From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-xd2f.google.com (mail-io1-xd2f.google.com [IPv6:2607:f8b0:4864:20::d2f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 49EAD3CB44 for ; Tue, 30 Nov 2021 23:50:58 -0500 (EST) Received: by mail-io1-xd2f.google.com with SMTP id c3so29172897iob.6 for ; Tue, 30 Nov 2021 20:50:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=wfpqi6rYv2Pg9WPpxMrTctQEFIGqON4PoIhCsVgQ/O4=; b=YYgX2SPyLMlQPq6W4r54nfwwbH4EojpaTgf/NyL+PVsIZ+1Lqnb/OCZlGyEG8AOSKJ XtBRSJo2htOPo66h3PrXWqpJCX21fj0KG0MmXlghPWGRPJ2oRzpAYhBZ8IA93t964LBV f5D+kLtcBQ7l7N7rNZawAYMzKm0WEMPJTnJIrVcyvu2IdpDGzmXcdoheFWRVUwBB4wBW ZjuF9vWj76GVN/UIVUDKSowhqKm9Ib+HL89YEWmzg10HAoBlPciGmh6UqqUauAQZA2HL lEUI59reQYrDVfTnOD3qO3kJjJlgrI9Et9/zpJl8bgKw7144/uj0pQK+mj8NTdpykmSH lh1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=wfpqi6rYv2Pg9WPpxMrTctQEFIGqON4PoIhCsVgQ/O4=; b=J0iRHJ98kImz5RoCBYo+qbsbq/FLr46sINbaRz2OUSU0l4hE9j/F3p0A8EiiMMJjtJ dK2c0UacIR9nu07YUpFRZ1IWc5FlZalN9WieY8PVOjc5WFeGU+ShtdROzlQziR1v8+eJ wv089IWn1X7NaQu1T7U3syXaePBkWT6vTTSO8kaTZ2bssIi7kYv+/CWIoLiIKZIDVZwT nHbf+fA8flvNbm9TBAk4sEUHcKZrCISn8AotqnpVmDctJ77lW1lSMtbWy5vMQQDdykQ8 Q56BV52Y4cDbxDOEBx6CCBNIyXPxZaD35RZjzlLClEU6nXMbdTweO8A7LOjegLcLEfVn WqIQ== X-Gm-Message-State: AOAM532p6sNVwvLcWY2LN0oiFAWQEioP4pUdw9WL4g9CjRe7U3NkumCh mf9fAvZ0Bll3zPJTnhmrsXI7uptNQ0lYu910M8078lRafgI= X-Google-Smtp-Source: ABdhPJxZzRIJI/bSuVIg8yMbBmDi2bKF+gv1+PNk8ULaD7z9H1BDVwWdEqvJSZ97hQ9vGhV4nhrW1KeChES8IBcSUbU= X-Received: by 2002:a05:6638:160c:: with SMTP id x12mr6570297jas.60.1638334257070; Tue, 30 Nov 2021 20:50:57 -0800 (PST) MIME-Version: 1.0 References: <1638312755.776218387@apps.rackspace.com> In-Reply-To: From: Dave Taht Date: Tue, 30 Nov 2021 20:50:44 -0800 Message-ID: To: "David P. Reed" Cc: cerowrt-devel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Cerowrt-devel] risc-v options? X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Dec 2021 04:50:58 -0000 and pspn looked interesting at 400Gbit: https://arxiv.org/pdf/2010.03536.pd= f On Tue, Nov 30, 2021 at 4:33 PM Dave Taht wrote: > > also, a 2.5ghz, 16 core chip was open sourced last month. > > https://www.cnx-software.com/2021/10/20/alibaba-open-source-risc-v-cores-= xuantie-e902-e906-c906-and-c910/ > > On Tue, Nov 30, 2021 at 4:23 PM Dave Taht wrote: > > > > On Tue, Nov 30, 2021 at 2:52 PM David P. Reed wro= te: > > > > > > For what? > > > > Because it's shiny. Because I don't care for the owner of softbank and > > arm very much. Because at least the core is open source, and I'd > > really like to try out some long held ideas about reducing context > > switch latency. And there's a couple instructions I'd like to add. > > > > >I have recently gotten a MicroSemi RISC-V SoC board with embedded FPGA= (or maybe it is better thought of as an FPGA board with multicore hard log= ic RISC-V host.) Runs Linux very fast. It's not set up to be a router, thou= gh - not unless I populate its PCIe slot with NICs. Standard Linux drivers= for PCIe devices all work quite well, so far. > > > > how fast can it context switch? (irtt bench) > > > > I am impressed that it works with anything on pcie. > > > > I was mostly dismissing risc-v as a toy that could never catch up to > > arm 3 years ago, but with the enormous chinese investment in it... > > > > > > > > > > > These early 64 bit RISC-V implementations are pretty darn good, but u= nlike Intel's Xeons, they don't yet handle memory channel performance very = well. > > > > Intel has always had an advantage in on-chip cache. > > > > > > > > > > > > > > (The 32-bit RISC-V's are really competing with ARM based microcontrol= lers for embedded systems. I don't find them interesting, though I have a c= ouple sample boards with 32 bit RISC-V cores). > > > > I don't find 32 bit risc-v interesting. I did fiddle with the 128 bit > > risc-v stuff for a while. > > > > > > > > > > > A random guess on my part: even consumer routers will be moving to 64= -bit processor designs in the next couple years. > > > > Many already have. > > > > > That's because the price difference is getting quite small, as a perc= entage of total product cost, and because it is hard to buy "small memory a= ddress space" DIMMs. I could be wrong, but extrapolation from today's trend= s suggests that is more likely than not. > > > > 802.11ax standards require - no joke - a 2MByte buffer per station. > > > > > > > > > > > > > > > > > > > > On Friday, November 26, 2021 3:02pm, "Dave Taht" said: > > > > > > > has anyone tried the latest generations of risc-v? > > > > > > > > https://linuxgizmos.com/17-sbc-runs-linux-on-allwinner-d1-risc-v-so= c/ > > > > > > > > -- > > > > I tried to build a better future, a few times: > > > > https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > > > > > > > > Dave T=C3=A4ht CEO, TekLibre, LLC > > > > _______________________________________________ > > > > Cerowrt-devel mailing list > > > > Cerowrt-devel@lists.bufferbloat.net > > > > https://lists.bufferbloat.net/listinfo/cerowrt-devel > > > > > > > > > > > > -- > > I tried to build a better future, a few times: > > https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > > > > Dave T=C3=A4ht CEO, TekLibre, LLC > > > > -- > I tried to build a better future, a few times: > https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > > Dave T=C3=A4ht CEO, TekLibre, LLC --=20 I tried to build a better future, a few times: https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org Dave T=C3=A4ht CEO, TekLibre, LLC