netdev - Re: [PATCH] net: Saner thash_entries default with much memory

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Message-ID: <20071026155530.GG1114@sgi.com>
Date:	Fri, 26 Oct 2007 08:55:30 -0700
From:	akepner@....com
To:	Jean Delvare <jdelvare@...e.de>
Cc:	netdev@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Robert.Olsson@...a.slu.se
Subject: Re: [PATCH] net: Saner thash_entries default with much memory

On Fri, Oct 26, 2007 at 05:21:31PM +0200, Jean Delvare wrote:
> ....
> This is just one way to limit the hash size, there are others; I am not
> familiar enough with the TCP code to decide which is best. Thus, I
> would welcome the proposals of alternatives.
> 

Yeah, the existing way of sizing them is very bad on large systems 
and hardcoding a size sucks (though that's what we do on large 
Altix systems now).

IIRC there was some talk about using a different data structure 
here - something that wouldn't require a fixed size and that 
could maintain reasonably fast lookup even when it got large. 

Robert, has work been done to use TRASH to address this problem? 
Other ideas?

-- 
Arthur

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