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

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Hash Suite for Android: free password hash cracker in your pocket

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Date:	Tue, 27 Jan 2009 14:29:33 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Netfilter Developers <netfilter-devel@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Network Development list <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: 32 core net-next stack/netfilter "scaling"


> Thanks for the report
> 
> If you have so much contention on spinlocks, maybe hash function is not 
> good at all...
> 
> hash = (unsigned long)ct;
> hash ^= hash >> 16;
> hash ^= hash >> 8;
> 
> I ass-u-me you compiled your kernel with NR_CPUS=32 ?

I believe so - CONFIG_NR_CPUS in .config is 64 anyway.  If there is a more 
definitive place to check I'd be happy to look.

rick

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