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Wed, 4 May 2016 09:57:56 +0000 To: From: Kevin Darbyshire-Bryant Message-ID: <5729C7A0.40600@darbyshire-bryant.me.uk> Date: Wed, 4 May 2016 10:57:52 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms090508000206070804030802" X-Originating-IP: [109.159.227.69] X-ClientProxiedBy: HE1PR08CA0023.eurprd08.prod.outlook.com (10.161.112.33) To DB5PR07MB0934.eurprd07.prod.outlook.com (10.161.200.141) X-MS-Office365-Filtering-Correlation-Id: 76166a1f-9130-4010-0d7b-08d374029199 X-Microsoft-Exchange-Diagnostics: 1; DB5PR07MB0934; 2:IBv5rv5jy0ZKL5RioWsBO8nj9uup/MMSNHMwj7eUg3QVc1gEMhBTb0mDBdEO3Ph4lxm4QcuwqvX2gTYIctwLHFNlLoa7TKV2CN+XNRs79LXP4SMEaJgKaYnR3DU8tAGUCZuopZwfiaFxVD1NKtCAPz3oYKDyihp824gLVbd2y68qUN5c7X665gAcmvqmL24e; 3:AidRbE9oJ1NZc+BiIo8UpTfVKJ31XsHoTFtQcC7Xn0URSdrH+1qoULsN7D9GgJuiseyLT6FmZ74p30DMaZ8MW1pA4d1IT+yX16EuRbqSi7U2jQD4VeY+vp7UjZefTCOK X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:DB5PR07MB0934; 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Confused X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 May 2016 09:57:59 -0000 --------------ms090508000206070804030802 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi All, As a result of Eric's recent change to fq_codel which, to use an analogy, when being subject to loads of sh*t, it's better to use a shovel to get rid of it rather than a teaspoon, I started having a nose deeper into cake than I've ever gone before. I was also interested to note that one of Dave's recent tests where cake was using lots of CPU but apparently cake wasn't getting into its own 'buffer full, discard at enqueue' mode. That sort of suggests the dequeue process was the thing using all the CPU, possibly starving the process generating packets so the buffer never filled. So, in the context of I'm an ignorant buffoon, I'm wondering what I'm misunderstanding from the following extract of code: codel5.h, line 358 if (!skb) { vars->dropping =3D false; return skb; } drop =3D codel_should_drop(skb, sch, vars, p, now, overloaded); if (vars->dropping) { if (!drop) { /* sojourn time below target - leave dropping state */ vars->dropping =3D false; } else if (now >=3D vars->drop_next) { /* It's time for the next drop. Drop the current * packet and dequeue the next. The dequeue might= * take us out of dropping state. * If not, schedule the next drop. * A large backlog might result in drop rates so high * that the next drop should happen now, * hence the while loop. */ /* saturating increment */ vars->count++; if (!vars->count) vars->count--; codel_Newton_step(vars); vars->drop_next =3D codel_control_law(vars->drop_= next, p->interval, =20 vars->rec_inv_sqrt); do { if (INET_ECN_set_ce(skb)) { vars->ecn_mark++; /* and schedule the next drop */ vars->drop_next =3D codel_control= _law( vars->drop_next, p->interval, vars->rec_inv_sqrt); goto end; } qdisc_drop(skb, sch); vars->drop_count++; skb =3D custom_dequeue(vars, sch); if (skb && !codel_should_drop(skb, sch, vars, p, now, overloaded)) { /* leave dropping state */ vars->dropping =3D false; } else { /* schedule the next drop */ vars->drop_next =3D codel_control= _law( vars->drop_next, p->interval, vars->rec_inv_sqrt); } } while (skb && vars->dropping && now >=3D vars->drop_next); /* Mark the packet regardless */ if (skb && INET_ECN_set_ce(skb)) vars->ecn_mark++; } In essence my (mis)understanding of this code is something like: We've got here because we've been dropping and codel is telling is to continue to drop. With that decided we enter a do..while, the first thing to happen is to ECN mark and let that marked packet escape to send the signal. Otherwise we appear to iterate around the loop. So here's the nub of my question: the INET_ECN_set_ce is done on every iteration of that loop...with its potential early escape..do we escape on every iteration? Do we need to twiddle the ECN bits on every packet that we're about to drop? And we seem to mark the packet on exit of the loop anyway. I'm confused but almost certainly because I'm an idiot. 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