Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267664AbUIFIzz (ORCPT ); Mon, 6 Sep 2004 04:55:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266341AbUIFIzz (ORCPT ); Mon, 6 Sep 2004 04:55:55 -0400 Received: from smtp204.mail.sc5.yahoo.com ([216.136.130.127]:44128 "HELO smtp204.mail.sc5.yahoo.com") by vger.kernel.org with SMTP id S267678AbUIFIzZ (ORCPT ); Mon, 6 Sep 2004 04:55:25 -0400 Message-ID: <413C25F4.8030501@yahoo.com.au> Date: Mon, 06 Sep 2004 18:55:16 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040810 Debian/1.7.2-2 X-Accept-Language: en MIME-Version: 1.0 To: "David S. Miller" CC: anton@samba.org, akpm@osdl.org, torvalds@osdl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat References: <413AA7B2.4000907@yahoo.com.au> <20040904230939.03da8d2d.akpm@osdl.org> <20040905062743.GG7716@krispykreme> <413AE5DA.9070208@yahoo.com.au> <20040905203331.7a2a2fad.davem@davemloft.net> In-Reply-To: <20040905203331.7a2a2fad.davem@davemloft.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1200 Lines: 32 David S. Miller wrote: > On Sun, 05 Sep 2004 20:09:30 +1000 > Nick Piggin wrote: > > >>Yeah I had seen a few, surprisingly few though. Sorry I'm a bit clueless >>about networking - I suppose there is a good reason for the 16K MTU? My >>first thought might be that a 4K one could be better on CPU cache as well >>as lighter on the mm. I know the networking guys know what they're doing >>though... > > > It's better to get as long a stride as possible for the copy > from userspace, and yes as you get larger you run into cache > issues. 16K turned out the be the break point considering those > two attributes when I did my testing. > OK. Makes sense. > Just fool around with ifconfig lo mtu XXX and TCP bandwidth tests. > See what you come up with. > Thanks, I'll give that a try. I don't nearly have access to a representitive range of architectures, but if I see anything interesting on what I've got, I'll ping you. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/