Date: Sun, 23 Sep 2012 19:35:09 +0400 From: Andrey Zonov <zont@FreeBSD.org> To: "Eggert, Lars" <lars@netapp.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: [patch] sysctls for TCP timers Message-ID: <505F2C2D.5050904@FreeBSD.org> In-Reply-To: <D4D47BCFFE5A004F95D707546AC0D7E906888619@SACEXCMBX01-PRD.hq.netapp.com> References: <505AC500.6060903@FreeBSD.org> <D4D47BCFFE5A004F95D707546AC0D7E906888619@SACEXCMBX01-PRD.hq.netapp.com>
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[-- Attachment #1 --] On 9/20/12 11:35 AM, Eggert, Lars wrote: > Hi, > > On Sep 20, 2012, at 9:25, Andrey Zonov <zont@freebsd.org> wrote: >> Some of them may be read google's article about tuning TCP parameters >> [1]. I convert most of TCP timers to sysctls [2] and we are using this >> patch for few months. We tuned net.inet.tcp.rtobase and >> net.inet.tcp.syncache.rexmttime and it gives good results (especially in >> conjunction with cc_htcp(4)). > > can you share some measurements that quantify the results? > When we set net.inet.tcp.syncache.rexmttime=200 and net.inet.tcp.syncache.rexmtlimit=7 for our external web service, the number of duplicated SYN was reduced in four times. -- Andrey Zonov [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.18 (Darwin) Comment: GPGTools - http://gpgtools.org iQEcBAEBAgAGBQJQXywwAAoJEBWLemxX/CvTuoQH/1b0a2TTuiQ+t/c65FBBcRG1 oQvAEf9T+aT1yxB603+itGu9iS+Rf775E4TwpkNEBOOfPY2qjzsH/L2UB+by2HL8 JwvVizXMfZgqmHR7U0HoXWN8isiYng1aA7SVSCVZdZz7ZeLXehNdGA0BGHj8ZO3M XUiI6Pq9wnH1wSIYBSPHsFCOqBX06390/yxJUS55Twq4pICamaVu8xDcrOLSl9hu kQw4bErBHyDm0x96H/GLPy5Fh5YMUlFSuLi/eZRCb8ytqeWFLEyLvRFT4lGWhhi8 k5qq9tTTGaobHQOtOpd+pVYLu3ZlR1Y/zQW9/KAvbpsHFlIQaiIztw36X2srV+M= =4g0B -----END PGP SIGNATURE-----
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