linux-kernel - Re: kswapd/tg3 issue

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Date:	Thu, 30 Nov 2006 11:28:04 -0500
From:	Yaroslav Halchenko <yoh@...chology.rutgers.edu>
To:	Avi Kivity <avi@...o.co.il>
Cc:	Alan <alan@...rguk.ukuu.org.uk>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: kswapd/tg3 issue

On another box which has 4 times more RAM or a bit more than twice total
memory, it had twice as high vm.min_free_kbytes
on another node with even more RAM it is 13821..

hm - so what is the algorithm which sets it? percent of available RAM?

For now I am adjusting it on that server to be twice from default.

Thanks everyone for your help

On Thu, 30 Nov 2006, Avi Kivity wrote:

> Alan wrote:
> >Under heavy network or I/O pressure it may not have time to swap to get
> >the memory. Thus adding swap won't usually help. Adding RAM may do but
> >its often not the best answer. Arjan's suggestion should sort it, and -
> >yes typically boxes with very high I/O and network load need more of a
> >pool of memory free for immediate use than other systems.


> It could be nice if the kernel could autotune this, for example by raising the free memory goal when memory shortage is detected, and lowering it 
> gradually when not.

> The sysctl could be a minimum from which this is calculated.
-- 
Yaroslav Halchenko
Research Assistant, Psychology Department, Rutgers-Newark
Student  Ph.D. @ CS Dept. NJIT
Office: (973) 353-5440x263 | FWD: 82823 | Fax: (973) 353-1171
        101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102
WWW:     http://www.linkedin.com/in/yarik        
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