[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Why two netback drivers? (netback/0 and netback/1)
On Sun, Nov 14, 2010 at 11:02 AM, Blazej Adamczyk <blazej.adamczyk@xxxxxxxxx> wrote: > Hello everyone, > > > > I was looking at Xen networking IO architecture and I really don’t > understand one thing. On Dom0 right after booting up there are two netback > kernel threads (netback/0 and netback/1). As I have noticed, they both share > the tasks related with scheduling the traffic for all DomUs. Having two > guest domains assigns each netback to a single domain (from my > observations). But having more guest domains makes them share these two > processes. > > > > Can anyone tell me why there are exactly two netback processes? What part of > the Xen code is responsible for creating them and if I can change > configuration to have more of them? My guess is that for performance reasons, multiple threads are used. I think that if you are really trying to get a better sense of how it is working internally and how it can be tweaked, then the xen-devel list would be a better place to discuss such issues. Hope that helps. Thanks, Todd > > > > There are also loop0, loop1.. processes but they are created for each DomU > created and as I can guess they are responsible for connecting eth0 > interface with vif interfaces. > > > > The reason I ask this question is that I was wondering if I can set > priorities on each DomU network IO operations by changing the scheduling > policy on the driver domain. > > > > My configuration is simple: > > Domain 0 is also the driver domain. The netback drivers are compiled into > the kernel. I use Linux Gentoo and Xen 4.0. > > > > Thanks in advance for any help and comments. > > > > Best regards, > > Blazej > > _______________________________________________ > Xen-users mailing list > Xen-users@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-users > -- Todd Deshane http://todddeshane.net http://runningxen.com _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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