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[119.18.15.55]) by smtp.gmail.com with ESMTPSA id p2sm26562806pfi.95.2019.02.21.00.32.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Feb 2019 00:32:44 -0800 (PST) Sender: Kubilay Kocak Reply-To: koobs@FreeBSD.org Subject: Re: svn commit: r344368 - head/sys/netinet To: Michael Tuexen , src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org References: <201902201803.x1KI3haW078567@repo.freebsd.org> From: Kubilay Kocak Message-ID: <7b4f29d5-e909-6397-7c24-b5979a3963c1@FreeBSD.org> Date: Thu, 21 Feb 2019 19:32:41 +1100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Thunderbird/66.0 MIME-Version: 1.0 In-Reply-To: <201902201803.x1KI3haW078567@repo.freebsd.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6B5679623C X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.93 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.93)[-0.927,0]; REPLY(-4.00)[]; TAGGED_FROM(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Feb 2019 08:32:47 -0000 On 21/02/2019 5:03 am, Michael Tuexen wrote: > Author: tuexen > Date: Wed Feb 20 18:03:43 2019 > New Revision: 344368 > URL: https://svnweb.freebsd.org/changeset/base/344368 > > Log: > Reduce the TCP initial retransmission timeout from 3 seconds to > 1 second as allowed by RFC 6298. > > Reviewed by: kbowling@, Richard Scheffenegger > Sponsored by: Netflix, Inc. > Differential Revision: https://reviews.freebsd.org/D18941 > > Modified: > head/sys/netinet/tcp_syncache.c > head/sys/netinet/tcp_timer.h > > Modified: head/sys/netinet/tcp_syncache.c > ============================================================================== > --- head/sys/netinet/tcp_syncache.c Wed Feb 20 17:56:38 2019 (r344367) > +++ head/sys/netinet/tcp_syncache.c Wed Feb 20 18:03:43 2019 (r344368) > @@ -159,7 +159,7 @@ static int syncookie_cmp(struct in_conninfo *inc, str > * tcp_backoff[1] + > * tcp_backoff[2] + > * tcp_backoff[3]) + 3 * tcp_rexmit_slop, > - * 3000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 45600 ms, > + * 1000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 15600 ms, > * the odds are that the user has given up attempting to connect by then. > */ > #define SYNCACHE_MAXREXMTS 3 > > Modified: head/sys/netinet/tcp_timer.h > ============================================================================== > --- head/sys/netinet/tcp_timer.h Wed Feb 20 17:56:38 2019 (r344367) > +++ head/sys/netinet/tcp_timer.h Wed Feb 20 18:03:43 2019 (r344368) > @@ -77,7 +77,7 @@ > #define TCPTV_MSL ( 30*hz) /* max seg lifetime (hah!) */ > #define TCPTV_SRTTBASE 0 /* base roundtrip time; > if 0, no idea yet */ > -#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */ > +#define TCPTV_RTOBASE ( 1*hz) /* assumed RTO if no info */ > > #define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */ > #define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */ > _______________________________________________ Any way this can be a run-time tunable?