linux-kernel - Re: [take13 1/3] kevent: Core files.

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Message-Id: <20060825001314.b320b10a.akpm@osdl.org>
Date:	Fri, 25 Aug 2006 00:13:14 -0700
From:	Andrew Morton <akpm@...l.org>
To:	David Miller <davem@...emloft.net>
Cc:	johnpol@....mipt.ru, hch@...radead.org,
	linux-kernel@...r.kernel.org, drepper@...hat.com,
	netdev@...r.kernel.org, zach.brown@...cle.com
Subject: Re: [take13 1/3] kevent: Core files.

On Fri, 25 Aug 2006 00:01:06 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Andrew Morton <akpm@...l.org>
> Date: Thu, 24 Aug 2006 23:20:24 -0700
> 
> > On Fri, 25 Aug 2006 09:48:15 +0400
> > Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> > 
> > > kmalloc is really slow actually - it always shows somewhere on top 
> > > in profiles and brings noticeble overhead
> > 
> > It shouldn't.  Please describe the workload and send the profiles.
> 
> Not that I can account for the problem in this specific case, in my
> experience cutting down kmalloc() calls matters a _lot_ performance
> wise.
> 
> For example, this is why we allocate TCP sockets as one huge blob
> instead of 3 seperate allocations (generic socket, IP socket, TCP
> socket).
> 
> In fact, one of the remaining performance issues in IPSEC rule
> creation is that we allocate seperately hunks of memory for the rule's
> encryption state, the optional hash algorithm state, etc.

Part of that will be cache sharing between the three structs though.
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