Re: 7200 RPM udma33 same speed as 5400 PIO mode 4
On Thu, 10 Feb 2000 dan@cg619985-a.adubn1.nj.home.com wrote:
> On Thu, Feb 10, 2000 at 08:40:29AM -0700, Rick Macdonald generated a stream of 1s and 0s:
> >
> > I added a Maxtor 27GB 7200rpm ATA66 drive to my P200MMX when I upgraded to
> > potatos and kernel 2.2.14.
> >
> > My motherboard (ASUS TX97-E) only supports udma mode 2 (33MB/sec), but I
> > find that this drive and my old WD 4GB (no UDMA) both show the same speed
> > of about 9.4MB/sec with hdparm -t. Even if the new drive is the only drive
> > on the primary IDE interface.
> You can't expect any improvents unless you turn multcount to 16 or to
> whatever your drive supports, and switch I/O into 32bit mode. Just with
> those two turned on, my WD goes from 6 to 12 MB/s without using DMA.
> Also I recommend setting unmaskirq to on, because that frees up your CPU
> when it does disk transfer; the multcount setting saves you the number
> of interrupts per transfer the size of this setting (i.e. 1 interrupt per 16 blocks instead of 16 interrupts per 16 blocks) that you set it to, so it's very important, so is 32 bit transfer mode. The 16 bit mode is really an archaic setting
> dating back to early Pentium and 486 machines, this issue really needs
> to be addressed on distribution level, since most people don't bother
> playing with hdparm at all, they're always SLOW. What's ironic, is you
> can configure your kernel to enable DMA, but can't enable 32 bit I/O.
Sheesh! That sounded so good, but as shown below, those settings made no
difference. I tried again with just the one drive on the rimary IDE (no
slave). I tried -X34 too, but it hung the machine. Fortunately, no damage
was done when I hit the reset switch.
Any other ideas? Could I be missing kernel config options, or would hdparm
know that and not set the values?
timshel# hdparm -m16 -c1 -u1 -i -v /dev/hda
/dev/hda:
setting 32-bit I/O support flag to 1
setting multcount to 16
setting unmaskirq to 1 (on)
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 3322/255/63, sectors = 53369568, start = 0
Model=Maxtor 92732U8, FwRev=RA530JN0, SerialNo=H8059G4C
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=16
DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=53369568
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
UDMA modes: mode0 mode1 *mode2 mode3 mode4
timshel# hdparm -t /dev/hda;hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 6.99 seconds = 9.16 MB/sec
/dev/hda:
Timing buffered disk reads: 64 MB in 6.77 seconds = 9.45 MB/sec
You have mail in /var/spool/mail/rickm
timshel# hdparm -m0 -c0 -u0 -i -v /dev/hda
/dev/hda:
setting 32-bit I/O support flag to 0
setting multcount to 0
setting unmaskirq to 0 (off)
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 3322/255/63, sectors = 53369568, start = 0
Model=Maxtor 92732U8, FwRev=RA530JN0, SerialNo=H8059G4C
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=off
DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=53369568
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
UDMA modes: mode0 mode1 *mode2 mode3 mode4
timshel# hdparm -t /dev/hda;hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 6.90 seconds = 9.28 MB/sec
/dev/hda:
Timing buffered disk reads: 64 MB in 6.93 seconds = 9.24 MB/sec
...RickM...
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