Hello, I''ve recently installed Xen 3.2 on my system (Ubuntu 8.04 Hardy LTS) and for testing purpose I''ve created a Windows (Windows XP SP2) domain. In this domain, when I make benchmarks (like SuperPi or Sisoft Sandra Lite) the domain is used at 100%. But, when I launch a top on my dm0 the most busied processus is qemu-dm with 1,5% of CPU. Benchmarks results are very poors ... I''ve tried to increase vcpu, cap and weight parameters on my dmU but nothing chances. Is there a way to configure my domain in order to permit him to be more performant ? Ps : Sorry for my bad english :-/ Thank you -- \o/ Poulpatine \o/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Poulpatine <poulpatine@gmail.com> writes:> I''ve recently installed Xen 3.2 on my system (Ubuntu 8.04 Hardy LTS) > and for testing purpose I''ve created a Windows (Windows XP SP2) > domain. In this domain, when I make benchmarks (like SuperPi or Sisoft > Sandra Lite) the domain is used at 100%. But, when I launch a top on > my dm0 the most busied processus is qemu-dm with 1,5% of CPU. > Benchmarks results are very poors ......> Is there a way to configure my domain in order to permit him to be > more performant ?HVM has slow I/O. if you install the paravirtualized drivers for the guest OS that should help a whole lot. The thing is, without paravirtualized drivers, you are essentially using qemu to emulate a scsi or ide card for all your I/O, which is not particularly quick. you can play about with James Harper''s (beta, I think) gplpv paravirt drivers for windows: http://www.meadowcourt.org/downloads those are the only paravirt windows drivers that I know of that are free. You can pay money to citrix or suse and get paravirt windows drivers. without paravirt drivers in the DomU, you are unlikely to achieve anything like good I/O performance in HVM mode. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Actually, my question was most about CPU performances than I/O perfs but thank you for your response. 2008/10/15 Luke S Crawford <lsc@prgmr.com>:> Poulpatine <poulpatine@gmail.com> writes: >> I''ve recently installed Xen 3.2 on my system (Ubuntu 8.04 Hardy LTS) >> and for testing purpose I''ve created a Windows (Windows XP SP2) >> domain. In this domain, when I make benchmarks (like SuperPi or Sisoft >> Sandra Lite) the domain is used at 100%. But, when I launch a top on >> my dm0 the most busied processus is qemu-dm with 1,5% of CPU. >> Benchmarks results are very poors ... > ... > >> Is there a way to configure my domain in order to permit him to be >> more performant ? > > HVM has slow I/O. if you install the paravirtualized drivers for the guest OS > that should help a whole lot. > > The thing is, without paravirtualized drivers, you are essentially using qemu > to emulate a scsi or ide card for all your I/O, which is not particularly > quick. > > you can play about with James Harper''s (beta, I think) gplpv paravirt > drivers for windows: > > http://www.meadowcourt.org/downloads > > those are the only paravirt windows drivers that I know of that are free. > You can pay money to citrix or suse and get paravirt windows drivers. > > > without paravirt drivers in the DomU, you are unlikely to achieve anything like > good I/O performance in HVM mode. >-- \o/ Poulpatine \o/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users