netdev - Re: [PATCH] IPVS: Allow boot time change of hash size.

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Message-ID: <Pine.LNX.4.64.0811270754290.32640@wm7d.net>
Date:	Thu, 27 Nov 2008 07:58:56 -0800 (PST)
From:	Joseph Mack NA3T <jmack@...d.net>
To:	"Catalin(ux) M. BOIE" <catab@...edromix.ro>
cc:	netdev@...r.kernel.org, lvs-devel@...r.kernel.org
Subject: Re: [PATCH] IPVS: Allow boot time change of hash size.

On Wed, 26 Nov 2008, Catalin(ux) M. BOIE wrote:

>> Why do you need to change the hash size? We really don't
>> recommend anyone do this under normal circumstances
>
> As it is written in the help, to lower the collisions in 
> the case of a lot of concurrent connections. Or am I 
> missing something?

not sure how big the collision problem is (have you measured 
an effect?) but Ratz put out the results of a back of the 
envelope calculation that the current value for the hash 
table size would work on the currect fastest machines with 
3G of memory

Joe

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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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