Benjamin LaHaise wrote:
Hello folks,
Here's an updated copy of the patch to use fget_light in net/socket.c.
Rerunning the tests show a drop of ~80Mbit/s on average, which looks
bad until you see the drop in cpu usage from ~89% to ~82%. That will
get fixed in another patch...
Before: max 8113.70, min 8026.32, avg 8072.34
87380 16384 16384 10.01 8045.55 87.11 87.11 1.774 1.774
87380 16384 16384 10.01 8065.14 90.86 90.86 1.846 1.846
87380 16384 16384 10.00 8077.76 89.85 89.85 1.822 1.822
87380 16384 16384 10.00 8026.32 89.80 89.80 1.833 1.833
87380 16384 16384 10.01 8108.59 89.81 89.81 1.815 1.815
87380 16384 16384 10.01 8034.53 89.01 89.01 1.815 1.815
87380 16384 16384 10.00 8113.70 90.45 90.45 1.827 1.827
87380 16384 16384 10.00 8111.37 89.90 89.90 1.816 1.816
87380 16384 16384 10.01 8077.75 87.96 87.96 1.784 1.784
87380 16384 16384 10.00 8062.70 90.25 90.25 1.834 1.834
Average service demand: 1.8166 usecCPU/KB
After: max 8035.81, min 7963.69, avg 7998.14
87380 16384 16384 10.01 8000.93 82.11 82.11 1.682 1.682
87380 16384 16384 10.01 8016.17 83.67 83.67 1.710 1.710
87380 16384 16384 10.01 7963.69 83.47 83.47 1.717 1.717
87380 16384 16384 10.01 8014.35 81.71 81.71 1.671 1.671
87380 16384 16384 10.00 7967.68 83.41 83.41 1.715 1.715
87380 16384 16384 10.00 7995.22 81.00 81.00 1.660 1.660
87380 16384 16384 10.00 8002.61 83.90 83.90 1.718 1.718
87380 16384 16384 10.00 8035.81 81.71 81.71 1.666 1.666
87380 16384 16384 10.01 8005.36 82.56 82.56 1.690 1.690
87380 16384 16384 10.00 7979.61 82.50 82.50 1.694 1.694
Average service demand: 1.6923 usecCPU/KB
So, data transfer efficiency was improved by 6.8%. Nice. And that was
with 16KB sends.
If you trust netperf :) and don't need min and max, you can use the
confidence intervals feature to get it to run until it is 99 or 95%
certain that the reported average is within +/- a percentage of the
"real" average.
The global -I option sets the confidence level and width - eg -I 99,1
would ask to be 99% certain of being +/- 0.5%.
The global -i option sets the minimum and maximum number of iterations
in which to attempt to hit the confidence interval - eg -i 30,3 means
run at least 3 iterations but no more than 30, or -i 10 means run 10
iterations regardless.
IIRC my netperf4-partner-in-crime has it reporting min and max as part
of its confidence intervals support.
http://www.netperf.org/svn/netperf4/trunk/
rick jones
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