Poor network performance in 5.4 AMD64 Snap 8 with SMP support

Roger Skjetlein rskjetlein at atmel.com
Sun Oct 16 14:56:10 PDT 2005

I did try it, same problem occured. It disappered when I disabled 
hyperthreading in bios.

6.0- beta 5 and rc1 works fine with all features enabled.

Robert Watson wrote:
> On Sat, 8 Oct 2005, Roger Skjetlein wrote:
>> 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?
> Is it possible for you to test using an i386 install rather than an 
> amd64 install, for reference?  I use Xeon SMP test hardware in the 
> netperf cluster, and have no problem saturating multiple gigabit 
> ethernet links with either UP or SMP kernels.  However, all the Xeons I 
> have access to are 32-bit CPUs.
> Robert N M Watson
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