Messages in this thread | | | Date | Sat, 22 Mar 2003 06:52:46 -0500 | From | Justin Piszcz <> | Subject | Question about hdparm & dma. |
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root@war:~# hdparm -X69 /dev/hda /dev/hda: setting xfermode to 69 (UltraDMA mode5) root@war:~# dmesg | tail -n 1 ide0: Speed warnings UDMA 3/4/5 is not functional. root@war:~#
war@war:~$ dmesg|grep -i ST[0-9] hda: ST3120024A, ATA DISK drive war@war:~$
This is a Segeate 120GB 7200RPM drive. On a:
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.
Next...
When I run hdparm -t /dev/hda on the SiS (with the settings I have shown):
root@war:~# hdparm -v /dev/hda
/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:~#
root@war:~# hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 64 MB in 1.60 seconds = 40.00 MB/sec
Now...
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 chipsets. 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 that?
Anyone have any suggestions? Please let me know, thank you. Please cc me as I am not on the list.
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