Re: CONFIG_PRINTK_TIME woes

Andrew Morton
2005-08-22T22:40:15Z

tony.luck@intel.com wrote:
>
> >How fast is printk? I haven't looked.
> >
> >ie: if you do back-to-back printk's, what's the timestamp increment?
>
> On ia64 it looks like about 4-5 usec increment for back-to-back
> printk (with no serial console configured, and dmesg -n to turn
> off messages to the VGA console).
>

Ah, thanks. Presumably it'll be considerably longer with %d's and %s's in
there. But still, ~10 usecs is good resolution for I/O operations.