Hello all, I have been testing a Windows 2008 server on xen 3.2-1 (from debian backports) on etch and I got very bad perf with GPLPV drivers with disks (I can''t get more than 3/5 Mo/s). I am quite sure that I have drivers enabled because device manager show them and report them as working correctly. The difference between a normal installation and my Xen one is that I do not have access to write caching optimization (the option "Enable write caching on the disk" is not present at all). Is there something I should do ? I am running 0.9.11pre17 GPLPV drivers. Cheers. Matthieu. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
> Hello all, > > I have been testing a Windows 2008 server on xen 3.2-1 (from debian > backports) on etch and I got very bad perf with GPLPV drivers withdisks> (I can''t get more than 3/5 Mo/s). > > I am quite sure that I have drivers enabled because device managershow> them and report them as working correctly. > The difference between a normal installation and my Xen one is that Ido> not have access to write caching optimization (the option "Enablewrite> caching on the disk" is not present at all).The ''write caching'' is presumably Windows responding to a feature reported by the disk. As my drivers don''t cache anything anyway, even if I reported it as available it wouldn''t actually do anything.> > Is there something I should do ? > I am running 0.9.11pre17 GPLPV drivers.Can you tell me how you are measuring performance? Thanks James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I retransmit on the list because I forgot to ... On 10.10.2008 03:16, James Harper wrote:>> Hello all, >> >> I have been testing a Windows 2008 server on xen 3.2-1 (from debian >> backports) on etch and I got very bad perf with GPLPV drivers with > disks >> (I can''t get more than 3/5 Mo/s). >> >> I am quite sure that I have drivers enabled because device manager > show >> them and report them as working correctly. >> The difference between a normal installation and my Xen one is that I > do >> not have access to write caching optimization (the option "Enable > write >> caching on the disk" is not present at all). > > The ''write caching'' is presumably Windows responding to a feature > reported by the disk. As my drivers don''t cache anything anyway, even if > I reported it as available it wouldn''t actually do anything. > >> Is there something I should do ? >> I am running 0.9.11pre17 GPLPV drivers. > > Can you tell me how you are measuring performance? >With iozone, in fact it''s more 6/7Mo but still it''s not gorgeous, I was able to check the result with the ressource monitor and with iostat (running in dom0 while iozone was running). Cheers. Matthieu _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users