On 11/10/2010 09:15 PM, Marco Stornelli wrote: > 2010/11/9 Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>: >> On Tue, Nov 9, 2010 at 21:35, Ryan Mallon <ryan@xxxxxxxxxxxxxxxx> wrote: >>> You can still do all of those things without having a fixed endianess. >>> You just have to have one extra step of telling the external tools what >>> the endianess is. IMHO, it is better to have the overhead of the endian >>> conversion in the tools since it is less costly there than an the >>> embedded system. >>> >>> I'm just trying to understand why the fixed endianess rule cannot be >>> bent for such a specialised filesystem. >> >> When it was decided that filesystems should be fixed-endian and support for >> big-endian ext2 was dropped, the overhead of doing the fixed conversions was >> deetermined negligible due to compiler optimization. >> That was ages ago, and current embedded systems run circles around the >> machines of those days. >> >> Note that this is about metadata only. Actual file contents are always just >> byte streams. >> > > I can add that the penalties in this case are negligible due to the > compensation of the very fast access of the media. In addition, from > performance point of view I'm pretty happy (you can see the some > benchmark on the project web site). Thanks for the explanation guys. ~Ryan -- Bluewater Systems Ltd - ARM Technology Solution Centre Ryan Mallon 5 Amuri Park, 404 Barbadoes St ryan@xxxxxxxxxxxxxxxx PO Box 13 889, Christchurch 8013 http://www.bluewatersys.com New Zealand Phone: +64 3 3779127 Freecall: Australia 1800 148 751 Fax: +64 3 3779135 USA 1800 261 2934 -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
