From: Ming Zhang <mingz@ele.uri.edu>
To: Dan Christensen <jdc@uwo.ca>
Cc: David Greaves <david@dgreaves.com>,
Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: RAID-5 streaming read performance
Date: Thu, 14 Jul 2005 10:23:37 -0400 [thread overview]
Message-ID: <1121351017.5544.29.camel@localhost.localdomain> (raw)
In-Reply-To: <1121344255.5544.7.camel@localhost.localdomain>
my problem here. this only apply to sdX not mdX. pls ignore this.
ming
On Thu, 2005-07-14 at 08:30 -0400, Ming Zhang wrote:
> > Also, is there a way to disable caching of reads? Having to clear
> > the cache by reading 900M each time slows down testing. I guess
> > I could reboot with mem=100M, but it'd be nice to disable/enable
> > caching on the fly. Hmm, maybe I can just run something like
> > memtest which locks a bunch of ram...
> after you run your code, check the meminfo, the cached value might be
> much lower than u expected. my feeling is that linux page cache will
> discard all cache if last file handle closed.
>
next prev parent reply other threads:[~2005-07-14 14:23 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-11 15:11 RAID-5 streaming read performance Dan Christensen
2005-07-13 2:08 ` Ming Zhang
2005-07-13 2:52 ` Dan Christensen
2005-07-13 3:15 ` berk walker
2005-07-13 12:24 ` Ming Zhang
2005-07-13 12:48 ` Dan Christensen
2005-07-13 12:52 ` Ming Zhang
2005-07-13 14:23 ` Dan Christensen
2005-07-13 14:29 ` Ming Zhang
2005-07-13 17:56 ` Dan Christensen
2005-07-13 22:38 ` Neil Brown
2005-07-14 0:09 ` Ming Zhang
2005-07-14 1:16 ` Neil Brown
2005-07-14 1:25 ` Ming Zhang
2005-07-13 18:02 ` David Greaves
2005-07-13 18:14 ` Ming Zhang
2005-07-13 21:18 ` David Greaves
2005-07-13 21:44 ` Ming Zhang
2005-07-13 21:50 ` David Greaves
2005-07-13 21:55 ` Ming Zhang
2005-07-13 22:52 ` Neil Brown
2005-07-14 3:58 ` Dan Christensen
2005-07-14 4:13 ` Mark Hahn
2005-07-14 21:16 ` Dan Christensen
2005-07-14 21:30 ` Ming Zhang
2005-07-14 23:29 ` Mark Hahn
2005-07-15 1:23 ` Ming Zhang
2005-07-15 2:11 ` Dan Christensen
2005-07-15 12:28 ` Ming Zhang
2005-07-14 12:30 ` Ming Zhang
2005-07-14 14:23 ` Ming Zhang [this message]
2005-07-14 17:54 ` Dan Christensen
2005-07-14 18:00 ` Ming Zhang
2005-07-14 18:03 ` Dan Christensen
2005-07-14 18:10 ` Ming Zhang
2005-07-14 19:16 ` Dan Christensen
2005-07-14 20:13 ` Ming Zhang
2005-07-15 2:38 ` Dan Christensen
2005-07-15 6:01 ` Holger Kiehl
2005-07-15 12:29 ` Ming Zhang
2005-07-13 22:42 ` Neil Brown
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