Memory problems

Memory problems

[James Courtier-Dutton]

Hi,

Is there anywhere that documents the current problems that Linux is 
having with memory management.
Are there any "big" problems still outstanding, or is it just a matter 
of fixing edge cases now?
The last time I looked into this, people were having memory pressure 
problems relating to network attached swap space. I believe those 
problems are fixed now and I was able to help there.

Kind Regards

James


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(unknown),

[Kirkwood, David A]

Do I need to enable ip-forwarding for a system to function as an ip
router or is this enabled automatically by routed? If I do need to
manually how do I enable it? If not can I disable it though the routed
or do I just use ipchains / iptables?

 

Thanks,

 

David 

Re:

[Tom Callahan]

 From what I remember, the answer is yes.

To manually enable it:
echo "1" > /proc/sys/net/ipv4/ip_forward

or/and add that to /etc/rc.d/rc.local

Thanks,

Tom Callahan
TESSCO Technologies
Desk: (410)-229-1361
Cell: (410)-588-7605
Email: callahant@tessco.com

A real engineer only resorts to documentation when the keyboard dents on the forehead get too noticeable.



Kirkwood, David A wrote:

>Do I need to enable ip-forwarding for a system to function as an ip
>router or is this enabled automatically by routed? If I do need to
>manually how do I enable it? If not can I disable it though the routed
>or do I just use ipchains / iptables?
>
> 
>
>Thanks,
>
> 
>
>David 
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-admin"
>in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>  
>

memory problems

[tom arnall]

my system freezes when I try to run an application that handles a large file 
in a variable. I have set ulimits as follows:

	core file size 		(blocks, -c) 0
	data seg size			(kbytes, -d) unlimited
	file size				(blocks, -f) unlimited
	max locked memory 	(kbytes, -l) 256000
	max memory size		(kbytes, -m) 256000
	open files				(-n) 1024
	pipe size				(512 bytes, -p) 8
	stack size				(kbytes, -s) 8192
	cpu time 				(seconds, -t) unlimited
	max user processes	(-u) unlimited
	virtual memory 		(kbytes, -v) unlimited


Physical memory on the system is 512MB, yet when the application runs - 
despite the limits shown above - linux hands almost all of memory to the 
application.

Tom Arnall
north spit, ca

Re: Memory problems

[Ralf Baechle]

On Mon, May 03, 1999 at 12:40:11PM +0200, Rik van Riel wrote:

> > Would it help to do all non-DMA allocations from memory above the 16M
> > mark if possible, and only allocate them lower than that if there was
> > no memory above that mark available?
> 
> Some time ago I wrote a quick and dirty design for a zone
> allocator. I guess now is the time to dust off the design
> (http://www.nl.linux.org/~riel/zone-alloc.html) and think
> up a good allocator for 2.3 and  beyond.

Here is another requirement for a future allocator - it should be ccNUMA
aware, that is it should try to allocate pages as close to the local node
as possible.

That one may be fun ...

  Ralf

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