Burning a CD image slow down my connection

Burning a CD image slow down my connection

[[A]ndy80]

Hi

If, (for example), I'm downloading a file at 4 k/s and then I start to
burn an image, some files or other thing from my HD to a CD-R, the
connection speed goes to 0,1 or 1 k/s max.

This happen since 2.4.x kernel series.


-- 
 [A]ndy80 - andy80@ptlug.org

GPG Key: http://www.ptlug.org/andy80_key.asc

Re: Burning a CD image slow down my connection

[Alan Cox]

> If, (for example), I'm downloading a file at 4 k/s and then I start to
> burn an image, some files or other thing from my HD to a CD-R, the
> connection speed goes to 0,1 or 1 k/s max.
> 
> This happen since 2.4.x kernel series.

Make sure you have DMA enabled for your IDE cd-rom or ide unmasking enabled
for it (see man hdparm)

Re: Burning a CD image slow down my connection

[[A]ndy80]

Hi

> Make sure you have DMA enabled for your IDE cd-rom or ide unmasking
enabled
> for it (see man hdparm)

these are my settings for my 2 HD:

hdparm -c 1 -d 1 -k 1 /dev/hda
hdparm -c 1 -d 1 -k 1 /dev/hdb

I've my Plextor Writer as secondary master seen as a scsi device and if
I try do use hdparm it says:

[root@piccoli shady]# hdparm -t /dev/cdrom
/dev/cdrom not supported by hdparm

What else ahve I to enable?


--
[A]ndy80 - andy80@ptlug.org

Re: Burning a CD image slow down my connection

[Dr. Michael Weller]

On 25 Sep 2001, [A]ndy80 wrote:

> I've my Plextor Writer as secondary master seen as a scsi device and if
> I try do use hdparm it says:
> 
> [root@piccoli shady]# hdparm -t /dev/cdrom
> /dev/cdrom not supported by hdparm

Hmm, /dev/cdrom would typically be a link. You might try to apply hdparm
to where the link points to, but I cannot really believe hdparm doesn't
follow links.

Normally /dev/cdrom should point to /dev/hdc in your case. I somewhat
suspect that it points to /dev/scd0. If so, can you actually
mount the cdrom? The ide2scsi device emulation basically just passes
scsi commands as atapi commands over the ide bus (since atapi just
use the scsi commands but tunnel them over ide). I'm surprised this also
works for cdroms. I wasn't aware of the fact they are ATAPI and thus
support the scsi command set. Maybe the cdwriters are special in that
context.

Anyway, you'll have to point hdparm to the ide device for your
writer/cdrom.

Michael.

--

Michael Weller: eowmob@exp-math..uni-essen.de, eowmob@ms.exp-math.uni-essen.de,
or even mat42b@spi.power.uni-essen.de. If you encounter an eowmob account on
any machine in the net, it's very likely it's me.

Re: Burning a CD image slow down my connection

[Nicholas Knight]

On Tuesday 25 September 2001 03:21 am, Dr. Michael Weller wrote:
> On 25 Sep 2001, [A]ndy80 wrote:
> > I've my Plextor Writer as secondary master seen as a scsi device
> > and if I try do use hdparm it says:
> >
> > [root@piccoli shady]# hdparm -t /dev/cdrom
> > /dev/cdrom not supported by hdparm
>
> Hmm, /dev/cdrom would typically be a link. You might try to apply
> hdparm to where the link points to, but I cannot really believe
> hdparm doesn't follow links.
>
> Normally /dev/cdrom should point to /dev/hdc in your case. I somewhat
> suspect that it points to /dev/scd0. If so, can you actually
> mount the cdrom? The ide2scsi device emulation basically just passes
> scsi commands as atapi commands over the ide bus (since atapi just
> use the scsi commands but tunnel them over ide). I'm surprised this
> also works for cdroms. I wasn't aware of the fact they are ATAPI and
> thus support the scsi command set. Maybe the cdwriters are special in
> that context.

My DVD-ROM drive and Plextor PlexWriter CD-RW drive both function under 
the idescsi emulation driver. *All* current IDE CD writers are ATAPI 
and REQUIRE idescsi (or in windows, an ASPI layer) in order to be used 
as a cd writer.

Re: Burning a CD image slow down my connection

[Gerold Jury]

Since you use the scsi emulation for your writer you need to use hdparm on 
the original ide device that you passed to the emulation rather than the 
emulated scsi device.
eg use        hdparm -whatever /dev/hdc
     and not hdparm -whatever /dev/scd0 or /dev/cdrom 

On Tuesday 25 September 2001 12:13, [A]ndy80 wrote:
> Hi
> [root@piccoli shady]# hdparm -t /dev/cdrom
> /dev/cdrom not supported by hdparm
>
> What else ahve I to enable?

