On Wed, 30 Mar 2005 13:52:05 +0200, kus Kusche Klaus <[EMAIL PROTECTED]> wrote:
> However, things break seriously when exercising the CF card in parallel > (e.g. with a dd if=/dev/hda of=/dev/null): > > * The rtc *interrupt handler* is delayed for up to 250 *micro*seconds. > This is very bad for my purpose, but easy to explain: It is roughly the > time needed to transfer 512 Bytes from a CF card which can transfer 2 > Mbyte/sec, and obviously, the CPU blocks all interrupts while making pio > > transfers. (Why? Is this really necessary?) > > (I know because I instrumented the rtc irq handler with rdtscl(), too) hdparm -u1 /dev/hda should help - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
