Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757258Ab1EaPn1 (ORCPT ); Tue, 31 May 2011 11:43:27 -0400 Received: from alternativer.internetendpunkt.de ([88.198.24.89]:34105 "EHLO geheimer.internetendpunkt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753302Ab1EaPn0 (ORCPT ); Tue, 31 May 2011 11:43:26 -0400 To: tsuna Subject: Re: [PATCH] tcp: Expose the initial RTO via a new sysctl. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Date: Tue, 31 May 2011 17:43:25 +0200 From: Hagen Paul Pfeifer Cc: "H.K. Jerry Chu" , David Miller , , , , , , , In-Reply-To: References: <1305715384-81716-1-git-send-email-tsunanet@gmail.com> <20110518.152653.1486764697527722925.davem@davemloft.net> <20110518.155200.801089483916944725.davem@davemloft.net> <20110518202025.GC4175@nuttenaction> Message-ID: <0328b2351e8e11a19301262842ef0491@localhost> User-Agent: RoundCube Webmail/0.1-rc1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1138 Lines: 29 On Tue, 31 May 2011 08:28:18 -0700, tsuna wrote: > Sorry I meant a knob such as /proc/sys/net/ipv4/tcp_initrto. That's the same! ;-) >> The initRTO is the ideal candidate for a >> per route knob. And happily you will solve 2) with the per route thing >> too! > > You still need a knob for the default system-wide value, don't you? Yes, try to re-read the emails. Sysctl is a no-go, with a per route interface you have the ability to tune the values. Talk with Jerry once again - he wrote that at Google they already have a patch for this. And with a per route knob you can select a even smaller value for your local network (e.g. datacenter) and a larger value for all other routes. It makes sense to provide a knob for this on a route basis, not on a global sysctl basis. But once again: talk with Jerry - he has the expert knowledge! Hagen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/