From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baruch Even Subject: Re: netif_rx packet dumping Date: Thu, 03 Mar 2005 22:31:28 +0000 Message-ID: <42279040.5050003@ev-en.org> References: <20050303123811.4d934249@dxpl.pdx.osdl.net> <42278122.6000000@ev-en.org> <1109887386.1092.333.camel@jzny.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Stephen Hemminger , Injong Rhee , John Heffner , "David S. Miller" , Yee-Ting Li , netdev@oss.sgi.com To: hadi@cyberus.ca In-Reply-To: <1109887386.1092.333.camel@jzny.localdomain> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org jamal wrote: > On Thu, 2005-03-03 at 16:26, Baruch Even wrote: > > >>NAPI was not used because it caused skews in the performance, I haven't >>tested it myself, just passing hearsay. > > It will help to post on this list when such issues are noticed. > It could be a simple a driver bug: such a the one posted on by Lennert 2 > days ago on e1000 NAPI - such a bug could have had serious repurcasions > on TCP because it sat on packets in DMA occasionally upto 2 seconds. > Seems like that bug has been sitting there for a long time. > What kernel version? What kind of skews? > Is it possible you tell this person to repeat the tests with 2.6.11? I have asked around but there is no hard data to substantiate the claim at this time. And since then all tests were done non-NAPI style. Kernel versions were probably 2.4.23 or some other 2.4 kernel. Baruch