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Date: Thu, 2 Apr 2009 20:49:55 -0600 From: "Trenton D. Adams" <trenton.d.adams@...il.com> To: Christian Kujau <lists@...dbynature.de> Cc: Theodore Tso <tytso@....edu>, Artem Bityutskiy <Artem.Bityutskiy@...ia.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: EXT4-ish "fixes" in UBIFS On Thu, Apr 2, 2009 at 8:45 PM, Christian Kujau <lists@...dbynature.de> wrote: > 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 lol, yep sounds about right. Probably much worse on my machine, given the disk speed is around 20-23M/sec. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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