Hi !
...all this DMA stuff around linux sounds very interesting
to me.
In my linux (2.4.19, Athlon 600, VIA Chipset) box there is a PLEXTOR
24/10/40. Burning CDs at high speed (24x) gave me "nearly no" system
load. I can compile a kernel in parallel without gettig coasters or
buffer-underruns (prevented ones, of course).
The only thing, which seems to put a high load onto my box is
a run of readcd -c2scan.
I compared the CONFIG settings and the only difference is, that I
inluded ICDECD also. Currently a kernel is backing without that ;O)
Now: A friend of mine bought a LITEON 48x and got BIG problems, even
burning at speeds of 12x or so: Only coasters.
I send him your paarmeter settings...we will see what will happen.
By the way: If I submit a hdparm command to my cdroms hdparm said:
/dev/hdc not supported by hdparm
?
cat /dev/proc/ide/via gave me:
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.34
South Bridge: VIA vt82c686a
Revision: ISA 0x1b IDE 0x6
Highest DMA rate: UDMA66
BM-DMA base: 0xffa0
PCI clock: 33.3MHz
Master Read Cycle IRDY: 0ws
Master Write Cycle IRDY: 0ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes no
Post Write Buffer: yes no
Enabled: yes yes
Simplex only: no no
Cable Type: 80w 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA UDMA UDMA UDMA
Address Setup: 30ns 30ns 30ns 30ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 90ns 90ns 90ns
Data Recovery: 30ns 30ns 30ns 30ns
Cycle Time: 30ns 30ns 60ns 60ns
Transfer Rate: 66.6MB/s 66.6MB/s 33.3MB/s 33.3MB/s
1,0,0 = PLEXTOR CDR/W
1,1,0 = PIONEER CDROM
Kind regards,
Meino Cramer
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