Messages in this thread |  | | Date | Sun, 25 Nov 2001 22:22:14 +1300 | From | Chris Wedgwood <> | Subject | Re: Disk hardware caching, performance, and journalling |
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On Sat, Nov 24, 2001 at 11:08:17AM -0800, Andrew Morton wrote:
In theory, yes. In my opinion, no. For ext3, at least. Caching isn't bad per-se. It's reordering which can break the journalling constraints.
Some disks[1] most definately do reorder; I've actually been able to demonstrate this in some circumstances (it wasn't trivial to produce and required several attempts).
--cw
[1] SCSI, which we know does and will reorder writes when a barrier isn't specificed, it appears IDE drives can do the same but lack of hot-swap makes testing tedious :) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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