Messages in this thread | | | Date | Fri, 6 Aug 2004 20:27:47 +0100 | From | Russell King <> | Subject | Re: ide-cs using 100% CPU |
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On Sun, Jul 18, 2004 at 10:30:16AM +0100, Hamie wrote: > Anyone know why this happens? Something busy waiting? (BUt that should > show as system cpu right?) or something taking out really long locks?
It'll be because IDE is using PIO to access the CF card, which could have long access times (so reading a block of sectors could take some time _and_ use CPU.) Obviously, PIO requires the use of the CPU, so the CPU can't be handed off to some other task while this is occuring.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - 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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