,2 -- -k 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 localhost (127.0.0.1) port 0 AF_INET : demo : first burst 0 : cpu bind
RT_LATENCY=11.312
MIN_LATENCY=10
MAX_LATENCY=151
P50_LATENCY=11
P90_LATENCY=12
P99_LATENCY=13
MEAN_LATENCY=11.22
STDDEV_LATENCY=0.94

# netperf -H localhost -t TCP_RR -T2,2 -- -k 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 localhost (127.0.0.1) port 0 AF_INET : demo : first burst 0 : cpu bind
RT_LATENCY=11.345
MIN_LATENCY=10
MAX_LATENCY=159
P50_LATENCY=11
P90_LATENCY=12
P99_LATENCY=13
MEAN_LATENCY=11.25
STDDEV_LATENCY=1.03


-dileks // 04-Jan-2013

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