lkml.org 
[lkml]   [2003]   [Sep]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: SLOW machine when HIGHMEM enabled (1gb memory, kernel 2.4.22)
Mikael --

Thanks for the help!

I have posted my /proc/mtrr and /proc/meminfo to
http://www.layover.com/matt/kernel/ .

The "lowmem" ones are when HIGHMEM was disabled, the "highmem" ones are
2.4.22 with CONF_HIGHMEM4G. /proc/mtrr looks exatly the same whether or
not highmem is enabled.

I have the newest stable bios from Asus as of yesterday.

What should I see if the high memory isn't cachable?

On Sun, 21 Sep 2003, Mikael Pettersson wrote:

> Matt Hahnfeld writes:
> > I have an ASUS P4P800-VM motherboard with 2 sticks of 512mb PC3200 and
> > a single 2.4 ghz P4 processor. The kernel is vanilla 2.4.22 configured
> > for SMP (hyperthreading).
> >
> > When I use a kernel with high memory support off, I get good
> > performance (despite not being able to use some of my memory). When I
> > enable CONFIG_HIGHMEM4G the remaining memory is detected, but the
> > machine takes a big performance hit and starts running very slow --
> > ie. kernel compilation looks like it would take 5 days instead of 5
> > minutes. /proc/meminfo doesn't look particularly strange and no
> > strange log messages show up -- everything just runs slow...
> >
> > CONFIG_HIGHMEM64G produces the same results...
> >
> > Any suggestions?
>
> Sounds like maybe the high RAM isn't cacheable.
> What does /proc/mtrr and dmesg look like?
>
> Have you verified that you're running the latest BIOS?
>


-
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 13:48    [W:1.029 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site