So there isn't any problem is it?
I saw this thing because of a system that seems to be
slower and with more hd access so i assumed the
message
ide: Assuming 33MHz system bus speed for PIO modes;
override with idebus=xx
as something wrong on my system.
--- James Sparenberg [EMAIL PROTECTED] wrote:
On Mon, 2003-11-17 at 13:12, Angelo Naselli wrote:
Any idea? why 16 bit ?
[EMAIL PROTECTED] angelo]# /sbin/hdparm -v /dev/hda
/dev/hda:
multcount= 16 (on)
This is what I think you are refering to. from the
man page.
-m Get/set sector count for multiple sector
I/O on the drive.
A setting of 0 disables this feature. Multiple
sector mode
(aka IDE Block Mode), is a feature of most
modern IDE hard
drives, permitting the transfer of multiple sectors
per I/O
interrupt, rather than the usual one sector per
interrupt.
When this feature is enabled, it typically reduces
operating
system overhead for disk I/O by 30-50%. On
many
systems, it also provides increased data throughput
of
anywhere from 5% to 50%. Some drives, however
(most
notably the WD Caviar series), seem to run slower
with multiple mode
enabled. Your mileage may vary. Most
drives support the minimum settings of 2, 4,
8, or 16
(sectors). Larger settings may also be possible,
depending
on the drive. A setting of 16 or 32 seems optimal
on many systems.
Western Digital recommends lower settings of 4 to
8 on many of their drives, due tiny (32kB)
drive buffers
and non-optimized buffering algorithms. The -i
flag can be
used to find the maximum setting supported by
an installed
drive (look for MaxMultSect in the output). Some
drives claim
to support multiple mode, but lose data at
some
settings. Under rare circumstances, such failures
can result
in massive filesystem corruption.
The 16 bit setting is a least common denominator. A
good number of
drives out there either can't do or if they do, have
no gain going to 32
bit. 32 bit also increases the chance of data
corruption on drives that
are dicey. So MDK and others pic the method least
likely to cause
problems. 16bit.
James
IO_support = 0 (default 16-bit)
unmaskirq= 0 (off)
using_dma= 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead= 8 (on)
geometry = 9964/255/63, sectors = 160086528,
start = 0
[EMAIL PROTECTED] angelo]# dmesg
[...]
Serial driver version 5.05c (2001-07-08) with
HUB-6 MANY_PORTS MULTIPORT
SHARE_I
RQ SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
RAMDISK driver initialized: 16 RAM disks of 32000K
size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision:
7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO
modes; override with idebus=xx
SIS5513: IDE controller at PCI slot 00:02.5
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs
later
SIS5513: SiS735 ATA 100 (2nd gen) controller
ide0: BM-DMA at 0xff00-0xff07, BIOS settings:
hda:DMA, hdb:DMA
ide1: BM-DMA at 0xff08-0xff0f, BIOS settings:
hdc:DMA, hdd:DMA
hda: Maxtor 6Y080L0, ATA DISK drive
blk: queue c0181bc0, I/O limit 4095Mb (mask
0x)
hdc: SAMSUNG DVD-ROM SD-616Q, ATAPI CD/DVD-ROM
drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: attached ide-disk driver.
hda: host protected area = 1
hda: 160086528 sectors (81964 MB) w/2048KiB Cache,
CHS=9964/255/63, UDMA(33)
Partition check:
/dev/ide/host0/bus0/target0/lun0: p1 p2 p5 p6
p7
[...]
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