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SubjectRe: IDE Harddrive Performance
Date

Well i really cant explain this,

[root@spikes spike]# /sbin/hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 6.65 seconds = 9.62 MB/sec

[root@spikes spike]# cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.29
South Bridge: VIA vt82c586b
Revision: ISA 0x47 IDE 0x6
Highest DMA rate: UDMA33
BM-DMA base: 0xe000
PCI clock: 33MHz
Master Read Cycle IRDY: 1ws
Master Write Cycle IRDY: 1ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes yes
Post Write Buffer: yes no
Enabled: yes yes
Simplex only: no no
Cable Type: 40w 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA PIO UDMA PIO
Address Setup: 30ns 120ns 30ns 120ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 330ns 90ns 330ns
Data Recovery: 30ns 270ns 30ns 270ns
Cycle Time: 60ns 600ns 60ns 600ns
Transfer Rate: 33.0MB/s 3.3MB/s 33.0MB/s 3.3MB/s

[root@spikes spike]# /sbin/hdparm -i /dev/hda

/dev/hda:

Model=FUJITSU MPG3409AT E, FwRev=82B9, SerialNo=VH06T1408HST
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=80063424
IORDY=yes, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5

[root@spikes spike]# /sbin/hdparm /dev/hda

/dev/hda:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4983/255/63, sectors = 80063424, start = 0


Kernel 2.4.16 without patches.
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