Hi all,
I think you look from the wrong side to the matter.SATA is a
bus/protocol and the disk you use on this bus is a standart IDE disk.
The advantage of this protocol is it can make "transfer rate" up to
150MB/s.But the main question is "can your sata disk read/write data up
to 150MB/s?". Next level of SATA disks will perform better speeds and
they will be able to produce I/O near 150MB/s.But now, RPM, platter
densities etc. are nearly same.So it doesnt mean a SATA disk is faster
than an PATA disk (both are IDE disks).Think about:
you have an ISA based 56k modem and a PCI based 56K modem.Which one is
faster? I hope i could tell what i meaned.
Regards
Koray Kusat
Ron Johnson wrote:
On Mon, 2005-10-24 at 22:43 -0200, Bruno Buys wrote:
Ron Johnson wrote:
On Mon, 2005-10-24 at 18:25 -0200, Bruno Buys wrote:
How good is hdparm benchmark for sata? What am I missing here?
frank:/home/bruno# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 2368 MB in 2.00 seconds = 1183.00 MB/sec
Timing buffered disk reads: 170 MB in 3.01 seconds = 56.56 MB/sec
frank:/home/bruno# hdparm -Tt /dev/hda
/dev/hda:
Timing cached reads: 2352 MB in 2.00 seconds = 1176.18 MB/sec
Timing buffered disk reads: 180 MB in 3.03 seconds = 59.47 MB/sec
IDE disk is SAMSUNG SP0802N, FwRev=TK200-04. 80GB. udma5.
Sata is SAMSUNG SP0812C SATA 80GB.
The only thing I found was in samsung website "The drive comes defaulted
to udma100. To enable udma133 refer to www.samsung.com.br". So far,
www.samsung.com.br gives me nothing.
Does anybody have a clue?
Was it a quiet system, with nothing else running at that moment?
I guess. There was no X and DE running. I run hdparm a few times, with
similar results. But since it fails to talk to the sata disk for lots of
other commands, i'm begining to suspect this benchmark feature...
I also tested the jumpers, but they are irrelevant for the sata disk.
On my system, the SATA drive is sightly faster, but that's just it:
slightly. On your system, it's 4.9% slower. Maybe the drivers for
your SATA aren't up to snuff? Maybe that Samsung SATA drive has
ineffcient microcode...
Abit KV-81
IDE - via82cxxx
SATA - sata_via
hda - WD 2500JB-00GVA0 - IDE 250GB
sda - Maxtor 7L300S0 - SATA
# hdparm -Tt /dev/hda
/dev/hda:
Timing cached reads: 2392 MB in 2.00 seconds = 1194.99 MB/sec
Timing buffered disk reads: 174 MB in 3.03 seconds = 57.43 MB/sec
[EMAIL PROTECTED]:~# hdparm -Tt /dev/hda
# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 2408 MB in 2.00 seconds = 1202.98 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 184 MB in 3.01 seconds = 61.12 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
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