Date: Sat, 27 Jul 2013 18:22:18 +0200 From: Andre Oppermann <andre@freebsd.org> To: "Alexander V. Chernikov" <melifaro@FreeBSD.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it> Subject: Re: Recommendations for 10gbps NIC Message-ID: <51F3F3BA.20604@freebsd.org> In-Reply-To: <51F387E8.6090704@FreeBSD.org> References: <51F0386D.2000709@acm.poly.edu> <51F16A07.9030505@FreeBSD.org> <1374852658.90079.YahooMailNeo@web121601.mail.ne1.yahoo.com> <51F2A313.9070105@FreeBSD.org> <alpine.LRH.2.03.1307261646050.25254@nber.org> <1374876857.42890.YahooMailNeo@web121603.mail.ne1.yahoo.com> <51F37E97.3090203@FreeBSD.org> <CA%2BhQ2%2BgQxdNM1o_rScuyPb_T9sm%2B=gEF1dUa5aknfUYrO4K9HA@mail.gmail.com> <51F387E8.6090704@FreeBSD.org>
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On 27.07.2013 10:42, Alexander V. Chernikov wrote: > On 27.07.2013 12:15, Luigi Rizzo wrote: >> On Sat, Jul 27, 2013 at 10:02 AM, Alexander V. Chernikov >> <melifaro@freebsd.org> wrote: >> This makes me curious because i believe people have used netmap with >> the 82598 and achieved close to line rate even with 64-byte frames/one port, >> and i thought (maybe I am wrong ?) the various 2-port NICs use 4 lanes per port. >> So the number i remember does not match with your quote of 2.5Gt/s. >> Are all 82598 using 2.5GT/s (which is a gen.1 speed) instead of 5 ? > > Quoting 82598EB datasheet: > The PCIe v2.0 (2.5 GT/s) interface is used by the 82598EB as a host interface. It supports x8, x4, > x2 and x1 configurations at a speed of 2.5 GHz. The maximum aggregated raw ban.. > > Actually I discovered this exactly with netmap and 82598*-DA2 NIC :) Discussing the 82598 is moot because it has been replaced with the 82599 which supports x1-x8 at 5 GT/s. AFAIK you can't event buy the 82598 anymore. -- Andre
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