From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fan Du Subject: Re: [PATCH net-next 1/3] ipv4: Raise tcp PMTU probe mss base size Date: Mon, 16 Feb 2015 13:15:54 +0800 Message-ID: <54E17D0A.5050604@gmail.com> References: <1423815405-32644-1-git-send-email-fan.du@intel.com> <1423815405-32644-2-git-send-email-fan.du@intel.com> <54DDC8B1.1050307@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Fan Du , davem@davemloft.net, netdev@vger.kernel.org To: yzhu1 Return-path: Received: from mail-pa0-f53.google.com ([209.85.220.53]:56178 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751018AbbBPFUb (ORCPT ); Mon, 16 Feb 2015 00:20:31 -0500 Received: by mail-pa0-f53.google.com with SMTP id lf10so32623756pab.12 for ; Sun, 15 Feb 2015 21:20:30 -0800 (PST) In-Reply-To: <54DDC8B1.1050307@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: =E4=BA=8E 2015=E5=B9=B402=E6=9C=8813=E6=97=A5 17:49, yzhu1 =E5=86=99=E9= =81=93: > backward compatible? :-D yes, it will be auto tuned back in black hole detecting path. Also user could adjust the base size through /proc/sys/net/ipv4/tcp_bas= e_mss for optimal configuration. > Zhu Yanjun > On 02/13/2015 04:16 PM, Fan Du wrote: >> Quotes from RFC4821 7.2. Selecting Initial Values >> >> It is RECOMMENDED that search_low be initially set to an MTU siz= e >> that is likely to work over a very wide range of environments. = Given >> today's technologies, a value of 1024 bytes is probably safe eno= ugh. >> The initial value for search_low SHOULD be configurable. >> >> Moreover, set a small value will introduce extra time for the search >> to converge. So set the initial probe base mss size to 1024 Bytes. >> >> Signed-off-by: Fan Du >> ---