Shepherd, Darren S
2006-Oct-05 16:33 UTC
[Xen-users] Smallest Memory requirements for Dom0
All, Has anybody tried to get Dom0 memory footprint as small as possible. I was thinking of building a cluster of PC''s (I have 20 or so P4 2.4Ghz 1GB RAM machines sitting around) that would be dedicated to Xen. I typically run each DomU with 1GB memory. I was hoping I could get Dom0 down to maybe 64Mb? Has anybody tried this. Would there be any performance impact? I plan on doing absolutely nothing in Dom0, solely run Xen. Darren _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
If you are sparse on dom-0, and don''t have too many bridges or firewall / NAT rules going on it should be fine. More than 3 or 4 bridges and you may see some issues at that size. I did the same with a xen 2 / open ssi lab cluster and it worked very well. Steer clear of iscsi if you''re only giving dom-0 64 MB, if you plan on doing any distributed / network block devices. HTH -Tim On Thu, 2006-10-05 at 12:33 -0400, Shepherd, Darren S wrote:> All, > > Has anybody tried to get Dom0 memory footprint as small as possible. I was thinking of building a cluster of PC''s (I have 20 or so P4 2.4Ghz 1GB RAM machines sitting around) that would be dedicated to Xen. I typically run each DomU with 1GB memory. I was hoping I could get Dom0 down to maybe 64Mb? Has anybody tried this. Would there be any performance impact? I plan on doing absolutely nothing in Dom0, solely run Xen. > > Darren > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
So what''s the rule of thumb for dom0 memory and bridges. If I have 6 domU,how much memory should I use. Is it also dependent on traffic? Thanks, Greg Tim Post wrote:> If you are sparse on dom-0, and don''t have too many bridges or > firewall / NAT rules going on it should be fine. More than 3 or 4 > bridges and you may see some issues at that size. > > I did the same with a xen 2 / open ssi lab cluster and it worked very > well. > > Steer clear of iscsi if you''re only giving dom-0 64 MB, if you plan on > doing any distributed / network block devices. > > HTH > -Tim > > On Thu, 2006-10-05 at 12:33 -0400, Shepherd, Darren S wrote: > >> All, >> >> Has anybody tried to get Dom0 memory footprint as small as possible. I was thinking of building a cluster of PC''s (I have 20 or so P4 2.4Ghz 1GB RAM machines sitting around) that would be dedicated to Xen. I typically run each DomU with 1GB memory. I was hoping I could get Dom0 down to maybe 64Mb? Has anybody tried this. Would there be any performance impact? I plan on doing absolutely nothing in Dom0, solely run Xen. >> >> Darren >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> >> >> > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users