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Schmolch
l33t
Joined: 16 Jun 2002
Posts: 746
Location: Germany
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 Posted: Thu Feb 24, 2005 3:14 pm Post subject: VIA IDE support is broken, why ... [solved] [moron warning] |
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I have 2 Boards with Via Chipset, a kt133 and a kt600.
I also have a nforce2 board.
I use the same hardware and kernel (2.6.10 with via and nforce chipset support) on all 3 boards (duron 1800, 512MB, AGP-Video) except that the kt133 needs sdram.
On all boards i have the neccessary drivers in my kernel and all devices are properly detected.
On the nforce2 hdparm -t gives me 60MB/s, on the VIAs only <30 MB/s.
There also is a very noticably difference in the sound of the hdd, it sounds much slower.
Some output from the kt600 which im currently on:
| Code: |
sta linux # dmesg | grep VIA
agpgart: Detected VIA KT400/KT400A/KT600 chipset
VP_IDE: VIA vt8237 (rev 00) IDE UDMA133 controller on pci0000:00:0f.0
eth0: VIA Rhine II at 0x1b000, 00:0c:6e:b7:e6:c2, IRQ 10.
hdparm -d /dev/hda
/dev/hda:
using_dma = 1 (on)
hdparm -i /dev/hda
/dev/hda:
Model=ST3200822A, FwRev=3.01, SerialNo=5LJ0YJM9
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 2:
hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 82 MB in 3.04 seconds = 26.97 MB/sec
grep VIA .config
# CONFIG_MVIAC3_2 is not set
CONFIG_BLK_DEV_VIA82CXXX=y
# CONFIG_SCSI_SATA_VIA is not set
CONFIG_VIA_RHINE=m
# CONFIG_VIA_RHINE_MMIO is not set
# CONFIG_VIA_VELOCITY is not set
CONFIG_AGP_VIA=y
# CONFIG_SND_VIA82XX is not set
# CONFIG_SND_VIA82XX_MODEM is not set
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On #gentoo i met one with the same problem and one where it works, searching the forums i found others which similar problems with via ide.
Why does nobody say out loud that the via ide support of the linux kernel does totally suck?
Im not complaining, but we want to know this before we buy the Boards.
[update]
When i switched from the nforce2 board to the kt600, the kt600 would not accept the ide-cable which i used all the time. therefore i picked one of those that came with the board and it was a 40pin cable  |
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GungHo
Apprentice
Joined: 27 Aug 2004
Posts: 254
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| Posted: Thu Feb 24, 2005 8:34 pm Post subject: |
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Hi,
on my KT266A I get around 38MB/sec. Maybe other chipsets perform better.
But, OTOH, what does it matter, thats only the transfer rate from the harddisk cache to the buffercache of Linux. That has nothing to do with real world performance, where the harddisk has cache misses in it's internal cache, and it has to position from track to track. Where latencies in the range of milliseconds occur. If I may say  |
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