Date: Mon, 3 Mar 2014 17:11:20 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: delayed_ack and Nagle's algorithm interaction Message-ID: <CAJ-Vmo=oygSkJ3XSBo1yKvLDWzmhjMEC37DZbUHTOCbbTSH1eg@mail.gmail.com> In-Reply-To: <531499E2.2080109@FreeBSD.org> References: <531499E2.2080109@FreeBSD.org>
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What's the time interval between transmissions? Is it something dumb like bad timer behaviour? -a On 3 March 2014 07:04, Andriy Gapon <avg@freebsd.org> wrote: > > Guys, > > my knowledge of TCP and our TCP/IP stack is quite basic. > It seems that we are running into a problem described here or something with > very similar symptoms: > http://www.stuartcheshire.org/papers/NagleDelayedAck/ > At least, if I either disable delayed_ack or use TCP_NODELAY option, then the > problem goes away. Otherwise, we see quite significant extra latencies. > Maybe an important detail: the problem is observed for communication between a > local host client and a server in a jail. So, all traffic is local (via > loopback interface). > > I have a pcap file that captures the problem. > Ideas, suggestion, etc are welcome. > Thanks! > -- > Andriy Gapon > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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