73 lines
2.9 KiB
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73 lines
2.9 KiB
HTML
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<TITLE>The Linux Ultra-DMA Mini-Howto: Unified IDE Patches</TITLE>
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<H2><A NAME="unified"></A> <A NAME="s7">7. Unified IDE Patches</A></H2>
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<P>
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<P>The unified IDE patches provide support for many chipsets and offboard cards,
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and are available for 2.0.x, 2.2.x, and the 2.3.x development kernels. If your
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chipset isn't supported by a current stock kernel, you'll want to patch it with
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these.
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<P>The unified IDE code is maintained by
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<A HREF="mailto:andre@suse.com">Andre Hedrick</A>,
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and patches are available at
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<A HREF="http://www.kernel.org/pub/linux/kernel/people/hedrick">your local kernel archive mirror</A>.
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<P>UDMA support is provided for at least the following chipsets, and probably
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many more I don't know about:
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<P>
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<UL>
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<LI>All Intel chipsets: FX, HX, VX, TX, LX</LI>
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<LI>All SiS chipsets (only SiS5598 tested, but this entire family of
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chipsets has the same bult-in 5513 interface device).</LI>
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<LI>VIA chipsets (only 82C586B tested, but again this family of
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chipsets has the same interface structure). Special diagnostics
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support is available for the VIA interfaces.</LI>
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<LI>Promise and Artop PCI UDMA interface cards support.</LI>
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<LI>Aladdin V (ALi15x3) chipset</LI>
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<LI>HPT343 board and HPT366 onboard chipset (caveat, see
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<A HREF="Ultra-DMA-6.html#hpt366">Abit BP-6</A>)</LI>
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</UL>
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<P>It is also designed to be easy to extend to support other chipsets.
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<P>Here are a few notes from Andre Balsa, the author of an earlier patch:
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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Performance with IBM UDMA drives on a good motherboard approches the
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maximum head transfer rates: about 10 Mb/s (measured with hdparm -t -T).
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The Intel TX chipset has a single FIFO for hard disk data shared by
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its two IDE interfaces, so using 2 UDMA drives will not yield such a
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great improvement over a single UDMA drive.
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However, the SiS5598 has two completely separate interfaces, each with
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its own FIFO. Theoretically, one could approach 66Mb/s burt transfer
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rates on motherboards with the SiS5598 chip, using the md driver and
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data striping over two drives. The SiS5571 has the same interface
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architecture, I think. I don't have the VIA chipsets datasheets, so I
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can't say anything about those.
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The Linux IDE (U)DMA kernel driver by Mark Lord has a particularly
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low setup time (i.e. latency for data transfers). It is ideal for
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frequent, small data transfers (such as those in Linux news servers),
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and might be in some cases superior to its SCSI counterparts.
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</PRE>
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</CODE></BLOCKQUOTE>
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<P>
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<P>
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<HR>
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