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Old 10-02-2004, 02:29 AM   #1
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Registered: May 2004
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harddisk read speed is too slow

My box is Debian sid
kernel 2.6.7

I compiled the kernel 2.6.7 and i work well, but today i boot my computer, it took a long time to boot up.

Here is the test results of the harddisk.
#hdparm -v /dev/hda
multcount = 0 (off)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 65535/16/63, sectors = 40020664320, start = 0

#hdparm -tT /dev/hda
Timing cached reads: 408 MB in 2.02 seconds = 202.41 MB/sec
Timing buffered disk reads: 4 MB in 4.87 seconds = 841.89 kB/sec

#hdparm -i /dev/hda

Model=ST340810A, FwRev=3.39, SerialNo=3FB25C2X
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=off
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=78165360
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=yes: unknown setting WriteCache=enabled
Drive conforms to: device does not report version:

* signifies the current active mode

So i come back to the old kernel 2.4.18
here is the results under kernel2.4.18
#hdparm -v /dev/hda
multcount = 0 (off)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4865/255/63, sectors = 40020664320, start = 0

#hdparm -tT /dev/hda
Timing cached reads: 1008 MB in 2.00 seconds = 504.00 MB/sec
Timing buffered disk reads: 82 MB in 3.00 seconds = 27.33 MB/sec

The kernel 2.6.7 is compiled by myself and work fine for a long time.

How can I solve the problem?


Last edited by halcyon; 10-02-2004 at 02:31 AM.
Old 10-02-2004, 05:38 AM   #2
Registered: Aug 2003
Location: Dunedin NZ
Distribution: Mint 13 Cinnamon
Posts: 653

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You can try adding the flags -m16 and -c3 to the hdparm command. Just man hdparm to see what these options actually do. It's a bit long-winded to explain fully, but it basically enables multiple sector mode and 32-bit I/O support.

Old 10-02-2004, 05:06 PM   #3
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Registered: Jan 2002
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The option -c3 enables 32 bit I/O with sync. You may want to turn on unmaskirq. What it will do is make the computer do other jobs while the hard drive is finding the file. Though not all drives work well with multicount and read-ahead, so you have to experiment.
Old 10-03-2004, 01:33 AM   #4
LQ Newbie
Registered: Oct 2004
Location: Ankara
Distribution: Debian Unstable
Posts: 4

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Hey Halcyon
Are you sure you enabled specific support for your ide-chipset at kernel compilation?
This is what I can think of, when you mentioned the difference between previous- and your custom kernel.

Emrah Unal
Old 10-05-2004, 09:26 AM   #5
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Registered: May 2004
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I have tried all the method mentioned above. But it has no effects.
My computer's hardware:

Mainboard: ECS K7S5A
CPU: Athlon XP1600+
Harddisk: Segate ST340810A & WDC WD300BB-32CCBO

Segate is the master of the first channel and the WD is the slave. GCE is the master of the second channel.

The kernel that i compiled worked well. The reading speed was in a normal state, and it is about 27M/s.

This problem was suddenly happened.
I found that if I close the 'ACPI aware OS' in the BIOS, the reading speed under kernel 2.6 is good. But after I set this, the other system on my computer, Windows, couldn't boot up, it just reboot again and again.

Any advice will be thankful.



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