From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Subject: Re: [PATCH] Increase snd/rcv buffers in pppoe Date: Sun, 22 Feb 2004 23:26:01 -0800 Sender: netdev-bounce@oss.sgi.com Message-ID: <20040222232601.481b8c57.davem@redhat.com> References: <20040222234750.GA78924@colin2.muc.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@oss.sgi.com, mostrows@styx.uwaterloo.ca Return-path: To: Andi Kleen In-Reply-To: <20040222234750.GA78924@colin2.muc.de> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On 23 Feb 2004 00:47:50 +0100 Andi Kleen wrote: > I noticed that a 64bit kernel only downloads half as fast over a PPPoE DSL > connection than a 32bit kernel on the same hardware. The reason seems > to be that PPPoE uses the default 64K snd/rcv buffers at socket creation. > The bigger sk_buff header size on the 64bit kernel pushed > the buffer into being too small and preventing good throughput. I have no problem with this, but hey while we're at it why not do the same for the core defaults instead? I see no real harm in this at all as it's not a pppoe specific issue. What say you Andi?