Re: E1000 - page allocation failure - saga continues :(

[Nick Piggin]

On Tue, 2005-04-19 at 10:15 +0200, Yann Dupont wrote:
> Nick Piggin a Ãcrit :
> 
> >
> >>Do you have turned NAPI on ??? I tried without it off on e1000 and ...
> >>surprise !
> >>Don't have any messages since 12H now (usually I got those in less than 1H)
> >>
> >>    
> >>
> >
> >Possibly kswapd might be unable to get enough CPU to free memory.
> >
> >  
> >
> Ok, so what you're saying is that turning NAPI off is just slowing down
> things enough to not be hit by
> this problem , right ?
> 

Perhaps, yes. Or that NAPI is using more CPU than non-NAPI
(which I understand can happen in some corner cases).

If you have a multiprocessor (or even hyperthreading), I
think you could test this by binding kswapd on cpu CPU, and
put nic interrupts on the other - then test with and without
NAPI.

That is, presuming you can reproduce the problem on your
multiprocessor system in the first place.


-- 
SUSE Labs, Novell Inc.


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