Date: Thu, 11 Oct 2001 18:30:37 -0700 (PDT) From: Luigi Rizzo <rizzo@aciri.org> To: archie@dellroad.org (Archie Cobbs) Cc: mike@sentex.net, rizzo@aciri.org, freebsd-net@FreeBSD.ORG Subject: Re: strange results with increased net.inet.ip.intr_queue_maxlen Message-ID: <200110120130.f9C1Ubw15419@iguana.aciri.org> In-Reply-To: <200110120116.f9C1GEv18196@arch20m.dellroad.org> from Archie Cobbs at "Oct 11, 2001 6:16:14 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
> > from pinging the other side of the OC-3 or ethernet connection and > > measuring the response time, how can I see how much latency is added by > > increasing these buffers ? of course the latency increase depends on how full are the buffers, and the worst case is easier to determine by back-of-the-envelope calculations: queue_slots * max_pkt_size / bottleneck_link_speed e.g. if you have 100 slots and an MSS of 1500 and a 10Mbit bottleneck you are adding (100*1500*8 / 10000000) = 120ms latency. cheers luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200110120130.f9C1Ubw15419>