Subject: devel-digest V2 #216
From: [email-masked] (devel-digest)
To: [email-masked]

devel-digest          Thursday, July 8 1999          Volume 02 : Number 216

In this issue:

    Re: memory bandwidth problems
    Re: 'marginal timeout'
    Re: memory bandwidth problems
    Re: 'marginal timeout'

See the end of this digest for information about devel-digest.

----------------------------------------------------------------------

Date: Wed, 07 Jul 1999 21:36:56 -0400
From: Mark Lord <[email-masked]>
Subject: Re: memory bandwidth problems

"Andrew E. Mileski" wrote:
> Try some optimization on the program you posted.
> 
>   with no opt:
>       132130000/1351680000 about  9.75 MB/sec
>   with -O2 -fsigned-char -fomit-frame-pointer:
>      44660000/1351680000 about 28.86 MB/sec
>   with -O2 -fsigned-char -fomit-frame-pointer -funroll-loops
>      30349000/1351680000 about 42.47 MB/sec

On a similar vein:

	[root@windy /root]# hdparm -T /dev/hda

	/dev/hda:
	 Timing buffer-cache reads:   64 MB in  1.23 seconds =52.03 MB/sec

Compare that with a P2-400/SDRAM system:
	Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec

- -- 
[email-masked]

- ---
This message processed by the Netwinder.Org news2mail gateway.

- --
This list is run automagically by Majordomo 1.94.4
Please send email questions to [email-masked]
To UNSUBSCRIBE: email [email-masked] with
"unsubscribe devel" as the body of your message.

------------------------------

Date: Wed, 07 Jul 1999 21:50:43 -0400
From: Mark Lord <[email-masked]>
Subject: Re: 'marginal timeout'

"B. Darryl DeGraff" wrote:
> 
> We have a new NetWinder and are perparing to configure it to our
> specifications.  Twice we got this message, once when changing settings
> in NeTTrom, once when entering a command at the command line:
>     hda: marginal timeout
> 
> Any ideas?

I put it there.  The associated comment (from me) says:

	/* drive must have responded just as the timer expired */

A very unlikely situation.. but maybe it happens.

The message has already been removed from the 2.1.xx and 2.2.xx and 2.3.xx kernels.
- -- 
[email-masked]

- ---
This message processed by the Netwinder.Org news2mail gateway.

- --
This list is run automagically by Majordomo 1.94.4
Please send email questions to [email-masked]
To UNSUBSCRIBE: email [email-masked] with
"unsubscribe devel" as the body of your message.

------------------------------

Date: Wed, 07 Jul 1999 21:58:33 -0400
From: "Andrew E. Mileski" <[email-masked]>
Subject: Re: memory bandwidth problems

Mark Lord wrote:
> On a similar vein:
> 
>         [root@windy /root]# hdparm -T /dev/hda
> 
>         /dev/hda:
>          Timing buffer-cache reads:   64 MB in  1.23 seconds =52.03 MB/sec
> 
> Compare that with a P2-400/SDRAM system:
>         Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec

Try that in PIO mode.

- --
Andrew E. Mileski - Software Engineer
Rebel.com  http://www.rebel.com/

- ---
This message processed by the Netwinder.Org news2mail gateway.

- --
This list is run automagically by Majordomo 1.94.4
Please send email questions to [email-masked]
To UNSUBSCRIBE: email [email-masked] with
"unsubscribe devel" as the body of your message.

------------------------------

Date: Wed, 07 Jul 1999 22:00:44 -0400
From: "Andrew E. Mileski" <[email-masked]>
Subject: Re: 'marginal timeout'

Mark Lord wrote:
>         /* drive must have responded just as the timer expired */
> 
> A very unlikely situation.. but maybe it happens.
> 
> The message has already been removed from the 2.1.xx and 2.2.xx and 2.3.xx kernels.

The drive controller sits on the ISA bus, so reponse to interrupts is slow.

- --
Andrew E. Mileski - Software Engineer
Rebel.com  http://www.rebel.com/

- ---
This message processed by the Netwinder.Org news2mail gateway.

- --
This list is run automagically by Majordomo 1.94.4
Please send email questions to [email-masked]
To UNSUBSCRIBE: email [email-masked] with
"unsubscribe devel" as the body of your message.

------------------------------

End of devel-digest V2 #216
***************************

--
This list is run automagically by Majordomo 1.94.4
Please send email questions to [email-masked]
To UNSUBSCRIBE: email [email-masked] with
"unsubscribe devel-digest" as the body of your message.