From: Denys Vlasenko <vda.linux@googlemail.com>
To: Tino Keitel <tino.keitel@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Strage buffer behaviour
Date: Mon, 12 Nov 2007 12:44:53 -0700 [thread overview]
Message-ID: <200711121244.54251.vda.linux@googlemail.com> (raw)
In-Reply-To: <20071111183334.GA6770@dose.home.local>
On Sunday 11 November 2007 11:33, Tino Keitel wrote:
> The dd command reads 100 MB from each partition two times in a row. It
> looks like sda1 and sda2 are not bufferd (the first 4 dd runs), but
> sda3 and sda4 are (the last 4 dd runs).
>
> The computer is a Mac mini with a 2,5" SATA hard disk. The first 2
> partitions contain EFI and MacOS X, and are unused in Linux. The last 2
> partitions are an ext3 partition for / and an LVM for the rest of the
> sytem.
>
> Any hints how the dd/buffering behaviour could be explained? The system
> was mostly idle, and the numbers are reproducible across reboots.
IIRC only mounted partitions' reads are cached.
--
vda
next prev parent reply other threads:[~2007-11-12 19:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-11 18:33 Strage buffer behaviour Tino Keitel
2007-11-11 19:39 ` Heikki Orsila
2007-11-12 19:44 ` Denys Vlasenko [this message]
2007-11-12 20:46 ` Heikki Orsila
-- strict thread matches above, loose matches on Subject: below --
2007-11-14 11:02 Tomasz Chmielewski
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