From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x242.google.com (mail-lf0-x242.google.com [IPv6:2a00:1450:4010:c07::242]) (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 74E233B2B0 for ; Sun, 12 Jun 2016 13:51:47 -0400 (EDT) Received: by mail-lf0-x242.google.com with SMTP id j191so199789lfb.3 for ; Sun, 12 Jun 2016 10:51:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=nM5mFanpR3dNAe38H9pTQCOFUlxCBruD1r9XcjMJOPM=; b=Zb8/4VvjtkHaEGFNO0cPk1qVbV3v1WFOUroZrC5h+M5QSdxFZmrqgqUcFjzU4vDZP4 pPb8VVL+iosQ0FLe+NrQkCLcBzsPKZao1vceHLA5HsG4/z+HvWFSRlVf1Xipz0viLTr0 xFSLYPXGlChQ4O40THMtOUqgnbDeFLttkK6qezS1+iFMO6eMt1jjQ57QaF1BzayZhNRA aYvbUXNxiLdX43qs1vt7oWY0InxS1hjvaiYIVMR0vKrzjqh6cFK8NLrQKjpnXHkIlZaT EUTJN8MulQlINH6d76hpHrZRGGF5KzBHTZZWldOdrrvZeVCIMfpslOmWmA5LM90mxVU3 2Gsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=nM5mFanpR3dNAe38H9pTQCOFUlxCBruD1r9XcjMJOPM=; b=TntdOdSXTqIlRt1Eq4e/hP6cK7czwjBj7KwRuFoX/yErRgEhQYbx1z43GcBvWIruT4 hQH7OlYTnLY0iqBqjJ2FWAXTMmRVOknWk+XyK1yjHseaNPOV64pG3N3sUY2jY26GkXif n5LUcO6WK0TxGFCRULKKLJgZ2VvTs5fWuN5/ZQkpnZONmJmHcu5IZfG3xMGLCAjOW9Pk MJTdt5xElpgk/Hj72FrJOpEwsYEG2p0VXG/87AReue84X9igtcNz7MsCaEEMpbRXTmEd 2vIidx+VIJJuVBZ5U6xkvjMcpUUT09XeOTuJI2F7KXjhu7M3SMCqTGx37KRE2P0EIGf/ 4YHw== X-Gm-Message-State: ALyK8tID4VHEi9YfDELZ6OiGqfYXx6jw52nSbJIR5dxzOnntTe3nloQ5b1lq6JGzYv8Cug== X-Received: by 10.25.127.4 with SMTP id a4mr3172804lfd.111.1465753906209; Sun, 12 Jun 2016 10:51:46 -0700 (PDT) Received: from bass.home.chromatix.fi (176-93-9-44.bb.dnainternet.fi. [176.93.9.44]) by smtp.gmail.com with ESMTPSA id g10sm2429891lbf.26.2016.06.12.10.51.29 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 12 Jun 2016 10:51:45 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: <1465753733.7945.85.camel@edumazet-glaptop3.roam.corp.google.com> Date: Sun, 12 Jun 2016 20:51:13 +0300 Cc: Dave Taht , cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: References: <5756ADEC.9070305@darbyshire-bryant.me.uk> <8EE35B4F-5C28-41C7-8795-93A6F606B3A8@gmail.com> <5756E2CA.2020700@darbyshire-bryant.me.uk> <575BD5D0.4060702@darbyshire-bryant.me.uk> <98AFD8C3-2343-4B8B-BFB0-6F877161A039@gmail.com> <1465749085.7945.81.camel@edumazet-glaptop3.roam.corp.google.com> <1465753733.7945.85.camel@edumazet-glaptop3.roam.corp.google.com> To: Eric Dumazet X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] Possible BUG - parent backlog incorrectly updated in case of NET_XMIT_CN 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: Sun, 12 Jun 2016 17:51:47 -0000 > On 12 Jun, 2016, at 20:48, Eric Dumazet = wrote: >=20 >> A) In my failing to make sense of all the dialog around these patches >> ( https://lwn.net/Articles/687617/ ), it sounds like this (inbound >> and outbound) processing are still locked to a single thread, >> essentially? >=20 > Om a router, these discussions should not matter really, since the > workload is about receiving/sending packets without user space > intervention (well... I do hope this !) Dave=E2=80=99s point is that inbound and outbound processing could in = principle be on *two* distinct threads, potentially doubling aggregate = throughput in a CPU-limited environment. - Jonathan Morton