Messages in this thread |  | | From | "H. Peter Anvin" <> | Subject | Re: Journaling pointless with today's hard disks? | Date | 26 Nov 2001 16:52:52 -0800 |
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Followup to: <9tumf0$dvr$1@cesium.transmeta.com> By author: "H. Peter Anvin" <hpa@zytor.com> In newsgroup: linux.dev.kernel > > Indeed; having explicit write barriers would be a very useful feature, > but the drives MUST default to strict ordering unless reordering (with > write barriers) have been enabled explicitly by the OS. >
On the subject of write barriers... such a setup probably should have a serial number field for each write barrier command, and a "WAIT FOR WRITE BARRIER NUMBER #" command -- which will wait until all writes preceeding the specified write barrier has been committed to stable storage. It might also be worthwhile to have the equivalent nonblocking operation -- QUERY LAST WRITE BARRIER COMMITTED.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - 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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