linux-ext4 - Re: [Jfs-discussion] benchmark results

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Date:	Fri, 25 Dec 2009 10:51:05 -0800 (PST)
From:	Christian Kujau <lists@...dbynature.de>
To:	Larry McVoy <lm@...mover.com>
cc:	tytso@....edu, jfs-discussion@...ts.sourceforge.net,
	linux-nilfs@...r.kernel.org, xfs@....sgi.com,
	reiserfs-devel@...r.kernel.org,
	Peter Grandi <pg_jf2@....for.sabi.co.UK>,
	ext-users <ext3-users@...hat.com>, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: [Jfs-discussion] benchmark results

On Fri, 25 Dec 2009 at 08:22, Larry McVoy wrote:
> Dudes, sync() doesn't flush the fs cache, you have to unmount for that.

Thanks Larry, that was exactly my point[0] too, I should add that to the 
results page to avoid further confusion or misassumptions:

   > Well, I do "sync" after each operation, so the data should be on
   > disk, but that doesn't mean it'll clear the filesystem buffers 
   > - but this doesn't happen that often in the real world too.

I realize however that on the same results page the bonnie++ tests were 
run with a filesize *specifically* set to not utilize the filesystem 
buffers any more but the measure *disk* performance while my "generic* 
tests do something else - and thus cannot be compared to the bonnie++ or 
hdparm results.

> No idea if that is still supported, but sync() is a joke for benchmarking.

I was using "sync" to make sure that the data "should" be on the disks 
now, I did not want to flush the filesystem buffers during the "generic" 
tests.

Thanks,
Christian.

[0] http://www.spinics.net/lists/linux-ext4/msg16878.html
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