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Date: Fri, 16 Feb 2007 09:13:21 +0000 From: Jörn Engel <joern@...ybastard.org> To: Juan Piernas Canovas <piernas@...ec.um.es> Cc: Jan Engelhardt <jengelh@...ux01.gwdg.de>, sfaibish <sfaibish@....com>, kernel list <linux-kernel@...r.kernel.org> Subject: Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation On Thu, 15 February 2007 23:59:14 +0100, Juan Piernas Canovas wrote: > > > Actually, the version of DualFS for Linux 2.4.19 implements a cleaner. In > our case, the cleaner is not really a problem because there is not too > much to clean (the meta-data device only contains meta-data blocks which > are 5-6% of the file system blocks; you do not have to move data blocks). That sounds as if you have not hit the "interesting" cases yet. Fun starts when your device is near-full and you have a write-intensive workload. In your case, that would be metadata-write-intensive. For one, this is where write performance of log-structured filesystems usually goes down the drain. And worse, it is where the cleaner can run into a deadlock. Being good where log-structured filesystems usually are horrible is a challenge. And I'm sure many people are more interested in those performance number than in the ones you shine at. :) Jörn -- Joern's library part 14: http://www.sandpile.org/ - 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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