slow disk reads: Slackware 10 kernel 2.6.7

nirvanix · 06-28-2004, 03:21 PM

Is anyone else getting slow hard disk reads after installing Slackware 10 with kernel 2.6.7? hdparm shows that I do have dma enabled on the drive (udma6), but it confirms what I experienced - a disk transfer rate of about 3Mb/s! On Slackware 9.1 with kernel 2.4.24 I was getting close to 50Mb/s...

rotvogel · 06-28-2004, 03:39 PM

Same kernel version, same Slackware version, different speeds. I have about 35 MB/sec which is about the same using Slack 9.1 / kernel 2.4.x . I use a custom compiled kernel.

nirvanix · 06-29-2004, 12:51 AM

thanks for the info red eagle!

XPediTioN · 06-29-2004, 10:49 AM

bash-2.05b# hdparm -i /dev/hda

/dev/hda:

Model=SAMSUNG SV8004H, FwRev=QR100-07, SerialNo=0429J1FRB15155
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=38997, SectSize=619, ECCbytes=4
BuffType=DualPortCache, BuffSize=1945kB, MaxMultSect=16, MultSect=16
CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=156368016
IORDY=yes, 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
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 1:

* signifies the current active mode

How do I know if it's using dma?? Is it? How do I check the speed?

keefaz · 06-29-2004, 10:56 AM

hdparm -t /dev/hda

XPediTioN · 06-29-2004, 11:08 AM

bash-2.05b# hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 96 MB in 3.02 seconds = 31.75 MB/sec
bash-2.05b#

Why is it so slow?

init · 06-29-2004, 11:17 AM

2.6.7 kernel is messed up

I cant enable dma or anything my drive is such a bottel neck it is not even funny.

Code:

/dev/hda:
 multcount    =  0 (off)
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 65535/16/63, sectors = 156355584, start = 0

Code:

 hdparm -d1 /dev/hda

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

I have posted in other places on this board but no one has any ideas on this yet, I am bumed out.

*edit* WOW!!

Code:

/dev/hda:
 Timing buffered disk reads:   12 MB in  3.11 seconds =   3.86 MB/sec

and you thought yours was bad

keefaz · 06-29-2004, 11:26 AM

I would check the bios config to see if features enabled or not.

Quote:

Timing buffered disk reads: 96 MB in 3.02 seconds = 31.75 MB/sec
bash-2.05b#

Why is it so slow?

Quit your programs, exit X and redo the test