war@war:~$ dmesg|grep -i ST[0-9]
hda: ST3120024A, ATA DISK drive
This is a Segeate 120GB 7200RPM drive.
SIS5513: IDE controller on PCI bus 00 dev 15
SIS5513: chipset revision 0
SIS5513: not 100% native mode: will probe irqs later
When I put the drive on a Promise Ultra ATA/133 board, it runs UDMA MODE
5 (ATA 100) just fine.
When I run hdparm -t /dev/hda on the SiS (with the settings I have shown):
root@war:~# hdparm -v /dev/hda
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 14593/255/63, sectors = 234441648, start = 0
root@war:~# hdparm -t /dev/hda
Timing buffered disk reads: 64 MB in 1.60 seconds = 40.00 MB/sec
My question is, how is it possible to get > 33MB/s in only UDMA Mode 2
(the linux driver only supports up to UDMA2).
I haven't been able to figure it out.
With the same settings for the promise, and the promise, ide2=ata100
works on the command line, on the SiS/for the SiS, it does not, says it
is an invalid option, doing that or setting the dma on manually, I get
the same speed (MB/s), but is it really running at ATA/100? I mean, if
it is running in UDMA MODE 5 vs UDMA MODE 2, I would assume a little bit
of a speed boost, I remember with an older box, going from ATA/66 ->
ATA/100 increase about 2-3MB/s throughput with hdparm.
However, more importantly, when I am doing many things simultaenously, I
notice a slowdown, I did *NOT* notice this slow down on my older p3/866
+ ata/66 system, and I knew for a fact it was at ata/66, not only this,
it was a via/133 chipset and the ide[0|1]=ata66 worked as well.
So basically I am wondering if udma mode 5 will be supported for SIS
Secondly, I also have one of those Promise/Serial ATA raid on the
motherboard (2 serial ata/1 ata133), but that is not supported at all.
So what should I do if I want to run at UDMA MODE 5?
Should I buy another promise controller (ATA/133 PCI) and run it off of
Anyone have any suggestions? Please let me know, thank you.
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