From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ww0-f47.google.com (mail-ww0-f47.google.com [74.125.82.47]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id A1028201A5A for ; Sun, 29 May 2011 11:58:47 -0700 (PDT) Received: by wwk4 with SMTP id 4so3058229wwk.28 for ; Sun, 29 May 2011 12:14:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:subject:from:to:cc:in-reply-to:references :content-type:date:message-id:mime-version:x-mailer :content-transfer-encoding; bh=3QXdUS7UeZk7ywnam2f+GDM/8u0j1ZC4gAxkvpTbCJM=; b=kAJJ0uNVILqC0b1fUduZUXT0JmXn7ivavwoNWJF3785Jd/P6A3luiIcDR0u1fIQy9p 1vb55jNRDC//lMwSkQORvKOvWBzRKmIsI7Br0NvpJ/+UANwV3hFbn8yneOZ94pUqezD5 6SeXVUceVddsOhU7gjoGJ7z9NFYgBBz2cG1+o= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=LTh0eGt+bnDdYG5tz8MgvU9QSuf88dPJqqJyJ2THa7Ur4lmD1zrcaaHSWMvPqouyxb 9fm0XIrORbUwXf78DNjcwPnuy26wtt/Ehs9IxJeJcUDP9FW8s/ps/lowQSew6yEouPlw 3ULpDd5lGH5e3BZhdRDr8/42PuOUSDwf2Rr/Y= Received: by 10.227.12.15 with SMTP id v15mr1515835wbv.77.1306696478656; Sun, 29 May 2011 12:14:38 -0700 (PDT) Received: from [192.168.1.21] (83.144.72.86.rev.sfr.net [86.72.144.83]) by mx.google.com with ESMTPS id fw15sm2568730wbb.44.2011.05.29.12.14.37 (version=SSLv3 cipher=OTHER); Sun, 29 May 2011 12:14:38 -0700 (PDT) From: Eric Dumazet To: Dave Taht In-Reply-To: References: <7ifwnxbjyn.fsf@lanthane.pps.jussieu.fr> <7i62otpks1.fsf@lanthane.pps.jussieu.fr> <1306686801.30021.14.camel@edumazet-laptop> <1306689449.30021.16.camel@edumazet-laptop> Content-Type: text/plain; charset="UTF-8" Date: Sun, 29 May 2011 21:14:36 +0200 Message-ID: <1306696476.30021.21.camel@edumazet-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 8bit Cc: Gabor Juhos , bloat Subject: Re: [Bloat] tiny monsters: multicast packets X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 May 2011 18:58:48 -0000 Le dimanche 29 mai 2011 à 11:40 -0600, Dave Taht a écrit : > > > perf-top does not appear to have been ported to openwrt, and as cool > as it is, I do not know if the related performance counters exist for > mips. > > it would be darn useful though. > > All I know at the moment is that sirq is at 99% at the given > workload, > according busybox's top. > > http://www.bufferbloat.net/attachments/download/33/routertest.png > > It is mildly early to point at the driver as being the issue - it > could be the switch or something else entirely. Would iptables or qos > rules show up in sirq? > Yes, about all this stuff is run in softirq. QOS can be a problem if high resolution kernel time services are expensive on this platform. You could try a raw routing stuff, with no QOS / iptables, just to see how much packets can be received/sent by this unit. And if it stills sucks, just do an input test only, dropping packets immediately with "iptables -I INPUT -i name -j DROP" (to check how many packets/second can be received by the driver)