Hello, Xen FAQ states that there''s a limitation of 3 virtual network interfaces per domU: http://wiki.xensource.com/xenwiki/XenFaq#head-9896478cf65a16f43ab4fb066f74c0e0d67a16ac My question is: is there any way (like setting some #define or something in the sources) to rise this limit to 4 or 5? Why is the limit set to 3 actually? I tried to google, but I couldn''t find any answer to my question and I''d really like to have 4 NICs in one of my domUs. greetings, -- Jan Srzednicki w@expro.pl _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Wed, Jun 28 ''06 at 14:29, Jan Srzednicki wrote:> Xen FAQ states that there''s a limitation of 3 virtual network interfaces > per domU: > ... > My question is: is there any way (like setting some #define or something > in the sources) to rise this limit to 4 or 5? Why is the limit set to 3 > actually?Not that I would know of. The problem is: the struct required for a virtual NIC is so big that only three instances fit into one page of memory. And extending the Xen interface to support more then one page of memory seams to require major surgery. In 3.0.0 days there were some attempts to write a patch, but that never worked out. IIRC it''s still on the ToDo list to allow more than 3 virtual nics, but there seams to be no presure. -- /"\ Goetz Bock at blacknet dot de -- secure mobile Linux everNETting \ / (c) 2006 Creative Commons, Attribution-ShareAlike 2.0 de X [ 1. Use descriptive subjects - 2. Edit a reply for brevity - ] / \ [ 3. Reply to the list - 4. Read the archive *before* you post ] _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Thu June 29 2006 07:21, Goetz Bock wrote:> On Wed, Jun 28 ''06 at 14:29, Jan Srzednicki wrote: > > Xen FAQ states that there''s a limitation of 3 virtual network > > interfaces per domU: > > ... > > My question is: is there any way (like setting some #define or > > something in the sources) to rise this limit to 4 or 5? Why is the > > limit set to 3 actually? > > Not that I would know of. > > The problem is: the struct required for a virtual NIC is so big that > only three instances fit into one page of memory. And extending the > Xen interface to support more then one page of memory seams to > require major surgery.Do alias interfaces eth0:1, etc. count in the limitation? jerry _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Thu, Jun 29 ''06 at 10:04, Jerry Amundson wrote:> On Thu June 29 2006 07:21, Goetz Bock wrote: > > On Wed, Jun 28 ''06 at 14:29, Jan Srzednicki wrote: > > > Xen FAQ states that there''s a limitation of 3 virtual network > > > interfaces per domU: > > Do alias interfaces eth0:1, etc. count in the limitation? > > jerryNo. Only Xen virtual ethernet interfaces. -- /"\ Goetz Bock at blacknet dot de -- secure mobile Linux everNETting \ / (c) 2006 Creative Commons, Attribution-ShareAlike 2.0 de X [ 1. Use descriptive subjects - 2. Edit a reply for brevity - ] / \ [ 3. Reply to the list - 4. Read the archive *before* you post ] _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users