Date: Thu, 13 Nov 2008 14:41:16 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hardware@freebsd.org Cc: freebsd-hackers@freebsd.org, "Ronnel P. Maglasang" <rmaglasang@infoweapons.com> Subject: Re: assigning interrupts Message-ID: <200811131441.16427.jhb@freebsd.org> In-Reply-To: <491BFB68.7050405@infoweapons.com> References: <491BFB68.7050405@infoweapons.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thursday 13 November 2008 05:03:20 am Ronnel P. Maglasang wrote: > Hi All, > > Is there a way to explicitly assign an interrupt > of a device? I'm running on 6.3 and the two NICs > share the same interrupt. Obviously this will affect > the performance if the NICs are exposed to heavy network > traffic. > > # vmstat -i > interrupt total rate > <sniff> > irq11: em0 vr0+ 1081099 77 > <sniff> > Total 16958562 1222 > > > Looking at the driver's code, I have the initial though > that this is the place where I can modify. > > -- > adapter->res_interrupt = bus_alloc_resource_any(dev, > SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE); > -- > > I've tried changing RF_SHAREABLE to RF_ALLOCATED or other > values but still could not get the desired result and worst > the device fail to initialize. Is this possible in 6.3? You can not easily assign them, no. In many cases the interrupt pins from the devices may be hardwired to a single input pin on an interrupt controller. In that case there is nothing you can do. You can read more about the gory details here: http://people.freebsd.org/~jhb/papers/bsdcan/2007/ -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200811131441.16427.jhb>