From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: BCM5704 performance questions. Date: Fri, 10 Jun 2005 15:35:35 -0700 Message-ID: <42AA15B7.8050407@candelatech.com> References: <42A8E0FE.3020708@candelatech.com> <1118361376.5838.20.camel@rh4> <42A8EBDA.6010306@candelatech.com> <1118363861.5838.29.camel@rh4> <42AA016C.9050801@candelatech.com> <1118438203.5294.7.camel@rh4> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: "'netdev@oss.sgi.com'" Return-path: To: Michael Chan In-Reply-To: <1118438203.5294.7.camel@rh4> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Michael Chan wrote: > On Fri, 2005-06-10 at 14:09 -0700, Ben Greear wrote: >>I commented out the code and ran the pktgen test again. It may be a small >>bit better, but not much: 770Mbps in one direction, 750Mbps in the other. >> > The latest tg3 driver will print out the dma_rwctrl at probe time. Can > you check the value to make sure ONE_DMA is disabled? Bit 14 sets > ONE_DMA. I don't see any printout in /var/log/messages that looks like it relates to the dma_rwctrl. I'm using the driver in 2.6.11..maybe it is not recent enough to print this information out? >>Have you done any tests with 2 tg3 NICs in a single machine to see if they >>can run at or near line speed (full duplex)? >> > Yes, we have years ago but not with the tg3 driver. We set up the 5704 > to bridge (or route, I don't remember) one port to the other. It cannot > bridge at line-rate with the ONE_DMA workaround enabled. Ok. Do you have other chipsets/NICs that can handle faster GigE speeds? If you'd like to send me some multi-port NICs to play with I'll be happy to report my findings :) Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com