Date: Sun, 16 Oct 2005 21:59:53 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Roger Skjetlein <rogers@netrunner.nu> Cc: freebsd-smp@freebsd.org Subject: Re: Poor network performance in 5.4 AMD64 Snap 8 with SMP support Message-ID: <20051016215759.S66014@fledge.watson.org> In-Reply-To: <20051008011047.T58661@netrunner.nu> References: <20051008011047.T58661@netrunner.nu>
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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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