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From: bzzz@gerasimov.net
To: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: Fw: Re: ICP, 3ware,  Areca?
Date: Wed, 08 Nov 2006 00:06:22 +0300	[thread overview]
Message-ID: <m31wof2chd.fsf@bzzz.home.net> (raw)
In-Reply-To: <1162933193.8123.36.camel@kleikamp.austin.ibm.com> (Dave Kleikamp's message of "Tue, 07 Nov 2006 14:59:52 -0600")

>>>>> Dave Kleikamp (DK) writes:

 DK> On Tue, 2006-11-07 at 11:47 -0800, Andrew Morton wrote:
 >> Why is ext3 slow??

 DK> Allocation?  I don't see anything indicating that Bill is overwriting an
 DK> existing file, so there is block allocation and journaling overhead.  If
 DK> that's the case, it would be interesting to see how fast ext3 is when
 DK> overwriting a file.  Extents and delayed allocation should improve on
 DK> this a lot.  

this was my first suspiction as well. though in my testing on opteron
write achieved ~300MB/s consuming 100% cpu. so it would be interesting
to see vmstat output and actual cpu consumption.

thanks, Alex

  reply	other threads:[~2006-11-07 21:07 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-11-07 19:47 Fw: Re: ICP, 3ware, Areca? Andrew Morton
2006-11-07 19:55 ` Alex Tomas
2006-11-07 20:59 ` Dave Kleikamp
2006-11-07 21:06   ` bzzz [this message]
2006-11-07 21:45   ` Andrew Morton
2006-11-07 22:07     ` Bill Rugolsky Jr.
2006-11-07 22:20     ` Bill Rugolsky Jr.

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