Date: Mon, 27 Sep 2010 15:17:59 +0200 From: Andre Oppermann <andre@freebsd.org> To: Maxim Dounin <mdounin@mdounin.ru> Cc: freebsd-net@freebsd.org, Igor Sysoev <is@rambler-co.ru>, Lawrence Stewart <lstewart@freebsd.org> Subject: Re: net.inet.tcp.slowstart_flightsize in 8-STABLE Message-ID: <4CA09987.8020205@freebsd.org> In-Reply-To: <20100927081217.GM44164@mdounin.ru> References: <20100512124702.GJ2679@rambler-co.ru> <20100713140051.GV99657@mdounin.ru> <4C5BCE48.5070504@freebsd.org> <20100913172453.GG99657@mdounin.ru> <20100927081217.GM44164@mdounin.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
On 27.09.2010 10:12, Maxim Dounin wrote: > Hello! > > On Mon, Sep 13, 2010 at 09:24:53PM +0400, Maxim Dounin wrote: > > [...] > >> Andre, could you please take a look at one more patch as well? >> >> Igor reported that it still sees 100ms delays with rfc3465 turned >> on, and it turns out to be similar issue (setting cwnd to 1*MSS) >> for hosts found in hostcache. >> >> The problem with setting cwnd from hostcache was already reported >> here: >> >> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/92690 >> http://lists.freebsd.org/pipermail/freebsd-net/2007-July/014780.html >> >> As using larger cwnd from hostcache may cause problems on >> congested links (see second thread) I changed code to only use >> cached cwnd as an upper bound for cwnd (instead of fixing current >> code). This is also in-line with what we do on connection >> restarts. >> >> We may later consider re-adding usage of larger cwnd from >> hostcache. But I believe it should be done carefully and >> probably behind sysctl, off by default. > > Ping. Thanks for the reminder. I'll disable priming CWND from hostcache. -- Andre
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4CA09987.8020205>