Re: 32 core net-next stack/netfilter "scaling"

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From: Rick Jones
Date: Tuesday, January 27, 2009 - 12:24 pm

>> I will give it a try and let folks know the results - unless told 

The script completed - although at some point I hit an fd limit - I think I have 
an fd leak in netperf somewhere :( .

Anyhow, there are still some netperfs that end-up kicking the bucket during the 
run - I suspect starvation because where in the other configs (no iptables, and 
empty iptables) each netperf seems to consume about 50% of a CPU - stands to 
reason - 64 netperfs, 32 cores - in the "full" case I see many netperfs consuming 
100% of a CPU.  My gut is thinking that one or more netperf contexts gets stuck 
doing something on behalf of others.  There is also ksoftirqd time for a few of 
those processes.

Anyhow, the spread on trans/s/netperf is now 600 to 500 or 6000, which does 
represent an improvement.

rick jones

PS - just to be certain that running-out of fd's didn't skew the results I'm 
rerunning the script with ulimit -n 10240 and will see if that changes the 
results any.  And I suppose I need to go fd leak hunting in netperf omni code :(
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Messages in current thread:
32 core net-next stack/netfilter "scaling", Rick Jones, (Mon Jan 26, 3:15 pm)
Re: 32 core net-next stack/netfilter "scaling", Stephen Hemminger, (Mon Jan 26, 4:14 pm)
Re: 32 core net-next stack/netfilter "scaling", Patrick McHardy, (Tue Jan 27, 2:15 am)
Re: 32 core net-next stack/netfilter "scaling", Patrick McHardy, (Tue Jan 27, 4:37 am)
Re: 32 core net-next stack/netfilter "scaling", Patrick McHardy, (Tue Jan 27, 10:33 am)
Re: 32 core net-next stack/netfilter "scaling", Rick Jones, (Tue Jan 27, 12:24 pm)
Re: 32 core net-next stack/netfilter "scaling", Patrick McHardy, (Wed Jan 28, 9:25 am)
Re: 32 core net-next stack/netfilter "scaling", Eric Dumazet, (Wed Jan 28, 10:07 am)
Re: 32 core net-next stack/netfilter "scaling", Eric Dumazet, (Wed Jan 28, 10:34 am)
Re: 32 core net-next stack/netfilter "scaling", Patrick McHardy, (Mon Feb 9, 7:57 am)
Re: 32 core net-next stack/netfilter "scaling", Stephen Hemminger, (Tue Feb 10, 11:44 am)
[PATCH] netfilter: xt_physdev fixes, Eric Dumazet, (Wed Feb 18, 10:36 am)
Re: [PATCH] netfilter: xt_physdev fixes, Patrick McHardy, (Wed Feb 18, 11:14 am)
[PATCH] netfilter: unfold two loops in physdev_mt(), Eric Dumazet, (Thu Feb 19, 1:00 am)
Re: [PATCH] netfilter: unfold two loops in physdev_mt(), Patrick McHardy, (Thu Feb 19, 3:17 am)