Re: Very high load on P4 machines with 2.4.28

[Willy Tarreau <willy@w.ods.org>]

Hi,

On Tue, Jan 04, 2005 at 08:56:36PM +0100, Marek Habersack wrote:
(...) 
> equipped with 2.6Ghz P4 CPUs, 1Gb of ram, 2-4gb of swap, the kernel config
> is attached. The machines have normal load averages hovering not higher than
> 7.0, depending on the time of the day etc. Two of the machines run 2.4.25,
> one 2.4.27 and they work fine. When booted with 2.4.28, though (compiled
> with Debian's gcc 2.3.5, with p3 or p4 CPU selected in the config), the load
> is climbing very fast and hovers around a value 3-4 times higher than with
> the older kernels. Booted back in the old kernel, the load comes to its
> usual level. The logs suggest nothing, no errors, nothing unusual is
> happening. 
> 
> Has anyone had similar problems with 2.4.28 in an environment resembling the
> above? Could it be a problem with highmem i/o?
 
Never encountered yet ! Could you provide some indications about the type of
work (I/O, network, CPU, scripts execution, #of processes, etc...) ?

Regards,
Willy