Date: Tue, 20 Nov 2012 14:49:41 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Jim Thompson <jim@netgate.com> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD boxes as a 'router'... Message-ID: <1353451781.17468.YahooMailClassic@web121605.mail.ne1.yahoo.com> In-Reply-To: <E1F4816E-676C-4630-9FA1-817F737D007D@netgate.com>
next in thread | previous in thread | raw e-mail | index | archive | help
It's not an "opinion"; it obvious to anyone who had a mild understand of wh= at pollingis. You've never compared it to moderation, which is what you sho= uld be using, becauseyou don't understand what you're doing. If you set interrupt moderation to 2000 ints/sec, you're doing exactly the = same thingas polling without the overheard. You're comparing polling to random tuning. Which is why I say that anyone w= ho=A0recommends polling doesn't really understand what they're doing. --- On Tue, 11/20/12, Jim Thompson <jim@netgate.com> wrote: From: Jim Thompson <jim@netgate.com> Subject: Re: FreeBSD boxes as a 'router'... To: "Barney Cordoba" <barney_cordoba@yahoo.com> Cc: khatfield@socllc.net, freebsd-net@freebsd.org Date: Tuesday, November 20, 2012, 5:42 PM On Nov 20, 2012, at 3:52 PM, Barney Cordoba <barney_cordoba@yahoo.com> wrot= e: Anyone who even mentions polling should be discounted altogether. Polling had value when you couldn't control the interrupt delays; but interrupt moderation allows you to pace the interrupts any way you like without the inefficiencies of polling. You're entitled to your opinion, but experimental results have tended to sh= ow yours incorrect. Jim From owner-freebsd-net@FreeBSD.ORG Tue Nov 20 23:11:33 2012 Return-Path: <owner-freebsd-net@FreeBSD.ORG> Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id BE90F630 for <freebsd-net@freebsd.org>; Tue, 20 Nov 2012 23:11:33 +0000 (UTC) (envelope-from if@xip.at) Received: from chile.gbit.at (ns1.xip.at [193.239.188.99]) by mx1.freebsd.org (Postfix) with ESMTP id 0735D8FC12 for <freebsd-net@freebsd.org>; Tue, 20 Nov 2012 23:11:31 +0000 (UTC) Received: (qmail 23628 invoked from network); 21 Nov 2012 00:04:47 +0100 Received: from fw.xip.at (HELO ?127.0.0.1?) (89.207.145.147) by chile.gbit.at with SMTP; 21 Nov 2012 00:04:47 +0100 Message-ID: <50AC0C92.8080603@xip.at> Date: Wed, 21 Nov 2012 00:04:50 +0100 From: Ingo Flaschberger <if@xip.at> User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20121026 Thunderbird/16.0.2 MIME-Version: 1.0 To: freebsd-net@freebsd.org Subject: Re: FreeBSD boxes as a 'router'... References: <1353448328.76219.YahooMailClassic@web121602.mail.ne1.yahoo.com> <E1F4816E-676C-4630-9FA1-817F737D007D@netgate.com> <50AC08EC.8070107@mu.org> In-Reply-To: <50AC08EC.8070107@mu.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>; List-Post: <mailto:freebsd-net@freebsd.org> List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=subscribe> X-List-Received-Date: Tue, 20 Nov 2012 23:11:33 -0000 Am 20.11.2012 23:49, schrieb Alfred Perlstein: > On 11/20/12 2:42 PM, Jim Thompson wrote: >> On Nov 20, 2012, at 3:52 PM, Barney Cordoba >> <barney_cordoba@yahoo.com> wrote: >> >> You're entitled to your opinion, but experimental results have tended >> to show yours incorrect. >> >> Jim > Agree with Jim. If you want pure packet performance you burn a core > to run a polling loop. At new systems, without polling I had better performance and no live-locks, at old systems (Intel 82541GI) polling prevent live-locks. Best test: Loop a GigE Switch, inject a Packet and plug it into the test-box. Kind regards, Ingo Flaschberger
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1353451781.17468.YahooMailClassic>