Re: [PATCH] 2.6, 2.4, Nforce2, Experimental idle halt workaround instead of apic ack delay.

[Mikael Pettersson]

Ross Dickson writes:
 > > Something else that strikes me as odd, is that 2.6.3-mm like I built it,
 > > immediately locks up solid if you omit apic_tack=2, but 2.4 with acpi and
 > > apic enabled, without Ross' patches would not react this vigorously.
 > 
 > I have found it to be the 1000Hz timer ticks by default in 2.6 whereas in
 > 2.4 you only have 100Hz ticks. By default you can have 10 times the quantity of
 > disconnects and reconnects per second with 2.6 as compared with 2.4. 
 > The -CPU? -Chipset? -memory? -power supply? -track layout? -bios timings? etc.
 > combo the way it is set up on a lot of Nforce2 boards cannot hack it.

One option is to reduce HZ, by e.g. applying
http://www.csd.uu.se/~mikpe/linux/patches/2.6/patch-config-hz-2.6.3
and selecting CONFIG_HZ_100.

I did this originally to prevent clock slowdown on a 486 during
heavy disk I/O, but at least one person reported that it helped
his PIII as well: that could very well have been a chipset or
#SMM BIOS issue.
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