From: Rik van Riel <riel@surriel.com>
To: Valdis.Kletnieks@vt.edu
Cc: lsorense@csclub.uwaterloo.ca (Lennart Sorensen),
Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org
Subject: Re: WANTED: kernel projects for CS students
Date: Fri, 2 Nov 2007 23:36:15 -0400 [thread overview]
Message-ID: <20071102233615.6dc90e35@bree.surriel.com> (raw)
In-Reply-To: <12100.1194059303@turing-police.cc.vt.edu>
On Fri, 02 Nov 2007 23:08:23 -0400
Valdis.Kletnieks@vt.edu wrote:
> IBM's AIX supported file system compression on the JFS filesystem
> years ago. I was able to get up to 30% throughput increases by
> converting the /usr filesystem to compressed - because even a 33mhz
> Power chipset could read in 5 512-byte blocks and decompress it to
> the original 4K faster than the disk could read in 8 512-byte
> blocks.
> Given that today there's an even *bigger* disparity in CPU speed
> versus disk speed, I'd be surprised if it doesn't help today too.
The problem is that disk seek times have not gotten much
faster over the years, while disk throughput rates have
skyrocketed.
Transferring a little less data is not going to help you
when 80% of your disk time is spent seeking, not reading
or writing.
--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan
next prev parent reply other threads:[~2007-11-03 3:36 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-14 23:01 Rik van Riel
2007-10-15 10:40 ` WANG Cong
2007-10-15 17:13 ` Rik van Riel
2007-10-15 14:23 ` Sam Ravnborg
2007-10-15 15:10 ` Rik van Riel
2007-10-15 18:31 ` Sam Ravnborg
2007-10-15 16:31 ` Philippe Elie
2007-10-15 16:36 ` Philippe Elie
2007-10-15 16:52 ` Jan Engelhardt
2007-10-15 16:53 ` Xavier Bestel
2007-10-15 18:19 ` Sam Ravnborg
2007-10-15 15:40 ` Jörn Engel
2007-10-15 17:04 ` Doug Whitesell (LKML)
2007-10-15 17:04 ` Mark Gross
2007-10-15 18:30 ` Sam Ravnborg
2007-10-15 18:45 ` Mark Gross
2007-10-15 19:54 ` Giacomo Catenazzi
2007-10-16 20:06 ` Mark Gross
2007-10-16 20:09 ` Jan Engelhardt
2007-10-16 20:23 ` Rik van Riel
2007-10-16 20:25 ` Jan Engelhardt
2007-10-16 21:10 ` david
2007-10-16 21:30 ` david
2007-11-02 7:54 ` Giacomo Catenazzi
2007-10-16 20:31 ` Giacomo Catenazzi
2007-10-15 19:17 ` Alexey Dobriyan
2007-10-15 19:54 ` Folkert van Heusden
2007-10-16 20:10 ` Mark Gross
2007-10-16 0:39 ` david
2007-10-15 17:10 ` Zan Lynx
2007-10-15 17:23 ` Rik van Riel
2007-10-16 0:51 ` david
2007-10-15 17:30 ` Guilherme Amadio
2007-10-15 18:03 ` J. Bruce Fields
2007-10-17 17:45 ` Mark Gross
2007-10-18 4:51 ` Toshiharu Harada
2007-10-28 18:07 ` Pavel Machek
2007-10-28 18:57 ` Rafael J. Wysocki
2007-10-29 19:48 ` Lennart Sorensen
2007-10-29 20:19 ` Pavel Machek
2007-10-29 21:44 ` Lennart Sorensen
2007-11-03 3:08 ` Valdis.Kletnieks
2007-11-03 3:36 ` Rik van Riel [this message]
2007-11-03 9:44 ` Wander Winkelhorst
2007-11-03 10:05 ` david
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