From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felix Fietkau Date: Tue, 05 Apr 2011 17:59:13 +0200 Subject: [ath9k-devel] ath9k performance issues In-Reply-To: <20110405154421.GA11830@regiomontanus> References: <20110405154421.GA11830@regiomontanus> Message-ID: <4D9B3C51.8080209@openwrt.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org On 2011-04-05 5:44 PM, Bernhard Walle wrote: > Hello, > > we're using a PCIe AR9280 card on a Octeon MIPS CPU. The system > that does the transmission has a high CPU utilization: > > iperf in UDP mode with 50M bandwith has ~90 % CPU utilization with a > high softirq proportion. > > Using an Intel card (5300) has a lower CPU utilization (~60 %), but it's > no option to use it because the Linux driver has no access point mode. > > Are there any tweaks to decrease the CPU utilization with the ath9k > driver? Any recommendations for the application to send the network > packets more efficient? What kernel version are you using? Are you using the in-kernel ath9k or are you using compat-wireless? I have added quite a few performance optimizations over time, as I'm working with much slower MIPS CPUs than the octeon. In my tests, a 300 MHz MIPS 24K CPU is good enough for handling around 90 mbit/s of traffic with only around 70% CPU utilization. - Felix