From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-x243.google.com (mail-pf0-x243.google.com [IPv6:2607:f8b0:400e:c00::243]) (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 33D7C3B25E for ; Fri, 21 Oct 2016 06:55:14 -0400 (EDT) Received: by mail-pf0-x243.google.com with SMTP id s8so8351258pfj.2 for ; Fri, 21 Oct 2016 03:55:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:subject:from:to:cc:date:in-reply-to:references :mime-version:content-transfer-encoding; bh=Mvoa0dDnSsibjBSqghSkF2xAxVPVNRiSVPzHaj3s6yQ=; b=fzGNDKlrjuUPMgPQ/ujWfVXT2TAI0fZcv1eOWnP1FGDLGOLrqfkJOQoPHSR4VMaRkD jumlQqB5+0lF0lQKvvnKKN0bosMDXOdzwv6VylhiEy8tbWu2Fm/QATfh8KPgOu2Qwx6T DY/Z5PXzzWGpBIlcqVGtv8QDxFE+V9HOTghsqGuzE9W+VHIn4gzhbdQ8waiuir+GUAHO Vmdr5lnWCFfp1vdeyDnFHP+dmN459KvTzBmD+XV0bCsPMkuOyolwF8tMVDQvOqNBv97W ku/ngxM0UeRwU8xSUo+R9F2le+z+Exc7zOGLvrAjQ57iqXceA7/4Cc3PXhoHiqqmfd6o VMQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=Mvoa0dDnSsibjBSqghSkF2xAxVPVNRiSVPzHaj3s6yQ=; b=PBcKCxYZfOBA0YKLo/BYT1ZWPp21/ycjilG1qPUrDKG5Fjc0C9Pu549s2VycHyXTNh yq8i8c68wD96ssKeDIoUreQGncyVJnUE2DlaoF2ZfT92vCDLdiEJEfQNL2hRn+lABtsZ YMfcD8GI8y0AV2dzMxZHifZGDxbog8ydTTx6ZoJ4IPYypWBOkcM5vb7h2io9nHT45DHB 3SeMfy7jM+l3Ndcxu02tDfHMZALeYXl4Bae/8zHHlofbYG33vMjJkVBWciykP55tMNOC JvuAmrCqD/+ut3Yy9+nZQADI2WLgUsAJJQWHSJmjQ8RwZt8rBWVZuohXbZcBb6+Fa/eC DXKg== X-Gm-Message-State: ABUngvf6JGDYa9rRcRlqXxYFPjzqdIg5NwqhNAI+d5relyCflWAlEuh6T+kBfb6gAyMDyA== X-Received: by 10.98.159.130 with SMTP id v2mr537802pfk.48.1477047313417; Fri, 21 Oct 2016 03:55:13 -0700 (PDT) Received: from [172.29.162.254] ([172.29.162.254]) by smtp.googlemail.com with ESMTPSA id wc6sm4198471pab.47.2016.10.21.03.55.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 21 Oct 2016 03:55:12 -0700 (PDT) Message-ID: <1477047312.7065.48.camel@edumazet-glaptop3.roam.corp.google.com> From: Eric Dumazet To: "Steinar H. Gunderson" Cc: bloat Date: Fri, 21 Oct 2016 03:55:12 -0700 In-Reply-To: <20161021104712.GB35316@sesse.net> References: <20161021084726.GA1913@sesse.net> <1477045681.7065.43.camel@edumazet-glaptop3.roam.corp.google.com> <20161021104217.GA35316@sesse.net> <20161021104712.GB35316@sesse.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [Bloat] "BBR" TCP patches submitted to linux kernel X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Oct 2016 10:55:14 -0000 On Fri, 2016-10-21 at 12:47 +0200, Steinar H. Gunderson wrote: > On Fri, Oct 21, 2016 at 12:42:17PM +0200, Steinar H. Gunderson wrote: > > Perhaps it's time to kill them, but I don't know what the defaults are :-) > > If it matters (for autotuning), the host has 64 GB of physical RAM. I am working on a patch to change how EPOLLOUT events are generated, so that we can use /proc/sys/net/ipv4/tcp_notsent_lowat = 1000000 to greatly reduce amount of bytes in write queues, without a throughput reduction in presence of losses. (There is a bug at this moment, kernel fails to wakeup the writer if it receives sack blocks, consuming all not sent bytes in write queue)