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SubjectIDE DMA slower in 2.3.99pre3 than in 2.2.14 and in 2.0.36
According to both hdparm and 'dd'.

Results, in MB/sec, for hdparm:

buffer cache reads buffered disk reads
2.2.14 multcount=0 36.26 10.58
2.2.14 multcount=8 36.36 10.27

2.3.99pre3 multcount=0 36.99 8.11
2.3.99pre3 multcount=8 36.89 8.86

2.3.99pre3 idebus=66 37.21 8.13
2.3.99pre3 idebus=66 36.78 8.65

More - fishing in my old e-mail I can see that in 2.0.36 I used to
be able to run dd if=/dev/hda of=/dev/null bs=4096 count=16384 in

0.04user 1.90system 0:06.42elapsed 30%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (81major+11minor)pagefaults 0swaps

while 2.3.99-pre3 idebus=66 multcount=8 only gets to

0.02user 2.34system 0:08.91elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (105major+13minor)pagefaults 0swaps

It seems we're far slower than we used to be... this is a Quantum
Fireball SE4.3A, QDI Titanium IB board, TX430 chipset @66Mhz,
AMD K6-200 with 64MB 10ns SDRAM.

Thanks for any input,

--alessandro <> <>

Linux 2.2.14/2.3.99-pre3 glibc-2.1.2-11 gcc-2.95.2 binutils-

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