From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 27DAD138330 for ; Thu, 22 Sep 2016 00:30:17 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id B3E0FE08E9; Thu, 22 Sep 2016 00:30:06 +0000 (UTC) Received: from mail-qk0-f176.google.com (mail-qk0-f176.google.com [209.85.220.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id DDD3DE085C for ; Thu, 22 Sep 2016 00:30:05 +0000 (UTC) Received: by mail-qk0-f176.google.com with SMTP id t7so62443616qkh.2 for ; Wed, 21 Sep 2016 17:30:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=Sih2JoXKC0fJ2mj6rsDP7ZtG6O6gp6Yvffmuyxmt45E=; b=R1O0602G88EWTNLPQOnoyEOAqXJ5TiNCUqYlMMMiGUzoogbLp07I8f3bvuoq8Om85Z QNjfYOM5KqTxjGxn5cBQQJbeAb3rN+TgiKf+i20EyL9dp2rfz9gik7XfjDC3ie0aAart RbXQrZ1Gmik6G0w2vVRNVEAt+cxdCMwITx4QIyxTxNXkRD+725nZ5Eikn77xRJU95a7d ZgMSxcRC2XYxWfjtadpI8tHI9atmlPd1SYWVmNr+8ou8w0Xb8kJPPtsL9Y2DAmvOAjeR i+p5Y5GA5PQt+KwuyRf15yQedii8rBIPGwTPSPyYzK9CCXHARm+ZSt5HwONnf6u9GOF7 Z7UQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=Sih2JoXKC0fJ2mj6rsDP7ZtG6O6gp6Yvffmuyxmt45E=; b=CyaXU7VDviGI/dWKmJryKNbu9/AqtEpVSTecchFlSwBrP8QADxxAHWPkCUKEUjssNz Ai/ZszraNyQMpofnP8PHi+XGp6E0NWqCVeYZ5qevQn6QRUIB5eJqGBjLmIJ1tn9/hUeQ TADezEfFUcqTEtQmpFEd4REEDPKxQGoVmWDzfa1gQQn8SOL1Th+kWsJJ7GVUVfW6J5Yf sAji+fxmN74cjhzfjtvJJIGygD534v2at+gNLuSGMA2hQqEdWxexwl5JSSCOZy8qHEIA TAKIjMOC8/zQ5HCULc3Vn7cmlleL91rDBSozTmuAoMhiZFmPrveGP2KFkYXCjHyiEEo/ igNg== X-Gm-Message-State: AE9vXwNeVTF6XfcfAUTmP+RVxefTdZDaCpmwIiiSYf0DEDHV450UwEoxDWTpS6p9nSsQu/sVleDhrnj4oElmHg== X-Received: by 10.55.217.83 with SMTP id u80mr43044374qki.171.1474504204856; Wed, 21 Sep 2016 17:30:04 -0700 (PDT) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.140.38.179 with HTTP; Wed, 21 Sep 2016 17:30:04 -0700 (PDT) In-Reply-To: <2623549.Xjt69W3Giq@serenity> References: <20160921221839.29ceae91@jupiter.sol.kaishome.de> <2623549.Xjt69W3Giq@serenity> From: Grant Date: Wed, 21 Sep 2016 17:30:04 -0700 Message-ID: Subject: Re: [gentoo-user] Re: TCP Queuing problem To: Gentoo mailing list Content-Type: text/plain; charset=UTF-8 X-Archives-Salt: 96d4c4fe-11fe-4d05-8d1c-a7130aa8bb34 X-Archives-Hash: 827649dd5b351263cd8a92c7527f3545 >> >> I haven't mentioned it yet, but several times I've seen the website >> >> perform fine all day until I browse to it myself and then all of a >> >> sudden it's super slow for me and my third-party monitor. WTF??? >> > >> > I had a similar problems once when routing through a IPsec VPN tunnnel. >> > I needed to reduce MTU in front of the tunnel to make it work >> > correctly. But I think your problem is different. >> >> I'm not using IPsec or a VPN. >> >> > Does the http server backlog on the other side? Do you have performance >> > graphs for other parts of the system to see them in relation? Maybe >> > some router on the path doesn't work as expected. >> >> I've attached a graph of http response time, CPU usage, and TCP >> queueing over the past week. It seems clear from watching top, iotop, >> and free than my CPU is always the bottleneck on my server. > > I'm going to throw one more tool at you; give atop a try. (htop is nice, too, > but atop is more powerful.) I think I got it. I'll post all the gory details shortly. - Grant