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SubjectRe: disk transfer speed problem

On Wed, 27 Feb 2002, Alan Cox wrote:

> Date: Wed, 27 Feb 2002 23:46:42 +0000 (GMT)
> From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> To: lonely wolf <wolfy@pcnet.ro>
> Cc: Mark Hahn <hahn@physics.mcmaster.ca>, linux-kernel@vger.kernel.org
>
> > > > Timing buffered disk reads: 64 MB in 3.24 seconds = 19.75 MB/sec
> > >
> > > well, 109 MB/s is pretty low for buffer-cache reads; this reflects
> > > the relative crippled-ness of your cpu/dram/chipset.
> >
> > well... i would't name a Celeron 900 MHz crippled. PC133 is the best the
> > board gets... and now the speed is lower then the previous server which was
> > an Athlon 600 pluggede in an Asus VIA KX133 based mobo.
>
> I get 25MB/sec off my i815 board. It is pretty starved - I seem stuck at
> about 25MB/sec total even doing hdparm across both controllers.
>
> Using an external video card might make a small difference
> -
on kernel 2.2.20 with andre ata100 patches ported from 2.2.19 to 2.2.20
on asus i815 board.
Kernel 2.4.17 results are similar about 35MB/sec

I got this results, machine is under small workload.

root@MEGANET:~# hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.96 seconds =133.33 MB/sec
Timing buffered disk reads: 64 MB in 1.73 seconds = 36.99 MB/sec

root@MEGANET:~# hdparm -i /dev/hda

/dev/hda:

Model=MAXTOR 6L040J2, FwRev=A93.0500, SerialNo=662131534628
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
BuffType=DualPortCache, BuffSize=1819kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=78177792
IORDY=on/off, tPIO={min:120,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 udma6
AdvancedPM=no
Drive Supports : ATA/ATAPI-5 T13 1321D revision 1 : ATA-1 ATA-2 ATA-3
ATA-4
ATA-5

root@MEGANET:~# hdparm -v /dev/hda

/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4866/255/63, sectors = 78177792, start = 0

other details:

Intel machine check reporting enabled on CPU#0.
128K L2 cache (4 way)
CPU: L2 Cache: 128K
CPU: Intel Pentium III (Coppermine) stepping 0a
Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.35a (19990819) Richard Gooch (rgooch@atnf.csiro.au)
PCI: PCI BIOS revision 2.10 entry at 0xf0e30
PCI: Using configuration type 1
PCI: Probing PCI hardware
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 203M
agpgart: Detected Intel i815 chipset
agpgart: AGP aperture is 32M @ 0xfc000000

Zoran


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