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slow dvd copy on 4.1

From: alemao (alemaosacodelixo.com.br)
Date: Sun Mar 11 2007 - 00:33:28 CST


I'm copying some stuff from a dvd+rw and getting just about 4 MB/s. I can
set/tune something to increase this?
Using another BSD (nbsd/fbsd) i get the normal throughput, about 20 MB/s.

OpenBSD 4.1 (GENERIC) #1434: Thu Mar 8 22:56:57 MST 2007

wd0 at pciide0 channel 0 drive 0: <Maxtor 6Y120L0>
wd0: 16-sector PIO, LBA, 117246MB, 240121728 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6

cd0 at scsibus0 targ 0 lun 0: <HL-DT-ST, DVD-RAM GSA-H20N, 1.01> SCSI0
5/cdrom removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2

Thanks in advance.