Re: About highmem in 2.6

From: Dave McCracken
Date: Wed Feb 11 2004 - 13:46:27 EST



--On Wednesday, February 11, 2004 18:47:04 +0100 Luis Miguel García
<ktech@xxxxxxxxxx> wrote:

> When I first installed 2.4, someone told me that if I had 1 gb ram it was
> better to not use highmem because those extra aditional mb was not worth
> the speed penalty of using the feature.
>
> Sorry for my ignorance (and my sucking english) but must I enable highmem
> now with 2.6? or have it any speed penalty althought?

I don't know if anyone has actually measured the relative performance, but
I'd expect the answer to be the same as 2.4. There is a small but
measurable performance penalty for enabling highmem which is higher than
the benefit of the extra 128 meg of memory you get when you have 1G. If
you have more than 1G it's better to enable highmem.

Dave McCracken

-
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/