Poor network performance in 5.4 AMD64 Snap 8 with SMP support

Roger Skjetlein rogers at netrunner.nu
Mon Oct 10 05:40:36 PDT 2005

Is this really not an aknowledged problem? I have seen several postings on 
internet regarding this, this should be considered as a severe bug.

I have also done some testing on 5.4/Sparc64 and it actually I think I can 
replicate the same behaviour there with SMP kernel.

On Sat, 8 Oct 2005, Roger Skjetlein wrote:

> Hi,
> I have a server with a Supermikro mainboard and two Xeon 3.0Ghz/2MB. When 
> running kernel with SMP support the network performance is very poor, this is 
> very visible on NFS traffic. When running UP kernel the performance is as 
> espected and very good.
> I have tried some different GB nics and the problems is static and 
> independent of modell/brand.
> I have also disabled as much as hardware possible, no usb, sio and etc.
> Typical indicator is also that the load on the box is skyrocketing when it 
> starts to serve nfs client, but the cpu load is very load.
> Is there any way around this problem?
> Regards,
> RS

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