Weird performance behaviour in 7.0

bruce at zuhause.mn.org bruce at zuhause.mn.org
Sun Jan 27 10:33:19 PST 2008


Richard Todd writes:
 > 
 > bruce at zuhause.mn.org writes:
 > > Richard Todd writes:
 > >  > This wouldn't by any chance be an Intel 965-chipset-based motherboard
 > >  > with 4G or more of memory, would it?  Because there's an interesting
 > >  > little bug in the BIOS on some of those boards which causes the
 > >  > cache-control registers to incorrectly declare a chunk of main memory
 > >  > as uncacheable.  This results in random slowdowns depending on whether
 > >  > your process lands in the "bad" zone of memory or not.  See 
 > >  > http://article.gmane.org/gmane.os.freebsd.stable/50135/ for more details. 
 > >
 > > Bingo!  This is a Intel DG965WH with 4 GB of memory.  I don't think I
 > > can downgrade to the 1669 firmware because of the processor I'm
 > > using.  The Fedora thread says that there's a hack to do the following
 > > in linux to fix the "bad" zone

Embarrassingly, after I posted this, I realized that I was not at the
latest BIOS level, and not at a recommended level for my processor, so
I flashed it with the latest, version 1719.  Although in the Fedora
thread Jussit said that it didn't fix the problem, it seems to have
fixed it for me.  BTW, I was able to get the SMAP information at the
loader prompt.

I'm curious, though, should I be worried about the memcontrol list
entries that are listed as "set-by-firmware active bogus"?

Type '?' for a list of commands, 'help for wore detailed
OK smap
SMAP type=01 base=0000000000000000 len=000000000008f000
SMAP type=02 base=000000000008f000 len=0000000000011000
SMAP type=02 base=00000000000e0000 len=0000000000020000
SMAP type=01 base=0000000000100000 len=00000000cf461000
SMAP type=02 base=00000000cf561000 len=000000000000d000
SMAP type=0l base=00000000cf56e000 len=000000000009c000
SMAP type=04 base=00000000cf60a000 len=00000000000df000
SMAP type=01 base=00000000cf6e9000 len-0000000000009000
SMAP type=03 base=00000000cf6f2000 len=000000000000d000
SMAP type=01 base=00000000cf6ff000 len=0000000000001000
SMAP type=02 base=00000000cf700000 len=0000000000100000
SMAP type=02 base=00000000cf800000 len=0000000000800000
SMAP type=02 base=00000000fff00000 len=0000000000100000
SMAP type=01 base=0000000100000000 len=000000002c000000
OK
0x0/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x10000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x20000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x30000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x40000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x50000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x60000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x70000/0x10000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x80000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x84000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x88000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x8c000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x90000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x94000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x98000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0x9c000/0x4000 BIOS write-back fixed-base fixed-length set-by-firmware active 
0xa0000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xa4000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xa8000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xac000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xb0000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xb4000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xb8000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xbc000/0x4000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc0000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc1000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc2000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc3000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc4000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc5000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc6000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc7000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc8000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xc9000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xca000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xcb000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xcc000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xcd000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xce000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xcf000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd0000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd1000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd2000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd3000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd4000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd5000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd6000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd7000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd8000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xd9000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xda000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xdb000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xdc000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xdd000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xde000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xdf000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe0000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe1000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe2000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe3000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe4000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe5000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe6000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe7000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe8000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xe9000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xea000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xeb000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xec000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xed000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xee000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xef000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf0000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf1000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf2000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf3000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf4000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf5000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf6000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf7000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf8000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xf9000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xfa000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xfb000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xfc000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xfd000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xfe000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0xff000/0x1000 BIOS uncacheable fixed-base fixed-length set-by-firmware active 
0x0/0xf080000000 BIOS write-back set-by-firmware active bogus 
0x80000000/0xf040000000 BIOS write-back set-by-firmware active bogus 
0xc0000000/0xf010000000 BIOS write-back set-by-firmware active bogus 
0xcf800000/0xf000800000 BIOS uncacheable set-by-firmware active bogus 
0xcf700000/0xf000100000 BIOS uncacheable set-by-firmware active bogus 
0x100000000/0xf020000000 BIOS write-back set-by-firmware active bogus 
0x120000000/0xf008000000 BIOS write-back set-by-firmware active bogus 


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