linux-kernel - Re: EXT4-ish "fixes" in UBIFS

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Message-ID: <alpine.DEB.2.01.0904021938560.6162@bogon.housecafe.de>
Date:	Thu, 2 Apr 2009 19:45:24 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	Theodore Tso <tytso@....edu>
cc:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: EXT4-ish "fixes" in UBIFS

On Thu, 2 Apr 2009, Theodore Tso wrote:
> It will, but you might not like the performance....  the reason why
> it's there is that some users might want the particular tradeoff, but
> it probably wouldn't make a good default.

Thanks for confirming this. Yes, I know about the performance impact, but 
perhaps it's feasible for some setups.

Christian.

PS: I was curious *how* bad the impact was and so I tried generating a
    477 MB tarball, first on an async, then on an sync mounted partition:

   /dev/md0 /mnt/md0 ext4 rw,noatime,barrier=1,data=ordered
   $ time tar -cf /mnt/md0/test.tar /usr
   real	1m36.615s

   /dev/md0 /mnt/md0 ext4 rw,sync,noatime,barrier=1,data=ordered
   $ time tar -cf /mnt/md0/test.tar /usr
   real	5m23.793s

-- 
Bruce Schneier does not get kidney stones. He gets Rosetta Stones.
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