Re: High TLB shootdown I interrupts with wm gigabit NIC?

[Mark Cullen <mark.r.cullen%gmail.com@localhost>]

Matthias Scheler wrote:
> On Wed, Jul 30, 2008 at 06:42:30PM +0100, Mark Cullen wrote:
> > (markie@homeserver:ttyp0)-(~)$ uname -a
> > NetBSD homeserver.bone.servebeer.com 4.0_STABLE NetBSD 4.0_STABLE 
> > (HOMESERVER.MP) #2: Sat Jul 12 14:54:54 BST 2008 
> > markie%homeserver.bone.servebeer.com@localhost:/usr/obj/sys/arch/amd64/compile/HOMESERVER.MP 
> > amd64
>
> NetBSD 4.0's kernel doesn't have very scalable SMP support. The high
> number of TLB shootdowns is probably a side effect of that.
>
> The good news is that SMP scalability has been improved a lot in
> NetBSD-current, mostly because of Andy Doran's work.
>
>         Kind regards

Would this have anything to do with it hitting a brick wall at 30MB/s? I 
don't even know what this TLB shootdown thing is, I just though may be 
it would be related to the "slow" speeds I am seeing.

It could just be the limit of the disks I suppose, though I thought they 
were good to about 50MB/s.

I'm not comfortable running -current really. I'd like to have it just 
sit there and work for another few years, as with the previous hardware 
/ install (3.1) :)

--
Mark Cullen <mark.r.cullen%gmail.com@localhost>