I just made some tests with UDMA2 and had some unexpected results:
Why is FreeDOS so much slower (60% no UDMA, 14% with UDMA)???
Is this consistent with other experiments?
Please, I would like to here comments on this ;-)
UDMA 7.0 and UDMA2 2.5 had the same performance.
On instalation it says mode 6, speed= 105Mb/s
testing with RAWSPEED 2.2 (from older udma versions) writes/reads a
256Mb file to disk (figures in Mb/s)
FreeDOS MS-DOS7.10
No UDMA, no cache R=1.4 W=1.4 R=2.3 W=2.8
No UDMA, cache R=1.3 W=1.4 R=2.3 W=2.7
UDMA2, no cache R=6.3 W=4.4 R=54.2 W=16.0
UDMA2, cache R=5.5 W=4.4 R=39.5 W=15.7
FreeDOS kernel= , lbacache 22sep2004 with tickle, Himem/emm386 v2.01
MSDOS from Win98se, cache=smartdrv, himem/emm386
Machine is AMD Semprom 2.2GHz, PcChips with SiS741GX, Disk is 2Gb
partition at the beginning of 40Gb
Thanks a lot,
Alain
PS. sorry for the post to devel+kernel but some people don't read both.
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