Hello, I wrote:
the PIO transfer speeds (very significantly) though I'm not sure of
the current state of affairs...
16bit only performance is identical (as you'd expect)
Well, I don't know what to expect, having seen figures like 0.5 (or
1.5) MB/s cited on this list...
Instead of going to bed, I tried booting FC8 (2.6.23.y) off DVD in
rescue mode and suppressing libata's DMA use: hdparm -t topped at around
1 MB/s from both SATA hard drive and PATA DVD drive with sata_sil driven
the former and pata_atiixp the latter... I wasn't able to compare
results with IDE core of course.
identical with the 32bit pio patches applied
32bit is now
Hm, I didn't realize 32-bit I/O really can really boost the IDE
speed. I vaguely remember (or misremember) benchmarking drives under
DOS (many years ago) with and without 32-bit access enabled in the
BIOS Setup and not seeing any significant differences. Perhpas it's
worth to re-benchmark this in Linux if I find the time...
With hdparm being able to control that via its -c option when using
IDE driver, it shouldn't take much time...
Here's the results I got on my work PC having 2 hard disks on 82801DB,
still running the ancient RH9 (which included hdparm 5.5):
[root@wasted etc]# /sbin/hdparm -i /dev/hda
/dev/hda:
Model=ST380011A, FwRev=3.06, SerialNo=5JV4FZNT
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 2: 1 2 3 4 5 6
[root@wasted etc]# /sbin/hdparm -c /dev/hda
/dev/hda:
IO_support = 0 (default 16-bit)
[root@wasted etc]# /sbin/hdparm -d0 -p4 /dev/hda
/dev/hda:
setting using_dma to 0 (off)
using_dma = 0 (off)
/dev/hda:
attempting to set PIO mode to 4
[root@wasted etc]# /sbin/hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 22.65 seconds = 2.83 MB/sec
[root@wasted etc]# /sbin/hdparm -c1 /dev/hda
/dev/hda:
setting 32-bit IO_support flag to 1
IO_support = 1 (default 32-bit)
[root@wasted etc]# /sbin/hdparm -t /dev/hda
Timing buffered disk reads: 64 MB in 18.19 seconds = 3.52 MB/sec
[root@wasted etc]# /sbin/hdparm -i /dev/hdb
/dev/hdb:
Model=Maxtor 2F030J0, FwRev=VAM51JJ0, SerialNo=F11HZPNE
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=60056543
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: (null): 1 2 3 4 5 6 7
[root@wasted etc]# /sbin/hdparm -c /dev/hdb
/dev/hdb:
IO_support = 0 (default 16-bit)
[root@wasted etc]# /sbin/hdparm -d0 -p4 /dev/hdb
/dev/hdb:
setting using_dma to 0 (off)
using_dma = 0 (off)
/dev/hdb:
attempting to set PIO mode to 4
[root@wasted etc]# /sbin/hdparm -t /dev/hdb
/dev/hdb:
Timing buffered disk reads: 64 MB in 20.80 seconds = 3.08 MB/sec
[root@wasted etc]# /sbin/hdparm -c1 /dev/hdb
/dev/hdb:
setting 32-bit IO_support flag to 1
IO_support = 1 (default 32-bit)
[root@wasted etc]# /sbin/hdparm -t /dev/hdb
Timing buffered disk reads: 64 MB in 12.69 seconds = 5.04 MB/sec
As you can see, although the speed increase can certainly be seen, it's
not really that big for the (cheapo :-) Seagate drive while Maxtor
demonstrated 1.6x increase. I need to try somewhat newer kernel though (don't
want to reboot to CentOS)...
MBR, Sergei
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