Sorry for the repost. It seems that when I tried to attach the kernel
data as an attached file the text of my mail message got clipped.
Many of you may have already seen this data, sorry for the repost, but
I was concerned that perhaps not all of my original email made it through.
Hopefully
Hi All,
This problem is close to my heart too.
On the Blackfin systems we have been working on slobs, slabs and even
(piece of)cake allocators inside the ever dynamic 2.6 kernel.
We were, I think close to a solution but I for one am having trouble
keeping any solution in line with kernel
David McCullough wrote:
If you boot te hsystem is a configuration that doesn't use much RAM and
don't start and nasty big apps is the system idle (ie kswapd is
behaving). If so what triggers it's rampage ?
Cheers,
Davidm
Davidm,
This came out a bit garbled. I'm going to paraphrase and hope
Aristotelis Iordanidis wrote:
We've run into the same problem, working with an armnommu platform.
We tracked down the root of the high cpu load to the function
kswapd_balance_pgdat() in linux-2.4.x/mmnommu/vmscan.c.
The problem occurs only when using the non-power-of-2 memory allocator
We've configured in the more frugal page_alloc2() allocator and have noticed
that the CPU time of kswapd has jumped considerably.
A typical ps now shows something like this:
/ ps
PID PORT STAT SIZE SHARED %CPU COMMAND
1 S 94K 0K 0.0 /bin/init
2 S 0K 0K
I forgot to add the obligatory:
uclinux-2.4.32-uc0 from the 20060803 drop.
Compiled with the gcc 2.95.3 binutils.
Dave
--
David Spain
SiCortex, Inc.
Three Clock Tower Place, Suite 210
Maynard, MA USA 01754 Email: [EMAIL PROTECTED]
David Spain wrote:
I forgot to add the obligatory:
uclinux-2.4.32-uc0 from the 20060803 drop.
Compiled with the gcc 2.95.3 binutils.
page_alloc2.c is better for reducing fragmentation and also being less
sensitive to it, but it doesn't interact with kswapd's wakeup logic in
quite the way
On Wednesday 14 March 2007 7:35 pm, David McCullough wrote:
If you boot te hsystem is a configuration that doesn't use much RAM and
don't start and nasty big apps is the system idle (ie kswapd is
behaving). If so what triggers it's rampage ?
I'd noticed this too (page_alloc2() high CPU use)
Jivin Jamie Lokier lays it down ...
David McCullough wrote:
Feel free to send in some patches :-)
When they let me past the dark age of 2.4.26-uc0, maybe I will :-)
I have a few ideas to combine the better fragmentation performance of
page_alloc2.c with the speed of page_alloc.c (a
