Messages in this thread | | | Date | Sun, 21 Sep 2003 22:35:00 +0200 | From | Mikael Pettersson <> | Subject | Re: SLOW machine when HIGHMEM enabled (1gb memory, kernel 2.4.22) |
| |
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/
| |