Re: latency while writing to pc-card disks/tapes

From: Alan Cox (
Date: Sun Aug 04 2002 - 08:57:25 EST

> Another thing that surprises me is that this runs the CPU at
> full stretch, since the fan comes on. I find it hard to believe that
> writing to a rather slow tape drive can fully exercise a 1GHz
> processor continuously.
> (It may be relevant for the tape that scsi dis/reconnect is disabled,
> as it doesn't work for my card.)

PCMCIA is PIO only. Your processor is hard at work sitting waiting for
out instructions to complete across the low speed (8Mhz or so) PCMCIA
bus. Cardbus might help immensely if there are suitable cardbus adapters
around because a cardbus slot with a cardbus card (not a pcmica card) in
it is basically pure PCI

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Wed Aug 07 2002 - 22:00:24 EST