All,
First, my apologies if this came up previously but I couldn't find
anything using a keyword search of the mailing list archive.
As part of the on going work with web10g I need to come up with baseline
TCP stack performance for various kernel revision. Using netperf and
super_netperf* I've found that performance for TCP_CC, TCP_RR, and
TCP_CRR has decreased since 3.14.
3.14 3.18 4.0 decrease %
TCP_CC 183945 179222 175793 4.4%
TCP_RR 594495 585484 561365 5.6%
TCP_CRR 98677 96726 93026 5.7%
Stream tests have remained the same from 3.14 through 4.0.
All tests were conducted on the same platform from clean boot with stock
kernels.
So my questions are:
Has anyone else seen this or is this a result of some weirdness on my
system or artifact of my tests?
If others have seen this or is just simply to be expected (from new
features and the like) is it due to the TCP stack itself or other
changes in the kernel?
If so, is there anyway to mitigate the effect of this via stack tuning,
kernel configuration, etc?
Thanks!
Chris
* The above results are the average of 10 iterations of super_netperf
for each test. I can run more iterations to verify the results but it
seem consistent. The number of parallel processes for each test was
tuned to produce the maximum test result. In other words, enough to push
things but not enough to cause performance hits due to being
cpu/memory/etc bound. If anyone wants the full results and test scripts
just let me know.
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