[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] PCI passthrough issue
Le 01/02/2011 16:38, Ian Campbell a Ãcrit : > On Tue, 2011-02-01 at 15:14 +0000, Jean Baptiste Favre wrote: > > Le 01/02/2011 15:18, Ian Campbell a Ãcrit : > > >> Assuming the driver is modular: > >> "modprobe sky2 copybreak=<N>" > >> > >> Depending on your distro there will be somewhere in /etc you can add > >> this. e.g. on Debian you can create a file in /etc/modprobe.d/ > >> containing "option sky copybreak=<N>" other distros > >> use /etc/modprobe.conf etc. > > OK I see but it doesn't seems to have any effect. > > I tried "option sky copybreak=0" to get all packet copied with no > change. > > The driver is called sky2 not sky so this won't have done anything. I > typo'd it above, sorry. My bad, I fixed your typo during tests, but I just copied it while writing the mail. So basically, using: # cat /etc/modprobe.d/sky2.conf option sky2 copybreak=0 does not help. I have to remove module and load it with right option. BTW it's not a real issue for me, I can add it in init script :) > > But I have to say that I'm a bit confused: as I run a PV domU, kernel > > and initrd are provided by dom0. > > So basically, I had no module related binaries installed. After > > installation, I tried to remove module and reload it with different > > configuration without changes. > > Is there any way to provide this sort of option in kernel commandline so > > that it 'll be taken into account even in initrd ? > > It depends on your distro and/or initrd tool, I don't know a generic > answer. Both are Debian ones. I've tried to compile kernel from Jeremy's git repo, but face some problems: it's been a long time since my last kernel compilation and I did not find all configuration options I need :-/ > If the driver is statically compiled and not modular at all you can do > <module>.<param>=<value> on the kernel command line, e.g. > "sky2.copybreak=256". I may use this way because, as a firewall, I prefer using static kernels :) > There doesn't appear to be any way to find out what copybreak the driver > actually uses, short of hacking something into the driver itself. e.g. > > diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c > index 7d85a38..786b8c6 100644 > --- a/drivers/net/sky2.c > +++ b/drivers/net/sky2.c > @@ -87,7 +87,7 @@ module_param(debug, int, 0); > MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); > > static int copybreak __read_mostly = 128; > -module_param(copybreak, int, 0); > +module_param(copybreak, int, 0444); > MODULE_PARM_DESC(copybreak, "Receive copy threshold"); > > static int disable_msi = 0; > > Allow you to see the current active value > in /sys/module/sky2/parameters/copybreak. If you are going to do that > you might as well just change the constant above though ;-) Will try this as well Regards, JB _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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