From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael Chan" Subject: Re: BCM5704 performance questions. Date: Thu, 09 Jun 2005 16:56:16 -0700 Message-ID: <1118361376.5838.20.camel@rh4> References: <42A8E0FE.3020708@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "'netdev@oss.sgi.com'" Return-path: To: "Ben Greear" In-Reply-To: <42A8E0FE.3020708@candelatech.com> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Thu, 2005-06-09 at 17:38 -0700, Ben Greear wrote: > > * Is the BCM5704 chipset/driver really that much slower? > Unfortunately, the 5704 requires the "ONE_DMA" workaround which will limit throughput in a PCIX 100/133 bus. If you comment out the line that sets the DMA_RWCTRL_ONE_DMA flag in tg3.c, you should see improved performance. However, you may run into some DMA issues on certain systems. > * Is there some information on tuning the tg3 somewhere? > (I didn't see a Documentation/networking/tg3.txt file, for instance) > > * Is there a way to verify the bus speed that the NIC is running at? > (ethtool -d ethX gives lots of meaningless (to me) hex) > tg3 probing string for each device will tell you the bus type, width, and speed.