Messages in this thread | | | Date | Sun, 21 Sep 2003 17:07:58 -0400 (EDT) | From | Matt Hahnfeld <> | Subject | Re: SLOW machine when HIGHMEM enabled (1gb memory, kernel 2.4.22) |
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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? >
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