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[207.242.234.66]) by smtp.gmail.com with ESMTPSA id r124sm12879104itc.19.2016.09.21.14.44.55 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 21 Sep 2016 14:44:55 -0700 (PDT) From: Michael Mol To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: TCP Queuing problem Date: Wed, 21 Sep 2016 17:44:52 -0400 Message-ID: <2623549.Xjt69W3Giq@serenity> User-Agent: KMail/4.14.10 (Linux/4.4.6-gentoo; KDE/4.14.24; x86_64; ; ) In-Reply-To: References: <20160921221839.29ceae91@jupiter.sol.kaishome.de> 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 Content-Type: multipart/signed; boundary="nextPart9909759.Dx34Be1LBb"; micalg="pgp-sha256"; protocol="application/pgp-signature" X-Archives-Salt: a238cc43-7e96-49f7-b42a-e6cd84e957bd X-Archives-Hash: 421c8ccf9322f86863ed494c535b8c0b --nextPart9909759.Dx34Be1LBb Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" On Wednesday, September 21, 2016 01:47:28 PM Grant wrote: > >> I haven't mentioned it yet, but several times I've seen the websit= e > >> 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??? > >=20 > > I had a similar problems once when routing through a IPsec VPN tunn= nel. > > I needed to reduce MTU in front of the tunnel to make it work > > correctly. But I think your problem is different. >=20 > I'm not using IPsec or a VPN. >=20 > > Does the http server backlog on the other side? Do you have perform= ance > > graphs for other parts of the system to see them in relation? Maybe= > > some router on the path doesn't work as expected. >=20 > 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,=20 but atop is more powerful.) =2D-=20 :wq --nextPart9909759.Dx34Be1LBb Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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