Automated cherry pick of #2458: Use ChainExists to reduce memory footprint #2501
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ListChains was used to check if a chain exists. The method used "iptables -t TABLE -S" to list all rules and filter chains from the output. If there are massive iptables chains and rules configured, it would cause a lot of space allocated. benchmark comparison (with 15K iptables rules configured for 1000 services, each of which has 3 endpoints): name old time/op new time/op delta EnsureChain-48 78.2ms ± 3% 27.0ms ± 1% -65.43% (p=0.008 n=5+5) name old alloc/op new alloc/op delta EnsureChain-48 6.06MB ± 0% 0.01MB ± 0% -99.84% (p=0.016 n=4+5) name old allocs/op new allocs/op delta EnsureChain-48 4.16k ± 0% 0.04k ± 0% ~ (p=0.079 n=4+5) Signed-off-by: Quan Tian <qtian@vmware.com>
tnqn
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Codecov Report
@@ Coverage Diff @@
## release-1.2 #2501 +/- ##
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+ Coverage 59.67% 59.89% +0.22%
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Files 284 284
Lines 22171 22168 -3
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+ Hits 13231 13278 +47
+ Misses 7524 7473 -51
- Partials 1416 1417 +1
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antoninbas
approved these changes
Jul 30, 2021
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Cherry pick of #2458 on release-1.2.
#2458: Use ChainExists to reduce memory footprint
For details on the cherry pick process, see the cherry pick requests page.