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SubjectPoor IDE performance with VIA MVP3
I have a VIA MVP3 (VT82C586B) controller on my motherboard, and am
experiencing extremely poor performance with a Maxtor 20G
(52049U4) drive. It is an UDMA66-capable drive, but I'm only attempting
to use UDMA33 (with an 80-pin cable, as recommended).

The drive is detected and works just fine, with no errors reported,
however the acces is painfully slow. hdparm -t varries from 970 K/sec to
2.5 M/sec. (See below)

The drive is attached by itself to the first IDE channel. On the second I
have a Maxtor 6.8G (90680D4) and a CDROM. hdparm -t on the second drive
typically gives 8-9 M/sec. I manually set this drive with hdparm -X34
(mdma2), otherwise it generates errors.

I have tried Linux 2.2.19, 2.4.12, and now 2.4.13, and all exhibit this
same behavior. I was originally running with a 40-pin cable, and switched
it to the 80 to see if it might help, but it had no effect. As some
background information, I was originally running linux off of the second
6G drive, and opted to move it onto the 20G because it got better
performance. Once I did this, however, the drive started performing
slowly like this, regardless of whether I'm booting to it or the 6G

Does this sound like it's just a hardware problem? Has anyone experienced
anything similar to this? Any advice would be greatly apreciated.

Ryan Hayle
Please CC replies...

Some relevent bits of info below...

>From dmesg:
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with
VP_IDE: VIA vt82c586b (rev 47) IDE UDMA33 controller on pci00:07.1
ide0: BM-DMA at 0xe000-0xe007, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xe008-0xe00f, BIOS settings: hdc:DMA, hdd:DMA
hda: Maxtor 52049U4, ATA DISK drive
hdc: Maxtor 90680D4, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 40020624 sectors (20491 MB) w/2048KiB Cache, CHS=2491/255/63,
hdc: 13281408 sectors (6800 MB) w/256KiB Cache, CHS=13176/16/63, UDMA(33)
Partition check:
/dev/ide/host0/bus0/target0/lun0: p1 p2 p3
/dev/ide/host0/bus1/target0/lun0: p1 p2 p3

hdparm -it /dev/hda /dev/hdc


Model=Maxtor 52049U4, FwRev=DA6207V0, SerialNo=K40GTYJC
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=40020624
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4
Timing buffered disk reads: 64 MB in 45.08 seconds = 1.42 MB/sec


Model=Maxtor 90680D4, FwRev=PAS23B15, SerialNo=V40667NA
Config={ Fixed }
RawCHS=13176/16/63, TrkSize=0, SectSize=0, ECCbytes=29
BuffType=DualPortCache, BuffSize=256kB, MaxMultSect=16, MultSect=16
CurCHS=13176/16/63, CurSects=13281408, LBA=yes, LBAsects=13281408
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 *mdma2 udma0 udma1 udma2
Timing buffered disk reads: 64 MB in 7.37 seconds = 8.68 MB/sec

----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.29
South Bridge: VIA vt82c586b
Revision: ISA 0x47 IDE 0x6
Highest DMA rate: UDMA33
BM-DMA base: 0xe000
PCI clock: 33MHz
Master Read Cycle IRDY: 1ws
Master Write Cycle IRDY: 1ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: no no
Post Write Buffer: no no
Enabled: yes yes
Simplex only: no no
Cable Type: 40w 40w
Transfer Mode: UDMA DMA DMA DMA
Address Setup: 30ns 120ns 30ns 120ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 330ns 90ns 330ns
Data Recovery: 30ns 270ns 30ns 270ns
Cycle Time: 60ns 600ns 120ns 600ns
Transfer Rate: 33.0MB/s 3.3MB/s 16.5MB/s 3.3MB/s

PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies, Inc. VT82C597 [Apollo VP3] (rev 4).
Master Capable. Latency=16.
Prefetchable 32 bit memory at 0xe0000000 [0xe3ffffff].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x AGP] (rev 0).
Master Capable. No bursts. Min Gnt=4.
Bus 0, device 7, function 0:
ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA [Apollo VP] (rev 71).
Bus 0, device 7, function 1:
IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 6).
Master Capable. Latency=64.
I/O at 0xe000 [0xe00f].
Bus 0, device 7, function 3:
Host bridge: VIA Technologies, Inc. VT82C586B ACPI (rev 16).
IRQ 9.
Bus 0, device 8, function 0:
VGA compatible controller: nVidia Corporation Riva TnT 128 [NV04] (rev 3).
IRQ 11.
Master Capable. Latency=248. Min Gnt=5.Max Lat=1.
Non-prefetchable 32 bit memory at 0xe4000000 [0xe4ffffff].
Prefetchable 32 bit memory at 0xe5000000 [0xe5ffffff].
Bus 0, device 9, function 0:
Multimedia video controller: Brooktree Corporation Bt848 TV with DMA push (rev 17).
IRQ 10.
Master Capable. Latency=64. Min Gnt=16.Max Lat=40.
Prefetchable 32 bit memory at 0xe8001000 [0xe8001fff].
Bus 0, device 11, function 0:
Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 0).
IRQ 5.
Master Capable. Latency=64. Min Gnt=10.Max Lat=10.
I/O at 0xe800 [0xe87f].
Non-prefetchable 32 bit memory at 0xe8000000 [0xe800007f].

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