From mboxrd@z Thu Jan 1 00:00:00 1970 From: jamal Subject: Re: RFC: NAPI packet weighting patch Date: Wed, 22 Jun 2005 15:37:46 -0400 Message-ID: <1119469066.6918.168.camel@localhost.localdomain> References: <42A5284C.3060808@osdl.org> <1118147904.6320.108.camel@localhost.localdomain> <20050621.133704.08321534.davem@davemloft.net> <42B92490.40005@draigBrady.com> Reply-To: hadi@cyberus.ca Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , gandalf@wlug.westbo.se, shemminger@osdl.org, mitch.a.williams@intel.com, john.ronciak@intel.com, mchan@broadcom.com, buytenh@wantstofly.org, jdmason@us.ibm.com, netdev@oss.sgi.com, Robert.Olsson@data.slu.se, ganesh.venkatesan@intel.com, jesse.brandeburg@intel.com Return-path: To: P@draigBrady.com In-Reply-To: <42B92490.40005@draigBrady.com> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Wed, 2005-22-06 at 09:42 +0100, P@draigBrady.com wrote: > > Yes the copy is essentially free here as the data is already cached. > > As a data point, I went the whole hog and used buffer recycling > in my essentially packet sniffing application. I.E. there are no > allocs per packet at all, and this make a HUGE difference. On a > 2x3.4GHz 2xe1000 system I can receive 620Kpps per port sustained > into my userspace app which does a LOT of processing per packet. > Without the buffer recycling is was around 250Kpps. > Note I don't reuse an skb until the packet is copied into a > PACKET_MMAP buffer. Was this machine SMP? NAPI involved? I take it nothing interfering in the middle with the headers? cheers, jamal