Re: Burning a CD image slow down my connection

[[A]ndy80]

Hi

> Hmm, /dev/cdrom would typically be a link. You might try to apply hdparm
> to where the link points to, but I cannot really believe hdparm doesn't
> follow links.

yes it's a link to /dev/scd0 and I CAN mount it, because my IDE cdrom is
seen as scsi. In lilo.conf I've this line: append="hdd=ide-scsi
hdc=ide-scsi" (read CD-WRITING HOWTO for more information)

Re: Burning a CD image slow down my connection

[Dr. Michael Weller]

On 25 Sep 2001, [A]ndy80 wrote:

> Hi
> 
> > Hmm, /dev/cdrom would typically be a link. You might try to apply hdparm
> > to where the link points to, but I cannot really believe hdparm doesn't
> > follow links.
> 
> yes it's a link to /dev/scd0 and I CAN mount it, because my IDE cdrom is
> seen as scsi. In lilo.conf I've this line: append="hdd=ide-scsi
> hdc=ide-scsi" (read CD-WRITING HOWTO for more information)

Ok, so you should run hdparm on /dev/hdc in your case (master on second
bus). You can not expect (well, actually, why not?). hdparm to realite
this is no real scsi device and figure out the right ide device to
configure the drive interface accordingly. 

BTW, with regards to your last mesg: I'm well aware you need the ide-scsi
layer and generic scsi devices for ide burners.

However, you can mount /dev/hdc directly for ide cdroms.

So, I was wondering if all (well, most) ide cdroms are atapi and the
kernel cleverly realizes you address a cdrom as /dev/hdc and just uses
those atapi commands and that means, as far as cdroms go, the ide-scsi
part is always embedded in the /dev/hd driver.

OR

if, as I assumed up to now, ide cdroms have a specific CDROM commandset,
maybe just support disk drive style read commands to access the cd data,
such that using ide-scsi and accessing as /dev/scd0 will not always work. 
And if so, ide burners might be special since the are used to be addressed
through an aspi driver anyway. 

Michael.

--

Michael Weller: eowmob@exp-math.uni-essen.de, eowmob@ms.exp-math.uni-essen.de,
or even mat42b@spi.power.uni-essen.de. If you encounter an eowmob account on
any machine in the net, it's very likely it's me.

Re: Burning a CD image slow down my connection

[Nicholas Berry]

>Hi
>
>> Hmm, /dev/cdrom would typically be a link. You might try to apply hdparm
>> to where the link points to, but I cannot really believe hdparm doesn't
>> follow links.
>
>yes it's a link to /dev/scd0 and I CAN mount it, because my IDE cdrom is
>seen as scsi. In lilo.conf I've this line: append="hdd=ide-scsi
>hdc=ide-scsi" (read CD-WRITING HOWTO for more information)

To re-iterate a previous answer, you must run hdparm against '/dev/hdd',  _not_  '/dev/scd0'.

Re: Burning a CD image slow down my connection

[Kurt Garloff]

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On Tue, Sep 25, 2001 at 02:24:54PM +0200, [A]ndy80 wrote:
> Hi
> 
> > Hmm, /dev/cdrom would typically be a link. You might try to apply hdparm
> > to where the link points to, but I cannot really believe hdparm doesn't
> > follow links.
> 
> yes it's a link to /dev/scd0 and I CAN mount it, because my IDE cdrom is
> seen as scsi. In lilo.conf I've this line: append="hdd=ide-scsi
> hdc=ide-scsi" (read CD-WRITING HOWTO for more information)

Try appending ide1=dma to the boot options then. It might break on your
machine, so first try manually.

Regards,
-- 
Kurt Garloff  <garloff@suse.de>                          Eindhoven, NL
GPG key: See mail header, key servers         Linux kernel development
SuSE GmbH, Nuernberg, DE                                SCSI, Security

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Re: Burning a CD image slow down my connection

[Karel Kulhavy]

> Hi
> 

Aren't you connected over a serial port (modem)? I have the same problem,
but not when burning an image, but when dumping long cunks of data from CD
(for example, when studying a content of audio CD). I just see a big packet
loss.

Clock

Re: Burning a CD image slow down my connection

[Kristian Peters]

Karel Kulhavy wrote:

> Aren't you connected over a serial port (modem)? I have the same problem,
> but not when burning an image, but when dumping long cunks of data from CD
> (for example, when studying a content of audio CD). I just see a big packet
> loss.


That's definitely DMA related. I have an old cdwriter that don't understands it 
and so the whole bus is extremely busy during writing. Even my harddisk is very 
slow as well as modem and other things. PCI and ISA cards seem not related. 
(Send packets over tr0 && eth0 without any loss.)

Kristian

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Re: Burning a CD image slow down my connection

[Jacek Popławski]

On Tue, Sep 25, 2001 at 12:13:16PM +0200, [A]ndy80 wrote:
> hdparm -c 1 -d 1 -k 1 /dev/hda

"-u 1" helps here (I am connected to Net by serial port)