Hi!
14-σΕΞ-2004 22:34 [EMAIL PROTECTED] (Michael Devore) wrote to [EMAIL PROTECTED]:
MD> either in its kernel or HIMEM.SYS. FreeDOS might be able to do that and
MD> get better overall system performance since CPU caching is disabled by
MD> default. I don't know if there are any serious repercussions to doing this
MD> and how much of a measured performance improvement there might be. If
MD> there are benchmark people around who can get a good compare, a test would
MD> be simple since CR0 need only be AND'ed with NOT 0x60000000 to turn them off.
I may recommend SST (http://user.rol.ru/~dxover/speedsys/sst478.zip) to perform test of CPU and memory interface throughput.
Looks like BIOS automatically turns caching on (bits off) for me. However, under emulation, only MS-DOS has the bits reset compared to FreeDOS, so apparently MS makes sure by turning off the disable bits themselves. Not the best idea MS ever had, but guess it makes things run faster if caching a) wasn't already turned on by BIOS and b) doesn't fail compatibility with programs which have problems with caching .
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