netdev - Re: [PATCH 0/2 v3] ipv4: Cache dst in tunnels

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Message-ID: <52C5DF71.3080906@hp.com>
Date:	Thu, 02 Jan 2014 13:51:45 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Tom Herbert <therbert@...gle.com>, davem@...emloft.net,
	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH 0/2 v3] ipv4: Cache dst in tunnels

Nothing that calls for a V4, but a couple of nits and such.

On 01/02/2014 11:48 AM, Tom Herbert wrote:
> Without patches
> 71.22% CPU utilization
> 138/180/244 90/95/99% latencies

The netperf version I have, for which I think I faithfully applied the 
patches from Google for the percentiles is 50, 90 and 99.

raj@...dy:~$ netperf -- -O ? | grep -i laten
RT_LATENCY
MIN_LATENCY
MAX_LATENCY
P50_LATENCY
P90_LATENCY
P99_LATENCY
MEAN_LATENCY
STDDEV_LATENCY

> 1.30465e+06 CPU/tps

That is TPS rather than CPU/TPS I am guessing.

> 18318 CPU/tps

TPS/CPU%

>
> With patches
> 69.84%
> 142/186/249 90/95/99% latencies
> 1.30827e+06
> 18732 CPU/tps

Any idea as to the source of the similarly modest increase in the latencies?

Speaking of which, given the overhead of measuring the individual 
latencies, you might try a pair of runs without them being measured and 
see if you show a larger delta in tps and/or CPU utilization.

raj@...dy:~/netperf2_trunk/src$ ./netperf -i 30,3 -t TCP_RR -- -o 
throughput,p50_latency,p90_latency,p99_latency;  ./netperf -i 30,3 -t 
TCP_RR -- -o throughput
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET 
to localhost.localdomain () port 0 AF_INET : +/-2.500% @ 99% conf.  : 
interval : demo : first burst 0
Throughput,50th Percentile Latency Microseconds,90th Percentile Latency 
Microseconds,99th Percentile Latency Microseconds
46248.37,21,22,28
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET 
to localhost.localdomain () port 0 AF_INET : +/-2.500% @ 99% conf.  : 
interval : demo : first burst 0
Throughput
48098.45

A nitpick from the 1/2 email:

> the tunnel is "connected" so that all the rouitng parameters are


happy benchmarking,

rick jones

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