From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Modica Subject: High interrupt rate even when using NAPI Date: Wed, 05 Nov 2003 12:03:46 -0600 Sender: netdev-bounce@oss.sgi.com Message-ID: <3FA93B82.5070508@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: To: netdev@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Hi All, I just noticed some strange behavior with the tg3 driver. Even with NAPI enabled, during high loads of 1500 byte MTUS, I'm seeing a very high interrupt rate. To move 500kBytes/sec I'm seeing 22k interrupts/sec. It tracks very closely with the actualy throughput. That amounts to about 1 interrupt per 23 bytes. I figured with NAPI, we should do a lot better than that. Is there a tuneable or some driver stat that I can track to figure out what's happening here? I'd like to see that interrupt number be a lot lower. Steve -- Steve Modica MTS-Technical Lead "Give a man a fish, and he will eat for a day, hit him with a fish and he leaves you alone" - me