Messages in this thread | | | Date | Tue, 16 May 2006 13:19:11 -0400 | From | "Kevin Radloff" <> | Subject | Re: PATCH: Fix broken PIO with libata |
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On 5/16/06, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: > On Maw, 2006-05-16 at 11:33 -0400, Kevin Radloff wrote: > > However, I still have a problem with pata_pcmcia (that I actually > > experienced also with the ide-cs driver) where sustained reading or > > writing to the CF card spikes the CPU with nearly 100% system time. > > That is normal. The PCMCIA devices don't support DMA. As a result of > this the processor has to fetch each byte itself over the ISA speed > PCMCIA bus link.
Hrm, as I recall that only started happening with ide-cs sometime in the single digits of 2.6.x.. And note that it's only maxing out at about 1.5MB/s. Should that saturate my laptop's 1.1GHz Pentium M processor?
-- Kevin 'radsaq' Radloff radsaq@gmail.com http://thesaq.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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