lkml.org 
[lkml]   [2005]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Attempted summary of "RT patch acceptance" thread, take 2
From
Date
On Mon, 2005-07-11 at 10:19 -0700, Paul E. McKenney wrote:

> OK, interesting point, though this would apply only to interrupt latency,
> not to scheduling latency or to latency for any other system services,
> right?

Only for interrupt latency, that I know of.

> Do you believe that the 50-us delay measured by Kristian and Karim was
> due to APM or due to hardware (as Karim suspected)? If the latter,
> any guesses as to the cause of the holdup? 50 us is a -really- long
> time for ~100 instructions on today's hardware, even if each instruction
> misses the cache!

There are ~100 interrupt off critical sections. Those sections can be
variable numbers of instructions. I would imagine that whatever maximum
latency that Kristian and Karim found is the maximum for their hardware.

Daniel

-
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/

\
 
 \ /
  Last update: 2005-07-11 19:33    [W:0.256 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site