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

To: "Catalin(ux) M. BOIE" <catab@xxxxxxxxxxxxx>
Subject: Re: [PATCH] IPVS: Allow boot time change of hash size.
Cc: netdev@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Thu, 27 Nov 2008 07:58:56 -0800 (PST)
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


Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at
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