From: Patrick McHardy <kaber@trash.net>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Anand Raj Manickam <anandrm@gmail.com>, netfilter-devel@vger.kernel.org
Subject: Re: Any Performance benchmark on a Million conntracks
Date: Thu, 20 May 2010 16:03:55 +0200 [thread overview]
Message-ID: <4BF5414B.4090609@trash.net> (raw)
In-Reply-To: <1274360664.4046.36.camel@edumazet-laptop>
Eric Dumazet wrote:
> Le jeudi 20 mai 2010 à 18:21 +0530, Anand Raj Manickam a écrit :
>> Hi,
>> Is there any performance bench mark on conntrack response to 1 million
>> conntrack entries in the conntrack table.
>> Since conntrack uses Hashing to lookup the entries i had some doubts
>> on the scalability. Can someone shed some light please?
>
> Question is not about number of conntrack entries in hash table, but
> number of inserts and deletes per second.
>
> For persistent connections, if you use a hash table of one million
> slots, performance will be very good, since the chain length is small.
> Its scalable because each cpu can access conntrack table without locks,
> in parallel.
Actually the recommended hash table size is twice the number of
expected connections since each conntrack is hashed twice :)
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next prev parent reply other threads:[~2010-05-20 14:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 12:51 Any Performance benchmark on a Million conntracks Anand Raj Manickam
2010-05-20 13:04 ` Eric Dumazet
2010-05-20 14:03 ` Patrick McHardy [this message]
2010-05-20 17:13 ` Anand Raj Manickam
2010-05-20 17:44 ` Eric Dumazet
2010-05-20 23:43 ` Changli Gao
2010-05-21 2:34 ` Eric Dumazet
2010-05-21 3:06 ` Changli Gao
2010-05-21 14:05 ` Simon Lodal
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