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Hi Sergio! * Sergio Bruder writes: >On Sun, Apr 14, 2002 at 03:39:35PM +0300, Anssi Saari wrote: >>(...) >> >>I have now tried the writer on an old Pentium motherboard with Intel >>430HX chipset and PIIX3. The performance problems didn't happen there, >>so I would guess this is more a problem with how Linux handles the VIA >>686b southbridge. >> >>But what can I do to help fix this problem? >We are now in 2.4.20-preBLAH time and appears that VIA 686b southbridge >still has the same problem (and appears to be that dont surface with >anothers controllers) >Ive just burned a image (.cue/.bin) with cdrdao and my load went nuts, >up to 5. Same motherboard chipset, same general conditions. KT133a, >VIA 686b southbridge, in that case with a LG combo drive (HL-DT-ST >RW/DVD GCC-4120B), hard-disk as /dev/hda (with ReiserFS), combo drive >as /dev/hdc. >What is strange is that problem dont appears with ISO images >(cdrecord-burned). There is any already-know solution for that problem >with VIA686b IDE? The problem isn't really the southbridge, the problem is, that the kernel doesn't seem to use (I still didn't get a definitive answer) DMA when doing things with bigger blocksizes (grabbing audio CDs, writing DAO CDs). That's why you don't have a problem burning 'normal' TAO CDs. It seems that older chipsets just deal way better with PIO modes (the PIIX3 doesn't have DMA, does it?). For me it helped at least a bit to do the following: - Disable interrupt sharing for IDE devices - hdparm -d1 -c3 -u0 -X34/66 /dev/burner With this settings I have 30% processor usage when writing at speed 20, as opposed to at least 60% I had before. regards Markus - 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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