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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