lkml.org 
[lkml]   [2002]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: (RFC): SKB Initialization
On Wed, Aug 21, 2002 at 11:59:44AM -0500, Mala Anand wrote:
> The patch reduces the numer of cylces by 25%

The data you are reporting is flawed: where are the average cycle
times spent in __kfree_skb with the patch? Without that information,
there is no basis for conclusion as the total time spent in these
two routines is unknown. At worst, I'd have to assume this lack of
scientific method is an attempt to hide some aspect of the resulting
behaviour, but I hope that isn't the case.

-ben

> Baseline on Linux 2.5.25 kernel:
> -------------------------------
>
> CPU 0 CPU 1
> ------ ------
> Avg cycles in alloc_skb: 64.05 203.39
> Avg cycles in __kfree_skb: 127.54 228.95
> ------ -------
> Total Avg Cycles 191.59 432.34
> ------ -------
>
> # of times alloc_skb called: 235,478 2,060,422
> # of times __kfree_skb called: 2,063,276 232,359
>
>
> Linux 2.5.25+Skbinit Patch:
> --------------------------
> CPU 0 CPU 1
> ----- -----
> Avg cycles in alloc skb: 237.21 230.91
>
> # of times alloc_skb called: 1,226,594 1,213,327
-
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: 2005-03-22 13:28    [W:0.217 / U:0.940 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site