From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: Poor gige performance with 2.4.20-pre* Date: Sat, 28 Sep 2002 19:32:54 -0700 Sender: netdev-bounce@oss.sgi.com Message-ID: <3D966656.7040205@candelatech.com> References: <200209282257.g8SMvta32527@vindaloo.ras.ucalgary.ca> 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: Richard Gooch Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Richard Gooch wrote: > Hi, all. For a while now I've noticed poor performance with gige > cards under 2.4.19 and 2.4.20-pre*. At first I thought it was because > of the cheap-ass Addtron cards I bought (these use the ns83820 chip). > But now that the Intel E1000 cards are pretty cheap too, I've grabbed > a couple (part number: PWLA8390MT) and see the same problem. In fact, > the E1000 cards are no better than the Addtron cards. I'm using the > D-Link DGS-1008T 8-port gige switch. MTU=1500 bytes. Machine: dual Athlon, 1.66Ghz, 64/66Mhz pci, 512MB RAM, 2 Intel PRO/1000 MT server NICs. Kernel: 2.4.20-pre7, pre8 (same behaviour) I was able to send and receive 400Mbps between two cards on the machine simultaneously. This is sustained over a period of time untill the box crashes after an hour or so :( Using pktgen, I could generate 860Mbps in one direction from one port to another on the same machine (crashed after an hour or so here too). Try setting the TxDescriptors=4096 RxDescriptors=1024 when loading the e1000 module, that helps tremendously when using smaller packets. I tried the e1000 driver in 2.5.38 on the machine, it ran at about 1/3 of the speed, and crashed in under 5 minutes... So, the performance could be better, but what is really killing me is stability at this point... > > The basic test I do is to send 100 MB over a TCP connection from one > machine to the other. The results are: > > Dual PIII 450 MHz -> Dual Athalon 1.6 GHz yields 58 MB/s > Dual Athalon 1.6 GHz -> Dual PIII 450 MHz yields 23 MB/s > > This is quite a bit less than what gige is supposed to give. Is this > expected? > > Regards, > > Richard.... > Permanent: rgooch@atnf.csiro.au > Current: rgooch@ras.ucalgary.ca > -- Ben Greear President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear