Nicholas Lee
2006-Feb-22 19:09 UTC
Was simple performance stats between Xen 2.0 and 3.0 (was Re: [Xen-users] Xen, NFS performance, rsize, wsize and MTU)
On 23/02/06, Chris Fanning <christopher.fanning@gmail.com> wrote:> I was trying to set up home accounts on a domU. > I''ve tested what you said about homes on domU and guess what, you''re right > :) > > I''m going to set them up on dom0 (or somewhere else).I''ve got two machines in a colo now with Xen. Now I''ve sort out my bridging problem I can do a bit of simple testing. Its a reasonable difference.>From x335 domU (running 2.0) to v20z (running 3.0):[nic@shell:~] scp Atiz_1606_CNNH.mpg wuwei: # host0 on v20z Atiz_1606_CNNH.mpg 100% 42MB 10.5MB/s 00:04 [nic@shell:~] scp Atiz_1606_CNNH.mpg svn: #domU on v20z Atiz_1606_CNNH.mpg 100% 42MB 4.7MB/s 00:09 [nic@shell:~] scp Atiz_1606_CNNH.mpg stateless: # host0 on x335 Atiz_1606_CNNH.mpg 100% 42MB 14.0MB/s 00:03 [nic@shell:~] scp Atiz_1606_CNNH.mpg flavour: # domU on x335 Atiz_1606_CNNH.mpg 100% 42MB 1.5MB/s 00:28 However, looks like 3.0 to 3.0 is much better. nic@svn:~$ scp Atiz_1606_CNNH.mpg wuwei: # host0 from domU on v20z Atiz_1606_CNNH.mpg 100% 42MB 42.0MB/s 00:01 nic@svn:~$ scp Atiz_1606_CNNH.mpg rails: # domU from domU on v20z Atiz_1606_CNNH.mpg 100% 42MB 14.0MB/s 00:03 Still there is a large difference between dom0 to domU and domU to domU and obviously a domU in Xen 2.0 is not able to handle supplying other domUs on the same host0 effectively. -- Nicholas Lee http://stateless.geek.nz gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Ernst Bachmann
2006-Feb-22 20:36 UTC
Re: Was simple performance stats between Xen 2.0 and 3.0 (was Re: [Xen-users] Xen, NFS performance, rsize, wsize and MTU)
On Wednesday 22 February 2006 20:09, Nicholas Lee wrote:> On 23/02/06, Chris Fanning <christopher.fanning@gmail.com> wrote: > > I was trying to set up home accounts on a domU. > > I''ve tested what you said about homes on domU and guess what, you''re > > right > > > > :) > > > > I''m going to set them up on dom0 (or somewhere else). > > I''ve got two machines in a colo now with Xen. Now I''ve sort out my bridging > problem I can do a bit of simple testing. Its a reasonable difference. > > >From x335 domU (running 2.0) to v20z (running 3.0):[...]> > Still there is a large difference between dom0 to domU and domU to domU and > obviously a domU in Xen 2.0 is not able to handle supplying other domUs on > the same host0 effectively.How were the VCPUs distributed among the domains? all domains running on single-CPU or hyperthreading or SMP? If you have SMP/HT available, maybe try to dedicate one thread/core to dom0 exclusively, otherwise for each IO operation xen has to switch context between them. /Ernst _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users