Ram Disk

Ram Disk

[Julia Elbert]

Hi All,

I am running a 7mg ram disk in my 860t. I have multiple programs I start
through linuxrc. I am streaming video, serial data, and running a web server
on various sockets. The webserver is GoAhead. When I click on a cgi script
my system crashes with

Software Emulation Web/62 NIP: 1009a014 *NIP: 0x0 code: ffffffdaSoftware
Emulati
on linuxrc/6 NIP: 1009a014 *NIP: 0x0 code: ffffffdasash-2.03#

Am I running out of ram? I have 16 mgs.

Thanks in advance....
--Julia

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Re: Ram Disk

[Jacob Chen]

Hi,

> Software Emulation Web/62 NIP: 1009a014 *NIP: 0x0 code: ffffffdaSoftware
> Emulati
> on linuxrc/6 NIP: 1009a014 *NIP: 0x0 code: ffffffdasash-2.03#

Can you post how did John show you to fix this problem?  Thanks.

Jacob
----- Original Message -----
From: "Julia Elbert" <jelbert@enerdyne.com>
To: <linuxppc-embedded@lists.linuxppc.org>
Sent: Thursday, August 24, 2000 12:12 PM
Subject: Ram Disk


>
> Hi All,
>
> I am running a 7mg ram disk in my 860t. I have multiple programs I start
> through linuxrc. I am streaming video, serial data, and running a web
server
> on various sockets. The webserver is GoAhead. When I click on a cgi script
> my system crashes with
>
> Software Emulation Web/62 NIP: 1009a014 *NIP: 0x0 code: ffffffdaSoftware
> Emulati
> on linuxrc/6 NIP: 1009a014 *NIP: 0x0 code: ffffffdasash-2.03#
>
> Am I running out of ram? I have 16 mgs.
>
> Thanks in advance....
> --Julia
>


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Re: Ram Disk

[thanh]

HELLO,

Jacob Chen wrote:

> Hi,
>
> > Software Emulation Web/62 NIP: 1009a014 *NIP: 0x0 code: ffffffdaSoftware
> > Emulati
> > on linuxrc/6 NIP: 1009a014 *NIP: 0x0 code: ffffffdasash-2.03#
>
> Can you post how did John show you to fix this problem?  Thanks.
>
> Jacob

CAN YOU POST HOW DID YOU FIX THIS PROBLEM, PLS.
THANKS.
JARI


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RE: Ram Disk

[Julia Elbert]

Hi,
Hi Jari,
Maybe you were talking to Jacob? Hmmm.
I have posted this already. Look at 8/24. But here you go and feel free to
post it again if you like.
Thanks,
Julia

>From John's note my code change was as follows:
I moved a close comment down 5 lines.

lines 405 - 409 commented out in linux/mm/vmscan.c

/* Then, try to page stuff out..
		while (swap_out(priority, gfp_mask)) {
			if (!--count)
				goto done;
		}
*/

John wrote:

In *my* code (I am running a modified 2.2.15 kernel), I merely commented out
the "swap_out ()" code in routine do_try_to_free_pages in mm/vmscan.c (in my
code, it's lines 405-409).  Since I made this change, my system has been
rock-steady (and I run a LOT of applications, including the Apache web
server and various CGI scripts I have written).  I now see free memory go
down as new images are read from the ramdisk, and back up as memory is freed
by the system.
Hope this helps your problem...
John Whitney


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