From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Frank Ch. Eigler" Subject: Re: [PATCH v2 0/2] Tracepoint for tcp retransmission Date: Sun, 5 Feb 2012 07:53:25 -0500 Message-ID: <20120205125325.GA31578@elastic.org> References: <65795E11DBF1E645A09CEC7EAEE94B9CB728DD67@USINDEVS02.corp.hds.com> <20120120.135028.1359677274445012541.davem@davemloft.net> <65795E11DBF1E645A09CEC7EAEE94B9CB8D3EA7B@USINDEVS02.corp.hds.com> <20120204142823.GA7000@neilslaptop.think-freely.org> <20120204155807.GA2657@nuttenaction> <20120204200937.GA2670@neilslaptop.think-freely.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Hagen Paul Pfeifer , Satoru Moriya , David Miller , "netdev@vger.kernel.org" , "tgraf@infradead.org" , "stephen.hemminger@vyatta.com" , "eric.dumazet@gmail.com" , Seiji Aguchi , fche@sourceware.org To: Neil Horman Return-path: Received: from elastic.org ([69.20.226.105]:59657 "EHLO elastic.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751758Ab2BENIt (ORCPT ); Sun, 5 Feb 2012 08:08:49 -0500 Content-Disposition: inline In-Reply-To: <20120204200937.GA2670@neilslaptop.think-freely.org> Sender: netdev-owner@vger.kernel.org List-ID: Hi - On Sat, Feb 04, 2012 at 03:09:37PM -0500, Neil Horman wrote: > [...] > Systemtap is fine for development. Lots of application/product > vendors really don't like it. On top of the difficult to use > aspect (Just curious, what difficulty-to-use aspect have you more recently come across?) > it requires that debugging stabs info be kept with the kernel, which > is a real pain, especially if you're running on a stable kernel. > [...] You probably mean when running on an unstable kernel, no? Installing debuginfo for a stable kernel is a one-time event. It also enables "perf probe" and crash(8) and other tools. Plus, with systemtap, there are two separate network-remoting mechanisms (--use-server compilation and --remote execution) that make local debuginfo unnecessary. Anyway, a reasonable way to go may be to prototype in stap whatever hard-coded kernel module y'all envision finally doing this work. - FChE