linux-kernel - Re: Strage buffer behaviour

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071111193926.GH8865@zakalwe.fi>
Date:	Sun, 11 Nov 2007 21:39:26 +0200
From:	Heikki Orsila <shdl@...alwe.fi>
To:	linux-kernel@...r.kernel.org
Subject: Re: Strage buffer behaviour

On Sun, Nov 11, 2007 at 07:33:35PM +0100, Tino Keitel wrote:
> I noticed that the kernel (2.6.23.1) seems to buffer only certain
> partitions on my system:
> 
> $ for i in 1 2 3 4 ; do for j in 1 2 ; do dd if=/dev/sda$i of=/dev/null
> bs=1024k count=100 ; done ; done
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 3.01471 seconds, 34.8 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 2.86945 seconds, 36.5 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 2.92038 seconds, 35.9 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 3.00272 seconds, 34.9 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 4.07722 seconds, 25.7 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 0.0944248 seconds, 1.1 GB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 5.61527 seconds, 18.7 MB/s
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 0.331822 seconds, 316 MB/s
> 
> 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).

Strange.. I'm running 2.6.24-rc1 here. Reading data from /dev/hda1 
caches well, but not from /dev/sd[ab]1.

PS. you can flush caches with:

	echo 1 > /proc/sys/vm/drop_caches

-- 
Heikki Orsila			Barbie's law:
heikki.orsila@....fi		"Math is hard, let's go shopping!"
http://www.iki.fi/shd
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/