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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <497F8BDA.6080908@cosmosbay.com>
Date:	Tue, 27 Jan 2009 23:34:02 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Rick Jones <rick.jones2@...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"

Rick Jones a écrit :
>
>> 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
>
>

By any chance, are you using SLAB instead of SLUB ?

While running your netperf session, issuing :

grep conntrack /proc/slabinfo

Would help to know hash dispertion on your machine.


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html