Re: RT 45-01: CF Card read: High latency?

2005-04-11 Thread P
I handled this issue by precaching all my files (15MB), from my readonly root filesystem. find / -type f | grep -v ^/boot | #kernel is > 1MB and never read so don't put in cache while read file; do dd bs=32k if="$file" of=/dev/null 2>/dev/null done Pádraig. - To unsubscribe from this list: send

Re: RT 45-01: CF Card read: High latency?

2005-04-11 Thread Bartlomiej Zolnierkiewicz
On Apr 11, 2005 1:38 PM, kus Kusche Klaus <[EMAIL PROTECTED]> wrote: > So the question is, what exactly is the IDE priority? > Is the PIO transfer done in the IRQ handler or in a bh? in the IRQ handler - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a mess

RT 45-01: CF Card read: High latency?

2005-04-11 Thread kus Kusche Klaus
>From the three sources of multi-millisecond latency in my experiments (console messages to dead serial console, USB I/O, CF Card bulk read), I've analyzed one: The latency of around 70 milliseconds in low-priority RT processes when running a "dd if=/dev/hda of=/dev/null" in parallel (where hda i