Re: Slowdown with randomize_va_space in 2.6.12.2

[David S. Miller]

From: Paulo Marques <pmarques@xxxxxxxxxxxx>
Date: Wed, 06 Jul 2005 15:23:56 +0100

> What is weird is that most of the extra time is being accounted as 
> user-space time, but the user-space application is exactly the same in 
> both runs, only the "randomize_va_space" parameter changed.

It might be attributable to more cpu cache misses in userspace since
the virtual addresses of everything are changing each and every
invocation.

But 2 seconds more of execution time is quite a lot.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/