From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Schmid Subject: Re: TCP-Protection is really a pain... Date: Thu, 03 Feb 2005 23:29:10 +0100 Message-ID: <4202A5B6.5080903@rapidforum.com> References: <4201A382.1020208@rapidforum.com> <20050202205437.571a702b@localhost.localdomain> <4201B4EA.2030101@rapidforum.com> <20050203113335.46396c11@dxpl.pdx.osdl.net> <42028278.7040008@rapidforum.com> <20050203121503.4f122779@dxpl.pdx.osdl.net> <42028747.6060602@rapidforum.com> <4202A206.7060100@pobox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Stephen Hemminger , netdev@oss.sgi.com To: Jeff Garzik In-Reply-To: <4202A206.7060100@pobox.com> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org I turned it off and without it, I was unable to reproduce any stalls anymore. Jeff Garzik wrote: > Christian Schmid wrote: > >> What exactly is tcp segmentation offload? Where can I read more about >> it? Should I disable it or is this not a good idea? > > > It's an optimization designed to reduce CPU usage for zero-copy apps > (those that use sendfile(2)). > > It would be a useful datapoint to disable TSO, and see if that improves > things for you. > > Jeff > > > >