Hello again everybody! I got a question about the domU''s ethernet speed. When I use ethtool (debian) I don''t get any speed information. Is the ethernet card for the domU''s 100mbit or 1000mbit? If it''s 100mbit, is it possible to get it to 1000mbit? Thanks! - Simon _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Wed, Aug 20, 2008 at 2:45 PM, Simon Gottschlag <simon@gottschlag.se> wrote:> Hello again everybody! > I got a question about the domU''s ethernet speed. > When I use ethtool (debian) I don''t get any speed information. > Is the ethernet card for the domU''s 100mbit or 1000mbit? If it''s 100mbit, is > it possible to get it to 1000mbit?what''s the speed of a pipe? the ethernet virtual interfaces are software-implemented, so it doesn''t make sense to set the speed to any fixed value. they''re as fast as the CPU can copy the data around -- Javier _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
So it just depends on the physical card? It''s just that I''ve been experiencing that it takes longer time to load rar-archives etc via samba and transferring files from my server now when it''s a virtual machine. It''s still the same hardware, just that I''ve made it into a domU. Is this just something in my head or is it really going slower? - Simon On Wed, Aug 20, 2008 at 9:49 PM, Javier Guerra <javier@guerrag.com> wrote:> On Wed, Aug 20, 2008 at 2:45 PM, Simon Gottschlag <simon@gottschlag.se> > wrote: > > Hello again everybody! > > I got a question about the domU''s ethernet speed. > > When I use ethtool (debian) I don''t get any speed information. > > Is the ethernet card for the domU''s 100mbit or 1000mbit? If it''s 100mbit, > is > > it possible to get it to 1000mbit? > > what''s the speed of a pipe? > > the ethernet virtual interfaces are software-implemented, so it > doesn''t make sense to set the speed to any fixed value. they''re as > fast as the CPU can copy the data around > > -- > Javier >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Wed, Aug 20, 2008 at 3:34 PM, Simon Gottschlag <simon@gottschlag.se> wrote:> So it just depends on the physical card?no, it''s totally detached from the card. what the DomU sees and the hypervisor manages goes only to the Dom0. there usually it''s routed/NAT''ed/bridged to some physical card, but that''s not DomU''s business.> It''s just that I''ve been experiencing that it takes longer time to load > rar-archives etc via samba and transferring files from my server now when > it''s a virtual machine. It''s still the same hardware, just that I''ve made it > into a domU. > Is this just something in my head or is it really going slower?usually virtual machines are slower than bare metal. how much slower depends on lots of factors. (maybe 5% slower, maybe 400% or more) -- Javier _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
You can try to use unmodified_drivers (ie Paravirtual drivers) on your guest kernel. That will give much better performance compared to an emulated NIC. Emre On Wed, Aug 20, 2008 at 10:44 PM, Javier Guerra <javier@guerrag.com> wrote:> On Wed, Aug 20, 2008 at 3:34 PM, Simon Gottschlag <simon@gottschlag.se> > wrote: > > So it just depends on the physical card? > > no, it''s totally detached from the card. > > what the DomU sees and the hypervisor manages goes only to the Dom0. > there usually it''s routed/NAT''ed/bridged to some physical card, but > that''s not DomU''s business. > > > It''s just that I''ve been experiencing that it takes longer time to load > > rar-archives etc via samba and transferring files from my server now when > > it''s a virtual machine. It''s still the same hardware, just that I''ve made > it > > into a domU. > > Is this just something in my head or is it really going slower? > > usually virtual machines are slower than bare metal. how much slower > depends on lots of factors. (maybe 5% slower, maybe 400% or more) > > -- > Javier > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >-- Emre _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users