From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 1 Jun 2001 01:11:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 1 Jun 2001 01:11:08 -0400 Received: from cx97923-a.phnx3.az.home.com ([24.9.112.194]:12303 "EHLO grok.yi.org") by vger.kernel.org with ESMTP id ; Fri, 1 Jun 2001 01:10:58 -0400 Message-ID: <3B1726B3.6ED0872C@candelatech.com> Date: Thu, 31 May 2001 22:22:59 -0700 From: Ben Greear Organization: Candela Technologies X-Mailer: Mozilla 4.76 [en] (X11; U; Linux 2.2.17-14 i686) X-Accept-Language: en MIME-Version: 1.0 To: John William CC: linux-kernel@vger.kernel.org Subject: Re: Abysmal RECV network performance In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org John William wrote: > > >Depends on what is driving it... An application I built can only push > >about > >80 Mbps bi-directional on PII 550Mhz machines. It is not the most > >efficient program in > >the world, but it isn't too bad either... > > > >I missed the rest of this thread, so maybe you already mentioned it, but > >what is the bottleneck? Is your CPU running at 100%? > > > >Greatly increasing the buffers both in the drivers and in the sockets > >does wonders for higher-speed connections, btw. > > > >Ben > > I don't know what the bottleneck is. What I'm seeing is ~60Mbps transmit > speed and anywhere from 1 to 12Mpbs receive speed on a couple 10/100 cards > using the 2.2.16, 2.2.19 and 2.4.3 kernels. > > I have tried increasing the size of the RX ring buffer and it did not seem > to make any difference. It appears that there is some sort of overrun or > other problem. There is a significant slowdown between the 2.2.x and 2.4.x > kernels. > > However, just tonight, while really hammering on the system, I started to > get some messages like "eth1: Oversized Ethernet frame spanned multiple > buffers, status 7fff8301!". Any ideas what could be causing that? Nope, I'd take it up with the driver developers. For what it's worth, the Intel Ether-Express Pro cards are the only ones I've found yet that really work right at high speeds. Intel's e100 driver seems to work really well for me, but the eepro driver also works well with most versions of the eepro cards I've used... I have had definate problems with the natsemi (locked up), tulip (won't autonegotiate multi-port cards correctly, or something), rtl8139 (would lock up, haven't tried recent drivers though).... I used to assume that Linux had the best/fastest networking support around, but the reality is that I've had a really hard time finding hardware/drivers that works at high speeds (60Mbps+, bi-directional). -- Ben Greear President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear