Re: [Bug #14141] order 2 page allocation failures (generic)

[Mel Gorman <mel@csn.ul.ie>]

On Tue, Oct 20, 2009 at 01:44:50PM +0200, Tobias Oetiker wrote:
> Hi Mel,
> 
> Today Mel Gorman wrote:
> 
> > On Mon, Oct 19, 2009 at 10:17:06PM +0200, Tobias Oetiker wrote:
> 
> > > Oct 19 22:09:52 johan kernel: [11157.121600]  [<ffffffff813ebd42>] skb_copy+0x32/0xa0 [kern.warning]
> > > Oct 19 22:09:52 johan kernel: [11157.121615]  [<ffffffffa07dd33c>] vboxNetFltLinuxPacketHandler+0x5c/0xd0 [vboxnetflt] [kern.warning]
> > > Oct 19 22:09:52 johan kernel: [11157.121620]  [<ffffffff813f2512>] dev_hard_start_xmit+0x142/0x320 [kern.warning]
> >
> > Are the number of failures at least reduced or are they occuring at the
> > same rate?
> 
> not that it would have any statistical significance, but I had 5
> failure (clusters) yesterday morning and 5 this morning ...
> 

Before the patches were applied, how many failures were you seeing in
the morning?

> the failures often show up in groups I saved one on
> http://tobi.oetiker.ch/cluster-2009-10-20-08-31.txt
> 
> > Also, what was the last kernel that worked for you with this
> > configuration?
> 
> that would be 2.6.24 ... I have not upgraded in quite some time.
> But since the io performance of 2.6.31 is about double in my tests
> I thought it would be a good thing todo ...
> 

That significant a different in performance may explain differences in timing
as well. i.e. the allocator is being put under more pressure now than it
was previously as more processes make forward progress.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

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