lkml.org 
[lkml]   [2003]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Bottleneck on /dev/null
On Thu, Mar 20, 2003 at 12:01:06PM -0500, Richard B. Johnson wrote:
...
> Yes. That's better. It may have been a diagnostic error
> in the code of the first person reporting this --also.
>
> The data-rate is so high that I might have wrapped several
> times! I didn't think it would be that high, only 2 to 3
> gigibyte/second, not over 4 Gb/s (with 130MHz RAM no less)

Furthermore, in Linux you are really measuring syscall overhead
to "/dev/null" write, which does never do memory transfers of
any kind from user-space to kernel.

...
> Its interesting that the data-rate is higher with the network
> plugged in and getting all those M$ broadcast messages. But, as
> expected, its more stable without.

Quite so.

> Cheers,
> Dick Johnson

/Matti Aarnio
-
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 13:34    [W:0.057 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site