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SubjectRe: test10-pre1 problems on 4-way SuperServer8050
On Thu, 12 Oct 2000, Tigran Aivazian wrote:

> On Wed, 11 Oct 2000, Linus Torvalds wrote:
> > What happens if MTRR support is entirely disabled?
>
> If MTRR support is disabled then both eepro100 interfaces work fine but
> the system is still 40x slower. This is the entire bootlog of
> 2.4.0-test10-pre1 + lspci-vvx + /proc/interrupts + /proc/iomem + ifconfig
> output

one more finding -- deleting the strange 64M mtrr entry enabled the second
eepro100 interface!

# cat /proc/mtrr
reg00: base=0x00100000000 ( 4096MB), size= 2048MB: write-combining,
count=1
reg02: base=0xfc000000 (4032MB), size= 64MB: uncachable, count=1
#
# echo "disable=2" > /proc/mtrr
# cat /proc/mtrr
reg00: base=0x00100000000 ( 4096MB), size= 2048MB: write-combining,
count=1

(now down and up the interface and it works. Both eepro100 work)

but the machine is still intolerably slow. Where did this 64M entry come
from? (I don't have agp or drm support enabled or anything like that, I
don't even have an agp bus!) It would be nice if /proc/mtrr showed eip of
the caller who set up the entry :)

Regards,
Tigran

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