From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1QCf7U-0006km-HX for garchives@archives.gentoo.org; Wed, 20 Apr 2011 21:39:36 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id CF66E1C00B; Wed, 20 Apr 2011 21:38:09 +0000 (UTC) Received: from mail-ww0-f53.google.com (mail-ww0-f53.google.com [74.125.82.53]) by pigeon.gentoo.org (Postfix) with ESMTP id 7FEBF1C00B for ; Wed, 20 Apr 2011 21:38:09 +0000 (UTC) Received: by wwj40 with SMTP id 40so1287605wwj.10 for ; Wed, 20 Apr 2011 14:38:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:from:reply-to:to:subject:date:user-agent :references:in-reply-to:mime-version:content-type :content-transfer-encoding:message-id; bh=/u6L2riLiR3q6l60eNkOICMuDiQjUt50bbccn33bORw=; b=seaKcNvN3K2XdVPgkwqja7cD3wePQl6EOlE7pu0PYr31KsuqAgNn48JrLQTcJ+nO2X N+xe5F0r6kZrmqx1BZMpbifVXMOhgKE+bCE0TJ653JoF8oMDf/kwipVkb4oV3mQXRo0W 9qLkktVaD8q9hcA0yfY935gyC86rnlLcfyVts= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:reply-to:to:subject:date:user-agent:references:in-reply-to :mime-version:content-type:content-transfer-encoding:message-id; b=Td55gTM9kL57KLNW9Pflzr56yxQXh9cMVI7TOstzmTWiytPegNVvukvBP/XSwdrN4e wjamTjIRqUbmW8DdAMeUpzTFz1v9zZgI5OgtPxHzx/K5oeNpIoQK5BiIc/Ny/76a2YqT ejbcdpxV6kYQvOUsT6qY7dXPW4xpqoAQ8xvq8= Received: by 10.216.245.4 with SMTP id n4mr7697179wer.88.1303335488564; Wed, 20 Apr 2011 14:38:08 -0700 (PDT) Received: from dell_xps.localnet (230.3.169.217.in-addr.arpa [217.169.3.230]) by mx.google.com with ESMTPS id f52sm664191wes.35.2011.04.20.14.38.06 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 20 Apr 2011 14:38:07 -0700 (PDT) From: Mick To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Howzat! Date: Wed, 20 Apr 2011 22:38:26 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.37-gentoo-r4; KDE/4.4.5; x86_64; ; ) References: <201104180228.59487.peter@humphrey.ukfsn.org> <20110420134214.BA40026C3@data.antarean.org> <201104202206.09302.alan.mckinnon@gmail.com> In-Reply-To: <201104202206.09302.alan.mckinnon@gmail.com> 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="nextPart1807490.6GPWXQh3CT"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <201104202238.36927.michaelkintzios@gmail.com> X-Archives-Salt: X-Archives-Hash: 70e4e2669c0318375c1818397cd256bf --nextPart1807490.6GPWXQh3CT Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable On Wednesday 20 April 2011 21:06:09 Alan McKinnon wrote: > Apparently, though unproven, at 15:41 on Wednesday 20 April 2011, Joost >=20 > Roeleveld did opine thusly: > > Alan, > >=20 > > I would love to do a better test then this. > > Reason I took Openoffice is because it's known to be a large build > > (requires a lot of diskspace) and takes a long time. > >=20 > > If you know which other ebuilds might make for a better test, I will be > > happy to redo the test with those. >=20 > Completely off the top of my head, I can't think of anything that > extensively uses disk space while compiling. There is the configure step, > and that hits the disk pretty hard, mostly reads. Building all of KDE > would fit the bill for disk IO methinks. >=20 > However, you will also hit that infernal disk cache issue and render the > test useless (it's all in RAM anyway after the first read!). So you would > have to disable that. >=20 > I don't know how to disable disk caching :-( > Maybe you can't, the kernel is clearly designed to use the feature if it > can at all. Maybe there's a knob in /proc you can twiddle. >=20 > Any kernel knob experts around? No expert here of course, but as long as we are talking about disk buffers= =20 hdparm used to be able to enable/disable read aheads (A1/A0). Not sure if= =20 sdparm does the same for SATA drives, or indeed if it contains any such=20 option. =2D-=20 Regards, Mick --nextPart1807490.6GPWXQh3CT Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) iEYEABECAAYFAk2vUlwACgkQVTDTR3kpaLY77QCeNXc02tCm5qFh6I34WGlH7w5y xPcAoMjOHZ4+U6vNadza6GhrGIokuhcn =tBgW -----END PGP SIGNATURE----- --nextPart1807490.6GPWXQh3CT--