Bug 229968 - pata_via: different DMA for ident. disks on the same port
pata_via: different DMA for ident. disks on the same port
Status: CLOSED UPSTREAM
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
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i386 Linux
medium Severity medium
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Assigned To: Alan Cox
Brian Brock
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Depends On:
Blocks:
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Reported: 2007-02-24 23:29 EST by Ronald Warsow
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2007-03-21 11:50:57 EDT
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Description Ronald Warsow 2007-02-24 23:29:53 EST
Description of problem:
i see different DMA's for 2 ident. disks on the same cable/ide-/ata- port

Version-Release number of selected component (if applicable):
2.6.20-1.2942.fc7

How reproducible:
(re-) boot

Steps to Reproduce:
1.
2.
3.
  
Actual results:
diff. dma

Expected results:
both disk with udma5

Additional info:
...
SCSI subsystem initialized
libata version 2.10 loaded.
pata_via 0000:00:0f.1: version 0.2.1
ACPI: PCI Interrupt 0000:00:0f.1[A] -> GSI 20 (level, low) -> IRQ 17
ata1: PATA max UDMA/133 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001fc00 irq 14
ata2: PATA max UDMA/133 cmd 0x00010170 ctl 0x00010376 bmdma 0x0001fc08 irq 15
scsi0 : pata_via
ata1.00: ATA-7: SAMSUNG SP0411N, TW100-11, max UDMA/100
ata1.00: 78242976 sectors, multi 16: LBA48 
ata1.01: ATA-7: SAMSUNG SP0411N, TW100-11, max UDMA/100
ata1.01: 78242976 sectors, multi 16: LBA48 
ata1.00: configured for UDMA/33
ata1.01: configured for UDMA/100


/dev/sda:

 Model=SAMSUNG SP0411N        , FwRev=TW100-11, SerialNo=S01JJ50Y167743      
...
 UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 udma3 udma4 udma5 
...

/dev/sdb:

 Model=SAMSUNG SP0411N        , FwRev=TW100-11, SerialNo=S01JJ10Y268137      
...
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma3 udma4 *udma5 
...

hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   1178 MB in  2.00 seconds = 589.42 MB/sec
 Timing buffered disk reads:   84 MB in  3.06 seconds =  27.41 MB/sec

hdparm -tT /dev/sdb

/dev/sdb:
 Timing cached reads:   1148 MB in  2.00 seconds = 574.19 MB/sec
 Timing buffered disk reads:  152 MB in  3.02 seconds =  50.31 MB/sec

>:|
Comment 1 Alan Cox 2007-03-07 14:47:50 EST
Known bug - cable detection problem - patch submitted upstream
Comment 2 Alan Cox 2007-03-21 11:50:57 EDT
Fixed upstream
Comment 3 Ronald Warsow 2007-06-02 05:38:39 EDT
to complete/extend this:

last the days a bought a new sata drive from samsung. this time in the box was a
description, turns out: SAMSUNG SP0411N drives are configured to run at 100
default. to run 133 you need to configure them via a software util. .

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