Hello, I have xen dom0 running on Debian with a RedHat 5.4 domU. (under HVM) Its working, but performance is crappy. I think I need to get PV drivers in the RH kernel, or flip this to a PV domU? The RH kernel is 2.6.18, which doesn''t come stock with PV drivers. Any suggestions on how to get his domU up to snuff? Thanks! _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
Mike, I think you need to better categorize the statement "performance is crappy." Dig into the performance some and figure out where your bottleneck is - disk, network, CPU, memory?? The standard tools you''d use on a physical machine should work fine on a VM - iostat, vmstat, top, free, sar, etc., etc. Once you nail down where the problem is, you can post back and folks will probably have some better suggestions on how to alleviate specific bottlenecks. Also, let us know what you''re doing with the VM. Running a basic web server? Oracle database server? Compiling code? The tuning will be very different based on where the bottleneck is and what you''re trying to do with the system. -Nick>>> On 2013/02/07 at 09:21, "Mike Egglestone" <mike@estone.ca> wrote: > Hello, > > I have xen dom0 running on Debian with a RedHat 5.4 domU. (under HVM) > Its working, but performance is crappy. > > I think I need to get PV drivers in the RH kernel, or flip this to a PV > domU? > The RH kernel is 2.6.18, which doesn''t come stock with PV drivers. > > Any suggestions on how to get his domU up to snuff? > > Thanks!-------- This e-mail may contain confidential and privileged material for the sole use of the intended recipient. If this email is not intended for you, or you are not responsible for the delivery of this message to the intended recipient, please note that this message may contain SEAKR Engineering (SEAKR) Privileged/Proprietary Information. In such a case, you are strictly prohibited from downloading, photocopying, distributing or otherwise using this message, its contents or attachments in any way. If you have received this message in error, please notify us immediately by replying to this e-mail and delete the message from your mailbox. Information contained in this message that does not relate to the business of SEAKR is neither endorsed by nor attributable to SEAKR.
"Nick Couchman" <Nick.Couchman@seakr.com> writes: #I think you need to better categorize the statement "performance is crappy." Dig into the performance some and figure out where your bottleneck is - disk, network, CPU, memory?? The standard tools you''d use on a physical machine should work fine on a VM - iostat, vmstat, top, free, sar, etc., etc. Once you nail down where the problem is, you can post back and folks will probably have some better suggestions on how to alleviate specific bottlenecks. Also, let us know what you''re doing with #the VM. Running a basic web server? Oracle database server? Compiling code? The tuning will be very different based on where the bottleneck is and what you''re trying to do with the system. Sorry, should have been more specific in my OP. Redhat DomU: The network speed at best is around 17MB/sec. And the disk IO is around 140MB/sec (running dd command to create a zero''d file) The DomO network is speed is normal gigabit at around 80MB/sec and the disk IO is around 400+MB/sec. (8 disk RAID 10) My other DomU''s such as an hvm Windows 2008 R2 server, and my hvm Debian 6.0 DomU all have normal benchmarks for a typical domU. Both Windows and Debian DomU using PV drivers. Disk Speeds around 230MB/sec and network IO around 70MB/sec Its just this one redhat domU thats not performing well. I''m blaming the old kernel on it. (2.6.18) so perhaps no PV drivers in that kernel. This redhat server will mostly be a frontend webserver fetching data from a database on another different physical server. So, maybe this VM is fine the way it is. I mostly concerned about disk IO and network speed. The network speed and disk IO is considerably slower than my Debian domU. I guess its not that bad after all, but just curious if I can get the full speed out of the redhat kernel. By either installing PVHVM drivers into the redhat kernel, or making the DomU a PV guest. I''ve been trying to follow the guidelines here: http://wiki.xen.org/wiki/Xen_Linux_PV_on_HVM_drivers#Using_Xen_PVHVM_drivers_with_Ubuntu_HVM_guests Thanks, Mike _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users