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Re: IDE hdd faster than sata? How come?



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
root@haggis:~# 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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Ron Johnson, Jr.
Jefferson, LA USA
PGP Key ID 8834C06B I prefer encrypted mail.

I like my women like I like my coffee - purchased at above-market
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