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jesnow
l33t
Joined: 26 Apr 2006
Posts: 895
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 Posted: Sat Jan 31, 2009 12:57 pm Post subject: Disable 80-wire check for CF card drive. |
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I bought a CF card drive to use in my future HTPC client. It plugs directly into the IDE port, and has no cable. It's a 233x card, and so if 1x is 150K (I assume? the speed of an original CD-ROM for some reason), then we should get 35MB/s performance. And it's silent and has ~zero seek time.
BUT something goes wrong during boot:
| Code: |
Jan 19 20:30:41 Lemond hda: CF CARD, ATA DISK drive
Jan 19 20:30:41 Lemond hda: host max PIO5 wanted PIO255(auto-tune) selected PIO2
Jan 19 20:30:41 Lemond hda: host side 80-wire cable detection failed, limiting max speed to UDMA33
Jan 19 20:30:41 Lemond hda: UDMA/33 mode selected
Jan 19 20:30:41 Lemond hda: max request size: 128KiB
Jan 19 20:30:41 Lemond hda: 7831152 sectors (4009 MB) w/1KiB Cache, CHS=7769/16/63
Jan 19 20:30:41 Lemond hda: hda1 hda2
Jan 19 20:30:41 Lemond EXT3-fs: hda2: orphan cleanup on readonly fs
Jan 19 20:30:41 Lemond EXT3-fs: hda2: 15 orphan inodes deleted
Jan 19 20:30:41 Lemond EXT3 FS on hda2, internal journal
Jan 19 20:30:41 Lemond Adding 528152k swap on /dev/hda1. Priority:-1 extents:1 across:528152k
Jan 19 20:30:41 Lemond hda: UDMA/33 mode selected
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DAMN! This really slows me down.
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Lemond jesnow # hdparm -i /dev/hda
/dev/hda:
Model=CF CARD, FwRev=20080820, SerialNo=20081225 012349A4
Config={ HardSect NotMFM Fixed DTR>10Mbs }
RawCHS=7769/16/63, TrkSize=0, SectSize=576, ECCbytes=4
BuffType=DualPort, BuffSize=1kB, MaxMultSect=1, MultSect=off
CurCHS=7769/16/63, CurSects=7831152, LBA=yes, LBAsects=7831152
IORDY=no, tPIO={min:120,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 udma6
AdvancedPM=yes: disabled (255)
Drive conforms to: Unspecified: ATA/ATAPI-4
* signifies the current active mode
Lemond jesnow # hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 264 MB in 2.00 seconds = 131.99 MB/sec
Timing buffered disk reads: 70 MB in 3.04 seconds = 23.06 MB/sec
Lemond jesnow #
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So I did a simple hack on /home/src/linux-2.6.28-gentoo-r1/drivers/ide/ide-iops.c to bypass that check:
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no_80w:
// Warn but don't do anything.
//if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
// return 0;
printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
"NOT limiting max speed to UDMA33 -- JES hack!!\n",
drive->name,
hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
//
// drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;
return 1; // This was return 0;
}
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Now when I boot I get:
| Code: |
Jan 29 09:08:34 Lemond hda: CF CARD, ATA DISK drive
Jan 29 09:08:34 Lemond hda: host max PIO5 wanted PIO255(auto-tune) selected PIO2
Jan 29 09:08:34 Lemond hda: host side 80-wire cable detection failed, NOT limiting max speed to UDMA33 -- JES hack!!
Jan 29 09:08:34 Lemond hda: UDMA/133 mode selected
Jan 29 09:08:34 Lemond hda: max request size: 128KiB
Jan 29 09:08:34 Lemond hda: 7831152 sectors (4009 MB) w/1KiB Cache, CHS=7769/16/63
Jan 29 09:08:34 Lemond hda: hda1 hda2
Jan 29 09:08:34 Lemond EXT3 FS on hda2, internal journal
Jan 29 09:08:34 Lemond Adding 528152k swap on /dev/hda1. Priority:-1 extents:1 across:528152k
Jan 29 09:08:34 Lemond hda: host side 80-wire cable detection failed, NOT limiting max speed to UDMA33 -- JES hack!!
Jan 29 09:08:34 Lemond hda: UDMA/133 mode selected
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and
| Code: |
Lemond jesnow # hdparm -i /dev/hda
/dev/hda:
Model=CF CARD, FwRev=20080820, SerialNo=20081225 012349A4
Config={ HardSect NotMFM Fixed DTR>10Mbs }
RawCHS=7769/16/63, TrkSize=0, SectSize=576, ECCbytes=4
BuffType=DualPort, BuffSize=1kB, MaxMultSect=1, MultSect=off
CurCHS=7769/16/63, CurSects=7831152, LBA=yes, LBAsects=7831152
IORDY=no, tPIO={min:120,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 *udma6
AdvancedPM=yes: disabled (255)
Drive conforms to: Unspecified: ATA/ATAPI-4
* signifies the current active mode
Lemond jesnow # hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 268 MB in 2.00 seconds = 133.83 MB/sec
Timing buffered disk reads: 108 MB in 3.03 seconds = 35.64 MB/sec
Lemond jesnow #
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That machine has been up and running stably ever since, no disk issues.
I love linux. |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54823
Location: 56N 3W
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| Posted: Sat Jan 31, 2009 2:19 pm Post subject: |
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jesnow,
Do not use a journalled filesystem on a FLASH drive. The extra writes to the journal make a difference to the media life and the spead of writes too.
Some laptops have the same issue. They use very short 40 wire cables and use the same work around
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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jesnow
l33t
Joined: 26 Apr 2006
Posts: 895
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| Posted: Sat Jan 31, 2009 2:46 pm Post subject: |
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| The cf card was not expensive, and I expect I'll buy a newer/faster one long before it wears out. If it *does* wear out, I'll certianly take steps, but for now, I'm just going to blithely see what happens. |
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