From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 5 Sep 2004 20:33:31 -0700 From: "David S. Miller" Subject: Re: [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat Message-Id: <20040905203331.7a2a2fad.davem@davemloft.net> In-Reply-To: <413AE5DA.9070208@yahoo.com.au> References: <413AA7B2.4000907@yahoo.com.au> <20040904230939.03da8d2d.akpm@osdl.org> <20040905062743.GG7716@krispykreme> <413AE5DA.9070208@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: anton@samba.org, akpm@osdl.org, torvalds@osdl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: 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. Just fool around with ifconfig lo mtu XXX and TCP bandwidth tests. See what you come up with. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org