[vdr] Re: Disk performance (was: vdr - some general questions)

["Johannes Schoeller" <schoeller@gmx.at>]

hi list!

how can i know if my system REALLY uses dma ??
while booting i see the following:

ALI15X3: chipset revision 193
ALI15X3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xa800-0xa807, BIOS settings: hda:DMA, hdb:pio
ALI15X3: simplex device:  DMA disabled
ide1: ALI15X3 Bus-Master DMA disabled (BIOS)

when using hdparm /dev/hda it says:

and hdparm -t /dev/hda gives me:

Timing buffered disk reads:  64 MB in  6.02 seconds = 10.63 MB/sec

i think this is not very good for a 80gig ide western digital disk.
it is connected thru the "normal" 40pin ide cable, because my
mabo is only capable of udma-2.

./bonnie++-1.02c/bonnie++ -u 500:100 -s 250 gives me:

Version 1.02c       ------Sequential Output------ --Sequential
Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per
Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
vdr            250M  2691  83 12927  31  7604  30  3076  91 14596  36 112.4
1
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delet
e--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16  1048  88 +++++ +++  1142  89   690  65 +++++ +++   455
39

are the readings ok? what do you think?

thanx,

servus hannes!

> Am Freitag, 26. April 2002 11:47 schrieb Tobias Meyer-Janson:
> > > My System:
> > > Duron 1GHz/256MB/80GB, [...]
> > > Suse 7.3 Pro, only reiser FS, [...]
> > > Elitegroup K7S5A Mainboard with on board
> > >     "Dual PCI IDE interfaces - support four IDE devices
> > >     (PIO mode 4, DMA Mode 2, Ultra DMA 33/66/100)"
> > > 1st Controller: HD, 2nd: DVD-ROM,
> > > [...]
> > > I asked hdparm:
> > >     I/O support =  0 (default 16-bit)
> > >     using_dma   =  1 (on)
> >
> > The HD is a Maxtor 4D080H4 80 GB IDE. I know it's not the fastest but I
> > thought some DVB-Streams would be no problem for any modern HD.
> > How can I check if the HD is the problem? As I mentioned earlier I have
> > also often digital artefacts both in picture and sound.
> >
> > Is it enough to switch DMA on (hdparm says it *is* on) or should I use a
> > special DMA-Mode? I know different HDs and controller have different DMA
> > features - is this configured automatically? I think default should be
> > the fastest possible.
>
> I would _measure_ the disk performance with bonnie or bonnie++
>
>   http://www.coker.com.au/bonnie++/
>
> liquid:/video # bonnie++ -u 500:100 -s 250
> Version  1.01    ------Sequential Output------ --Sequential
Input- --Random-
>                  -Per Chr- --Block-- -Rewrite- -Per
Chr- --Block-- --Seeks--
> Machine     Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
> liquid      250M  8177  76 22123  34 11755  12  8923  85 26080  15 149.3
0
>                  ------Sequential Create------ --------Random
Create--------
>                  -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete
--
>            files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
>               16  7540  86 +++++ +++  8431  89  7414  83 +++++ +++  7092
90
>
> As you can see my system writes 22 MB and reads 26 MB per second. Bonnie++
is
> also able to test operations involving thousands of files in a directory.
> This is useful for people complaining that the "recordings menu" is to
slow.
>
>
> Andi
>
> --
> Web:   http://www.flood-net.de/
> Mail:  flood@flood-net.de
> Phone: +49-(0)-30-680577-44
>
> Windows sucks, Linux rules :-)              http://srom.zgp.org/
> Watch more TV! http://www.cadsoft.de/people/kls/vdr/software.htm
> Who needs DivX?                          telnet blinkenlights.nl
>
>
>
>