From mboxrd@z Thu Jan 1 00:00:00 1970 From: richard -rw- weinberger Subject: Re: updates to syncookies - timestamps not needed any more (freebsd) Date: Fri, 12 Jul 2013 08:59:06 +0200 Message-ID: References: <20130708160421.GA9763@order.stressinduktion.org> <20130711.165726.2168148122875413191.davem@davemloft.net> <20130712014138.GD12611@order.stressinduktion.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: David Miller , "netdev@vger.kernel.org" Return-path: Received: from mail-vc0-f175.google.com ([209.85.220.175]:44173 "EHLO mail-vc0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756788Ab3GLG7H (ORCPT ); Fri, 12 Jul 2013 02:59:07 -0400 Received: by mail-vc0-f175.google.com with SMTP id hr11so7338346vcb.20 for ; Thu, 11 Jul 2013 23:59:07 -0700 (PDT) In-Reply-To: <20130712014138.GD12611@order.stressinduktion.org> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, Jul 12, 2013 at 3:41 AM, Hannes Frederic Sowa wrote: > On Thu, Jul 11, 2013 at 04:57:26PM -0700, David Miller wrote: >> From: Hannes Frederic Sowa >> Date: Mon, 8 Jul 2013 18:04:21 +0200 >> >> > Interesting patch by Andre Opperann of FreeBSD: >> > >> >> Interesting work, but outside of the change of hash function I'm not so >> sure. The whole reason we went to the timestamp field was to eliminate >> the coarse tables. >> >> I understand that he claims that %99.99 of connections are handled by >> the values he has chosen, but this is still a step backwards in my >> opinion. > > If I understood this thread[0] correctly, it seems Windows 8 might not > enable TCP timestamps by default? I can not verify, I currently have > no Windows installations near me. That would mean, linux does, too, > fall back to an unscaled window connection as soon as syncookies kick in > (but we would not end up with an unsynchronized window scale option). My Windows 8 workstations here have it disabled by default. -- Thanks, //richard