Return-path: Received: from nm20.bullet.mail.bf1.yahoo.com ([98.139.212.179]:32420 "HELO nm20.bullet.mail.bf1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753411Ab1FVOqn convert rfc822-to-8bit (ORCPT ); Wed, 22 Jun 2011 10:46:43 -0400 References: <1308750102.64154.YahooMailRC@web161214.mail.bf1.yahoo.com> (sfid-20110622_154146_913504_76736765) <1308750416.29571.10.camel@jlt3.sipsolutions.net> Message-ID: <1308753669.17439.YahooMailRC@web161208.mail.bf1.yahoo.com> (sfid-20110622_164646_873767_DE57193A) Date: Wed, 22 Jun 2011 07:41:09 -0700 (PDT) From: Joerg Pommnitz Subject: Re: Performance regression between Madwifi/net80211 and ath5k/mac80211 To: Johannes Berg Cc: Adrian Chadd , linux-wireless@vger.kernel.org, ath5k-devel@lists.ath5k.org In-Reply-To: <1308750416.29571.10.camel@jlt3.sipsolutions.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Johannes, I'm glad that you take an interest. Here are my observations: To put some meat to my claims about the performance difference, I'm providing the summary lines from the TCP iperf server side: [ ID] Interval Transfer Bandwidth madwifi: [ 4] 0.0-10.5 sec 30.9 MBytes 24.7 Mbits/sec ath5k : [ 4] 0.0-10.8 sec 26.0 MBytes 20.2 Mbits/sec Note the significant difference in the bandwidth column. To answer your actual question: No, there doesn't seem to be a difference in CPU usage as shown by top. If anything, madwifi seems to use a little bit more: madwifi: 85,5% idle, 10% si ath5k : 89% idle, 10% si The CPU is: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Celeron(R) M processor 1.00GHz stepping : 8 cpu MHz : 999.954 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts bogomips : 1999.90 clflush size : 64 cache_alignment : 64 address sizes : 32 bits physical, 32 bits virtual power management: Anything else I can do? -- Thanks in advance and kind regards Joerg ----- Original Mail ---- > Von: Johannes Berg > An: Joerg Pommnitz > CC: Adrian Chadd ; linux-wireless@vger.kernel.org; >ath5k-devel@lists.ath5k.org > Gesendet: Mittwoch, den 22. Juni 2011, 15:46:56 Uhr > Betreff: Re: Performance regression between Madwifi/net80211 and ath5k/mac80211 > > Do you see different CPU usage? Does it max out? If so can you profile > it? > > johannes > >